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Location:
Madrid - Spain
Registered:
August 2002
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G, F and T series Diffs
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Fri, 16 May 2003 01:02
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Anyone know the difference between axle diameters and spline types with these diffs. I am looking at an upgrade and the F series is looking like coming up trumps so far.
Have any of you Supra / Corona guys had any problems with the F series diff once you put a bit of power through them???
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Fri, 16 May 2003 02:03
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My F diff is holding up OK behind the 2JZ-GTE. It's a bit noisy but I think that's just because it's old. I plan to keep the F diff for now (I'll throw a TrueTrac centre in when I can afford it though), and I doubt I'll upgrade to anything bigger unless I really need to (ie start snapping diffs/axles).
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Location:
adelaide
Registered:
May 2002
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Re: G, F and T series Diffs
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Sun, 18 May 2003 05:42
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F series diffs are the ones out of the rare MA40/5 celica/supra jap model arent they?? were these ever properly released in aus?
What other vehicles did these diffs come from? are they a reletively straight-forward swapover for old celicas, ie would you be bolting in the whole rear axle setup hub to hub?
or are they more suitable to go in old supras and the like?
Just out of curiousity again, what series diffs are in the old hiluxs?
_________________
BlackRA28
18rgeu
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Location:
c'town, NSW
Registered:
May 2002
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Re: G, F and T series Diffs
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Sun, 18 May 2003 08:27
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live axle F's that were released in aus was the MX10 corona. they are single spinner and drum brakes.
the MA46 and RA45 F series disc brake rear end is VERY rare..
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: G, F and T series Diffs
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Sun, 18 May 2003 09:26
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| blackRA28 wrote on Sun, 18 May 2003 15:42 |
Just out of curiousity again, what series diffs are in the old hiluxs?
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G series.
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Location:
nowra
Registered:
March 2003
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Re: G, F and T series Diffs
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Sun, 18 May 2003 10:08
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i have a file on my computer of how to read the diff and gearbox codes in toyotas if anyone wants it. i dont think it on what you want at the moment
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Sun, 18 May 2003 21:42
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As far as I know, the F series came in live axle in the late model corona's, RT141 etc. They are also in the MA61 and MA70 supras and in 4runners.
The Hiluxs have as far as I know G series diffs. I think also the JZA80 supras have a G series with a schmick Torsen type centre 
No diff swap is easy in an early celica. An F series from a corona is still about 1.5in wider than the standard diff, but comes with the right stud pattern, disk brakes and is a fair bit stronger than the T series diff in the early celicas. The LSD from the MA supras and 4runners should bolt in too.
Anyone know anything about the axles in an F series, I am trying to figure out how much stronger they are and if I am better off spending more and going for a G series.
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Location:
c'town, NSW
Registered:
May 2002
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Re: G, F and T series Diffs
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Sun, 18 May 2003 21:50
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| gold28 wrote on Mon, 19 May 2003 07:42 |
As far as I know, the F series came in live axle in the late model corona's, RT141 etc. They are also in the MA61 and MA70 supras and in 4runners.
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the MA61 is IRS F series and the MA70 had the G series diff, the JZA70 had the torsen G series
| gold28 wrote on Mon, 19 May 2003 07:42 |
The Hiluxs have as far as I know G series diffs. I think also the JZA80 supras have a G series with a schmick Torsen type centre
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and the JZA80 dont have G series they have something else (i think the designation is A) but yes it is a torsen unit.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Sun, 18 May 2003 22:11
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Yeah I know the MA61 supra had an IRS, I was just looking at the LSD with appropriate gear ratio's.
I didn't know the MA70's had a G series. That might make the G series a little more doable if I could get a hold of one of these centres.
Just weighing up my options at the moment. The G series looks good but a lot of mucking around. If I can get an F series package together, I thiink it would be a fair bit cheaper and plenty strong enough for a little 1G.
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Location:
NSW
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 19 May 2003 06:10
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I think Toyota had change their Tran/Axle code, G series now as a "A" series (look at the new Hilux, I sure they have G series diff).
The F series axle is 28.08mm, 27 spline.
Leon
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 19 May 2003 11:10
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I saw a ST141 Corona the other day with rear discs... does anyone know what sort of diff they come with? I know some have a BW diff but I'm pretty sure they come with drums only. If it's an F diff I reckon this would be a good upgrade for a Celica... it has disc brakes, the right stud pattern, and it's probably close to the same width!
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Mon, 19 May 2003 21:52
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Thats exactly what I was thinking, they are about 1.5in wider than the RA28 diff, but stronger, have discs standard and the centres and ratio's arn't hard to come by.
Sounds heaps cheaper than a G series. I don't think my little 1G is gonna bust one of these.
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Location:
c'town, NSW
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 19 May 2003 22:13
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our old mate allan who used to grace the forums tells me these (or a similar model) discs will bolt straight up to a T seires rear end as well... ill ask him again when i talk to him tonight
would be nice to see if they bolt up to a MX10 rear end as well.
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Wed, 16 July 2003 04:25
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| Norbie wrote on Mon, 19 May 2003 21:10 |
I saw a ST141 Corona the other day with rear discs... does anyone know what sort of diff they come with?
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I thought the Corona Avante came with rear discs, not sure on the diff model tho.
Cheers
Wilbo
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Location:
Terrigal
Registered:
May 2002
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Re: G, F and T series Diffs
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Wed, 16 July 2003 04:33
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I have a complete G series diff at home. I'm going to start pulling it apart soon so if you want me to take any measurements just let me know. Such as axles etc.. Or better still jump on the old road for some fun and head up the coast one weekend 
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: G, F and T series Diffs
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Wed, 16 July 2003 04:50
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advante has IRS so wouldnt easyily bolt onto anything
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Location:
Mackay, Nth Queensland
Registered:
June 2002
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Re: G, F and T series Diffs
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Wed, 16 July 2003 06:22
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I've got an st141 corona '84, its a csx model with twin headlights, power steering and bigger bars. it also has rear discs which i only found out like a month ago after having the car for 3 years!! even the mechanic was suprised!
yeah norbie its a borg warner diff but not sure if its an F series type (can't quite read the numbers on the underside). i want to put an lsd center in it - the stock diff won't last long behind a worked 18rg!! i'm just not sure if it will fit though. has anyone done this conversion before?
regards,
jarrod
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Location:
Melbourne
Registered:
August 2002
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Re: G, F and T series Diffs
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Wed, 16 July 2003 06:52
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I think you will find that it's a T series.
It will be listed on the compliance plate.
Was looking at using one in an AE86.
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Location:
Canberra
Registered:
May 2002
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Registered:
March 2003
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Location:
Melbourne
Registered:
May 2002
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Re: G, F and T series Diffs
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Wed, 16 July 2003 10:16
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G series diffs are of ga ma jza series hilux and hiace, they are a 30 spline diff with and 8 inch wheel. Supposed to be pretty strong, nearly as strong as a nine incher so i am told by a few of the specialists.
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Location:
Kenthurst, Sydney
Registered:
February 2003
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Re: G, F and T series Diffs
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Wed, 16 July 2003 23:56
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F series diffs came in live axle and with disc brakes in the MS112 series Crowns.
I have shattered one doing a reasonably hard change into second gear. But the Crown has a bit more weight than you guys cars so it might not be a problem for you.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Fri, 18 July 2003 03:44
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So how does this sound??
A Mk2 Corona diff is about the right width, The MA61 LSD centre or 4runner aftermarket centre will bolt in.
Crown discs will fit an F series but they are 5 stud are they not???
The corona discs are on the BW diffs only??? or were they fitted to the tojo F series?? I guess you might even be able to get away with skyline disc/rotor with appropriatly modified adapter plates, but it would be nice if they all bolted together.
OR
G Series Hilux and find a MA/JZA 70 centre and either live with 5 stud drums or stuff around converting to 4 stud and/or discs.
I am still thinking that for a few hundred horsies the corona diff should be fine. I don't plan on bolting up a pair of slicks and doing a 7000rpm launch...... well not in the near future anyway.
I guess it is just a matter of finding the fight components and doing it.
As far as axle strength is concerned, the torsional strength is proportional to R^3 meaning that for a 25%increase in radius/diameter of the axle, it will be approximatly twice as strong. If Dylo thinks the F series is 7mm thicker than the T series, by memory, the T series axle is about 20-25 mm thick, therefore the F series should be more than twice as strong.
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Fri, 18 July 2003 04:33
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I can't comment on F series live axles, but the F series centre should be plenty strong enough for your needs. I haven't broken mine yet with 400hp in a 1300kg car! Lots of people have put 7M's and 1JZ's in MA61's with no diff problems, so they can obviously handle a lot of power. I wouldn't bother with a G series unless you're building a drag car.
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Location:
Melbourne
Registered:
May 2002
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Re: G, F and T series Diffs
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Sun, 20 July 2003 21:46
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Shit 4000rpm launch in an heavy car is a LOT of stress!!! torsen diffs are not really what you want for a drag car get a full spool if you want todo stuff like that!
leave the torsen diff for a street car, but for the cast to snap like that its had a SERIOUS hard life before that launch!
Allan
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 00:35
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Matt, it looks like the ring gear survived OK. That is the weakest part of the T series from my experience (apart from bearing wear). I would be surprised if you broke an axle. It looks as if there was a fault with the centre casting for it to do that. You could go for a detroit locker if you wanted something strong that had 100% lock up. They are a little cranky for road use though
I am not too concerned about the strength of either diff. I guess it just boils down to availability and cost of parts. The F series should be the cheaper option if I can get hold of the parts.
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Re: G, F and T series Diffs
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Mon, 21 July 2003 01:14
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The ring gear and pinion had only a few teeth missing , but obviously this occured after the hemisphere failed. The was not much other damage to gears as the thing locked solid instantly. We had to drag it off the trailer with another car !!!
I was thinking maybe an air locker setup ?
has anyone got info on such a device ??
Matt
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Registered:
November 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 01:25
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My two cents.
Obviously, G/F series tougher than T series.
More than a few people have twisted axles and blown diff's
in standard T series rear ends, after fitted a 1G series engine.
Looked at an F series axle from a MX10 Corona Mk II for my RA23, but it measured roughly 50mm bigger than my std axle and with drums and no easy LSD options available, I discounted it.
Similar thing with the ST141 disk brake rear end, about 50 - 60mm wider than mine, solid rotors and a B/W BTR67 or BTR70 diff, way older than the BTR78 that is still serviced by BW, and absolutely no chance of getting an LSD for that after this many years.
So, I have come back to an early Hilux rear axle, G series LSD, and looking at adapting Cressida or Supra rear rotors to this axle.
Cheers,
Mitch.
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 01:53
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| Yojimbo wrote on Mon, 21 July 2003 11:14 |
I was thinking maybe an air locker setup ?
has anyone got info on such a device ??
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You're looking at about $1600 for an air locker, then add the air pump, lines etc and fitting. Not cheap!
Your diff failed because the hemisphere cracked, and an air locker won't prevent this from happening again.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 03:15
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So for the boys using a G series diff, what centre and gear set are you using and what did they come out of???? My understanding is that the gear sets are a rare commodity.
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Location:
Terrigal
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 04:04
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I'm going to have to purchase the gear set 3.9:1 new. This is around $380 inc gst I think.
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 04:38
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G series stuff is far from rare; practically all Hilux's and Hiace's (among other things) have used G series diffs since the 60's. There's a huge range of aftermarket stuff available for them, including gearsets (mostly low ratio stuff) and every type of centre you can imagine.
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Re: G, F and T series Diffs
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Mon, 21 July 2003 05:18
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So what do people recommend for a reasonable price as a replacement in g series.
I have a clutch type lsd center, if i had that reconditioned and shimmed till its tight as a nuns nasty how long would that hold on do you reckon ??
Any ideas on cost ?
I know a full spool is ideal for drag racing but its not too flash on drivabillity esp in the rain (my Wife drives regularly), and tyre wear is hideous.
Matt
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 06:03
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Gear sets are everywhere - new ones are $350-400. The only one you can't get is a 3.7:1 (3.5, 3.9 and 4.1 are all readily available). In addition, there is an incredible aftermarket support service for these diffs thanks to the 4WD scene.....as Norbie said, they have been in trucks since the year dot.
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Location:
Melbourne
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 21 July 2003 09:43
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| Yojimbo wrote on Mon, 21 July 2003 15:18 |
I have a clutch type lsd center, if i had that reconditioned and shimmed till its tight as a nuns nasty how long would that hold on do you reckon ??
Any ideas on cost ?
I know a full spool is ideal for drag racing but its not too flash on drivabillity esp in the rain (my Wife drives regularly), and tyre wear is hideous.
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Well with wifey behind the wheel if you can somehow get a airlocker in an irs housing would probably be the go and while your at it PLEASE check your tailshaft!
A tight LSD is going to have the same manners as a locker basicly and would not want ones missus pointing wrong way at traffic lights!
Look into airlocker or normal LSD and aftermarket (racelogic) traction control
Allan
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: G, F and T series Diffs
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Wed, 23 July 2003 05:05
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what tail shafts all you guys using?
any bolt up
rt132?
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: G, F and T series Diffs
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Wed, 03 November 2004 11:05
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okeys how bout in a ta22.
corona mkII has about right width -this gives me a f series diff
Avante from bout 85 -discs adapt to mkII giving me rear discs, do the axles with discs attached bolt in or do you adapt the discs to the mkII axles?
all thats left is to move the spring mounts.
sound about right?
Cheers
Nathan
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Location:
Canberra
Registered:
May 2002
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Re: G, F and T series Diffs
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Wed, 03 November 2004 11:31
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To do the Avante rear discs to most Toyota live axle housings, you will need from the Avante:
1. Rotor/ drum assebly,
2. Caliper,
3. Hand brake cable,
4. Backing plate, and most importantly
5. The axle retaining plate from the Avante.
Press the bearings off all 4 shafts, and transfer the Avante axle retaining plate to your axles, install bearings and retainers.
Remove old brum brake assembly, including backing plate and replace with Avante gear.
You will also have to relocate the axle housing shock absorber mount, inboard by about 15mm, so that the shocky clears the caliper.
regards Chuck.
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: G, F and T series Diffs
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Thu, 04 November 2004 07:21
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luvly jubly
bolt up goodness!
thanks Chuck
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Location:
Canberra
Registered:
May 2002
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Re: G, F and T series Diffs
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Thu, 11 November 2004 03:19
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TA-022, if you are changing to a MKII Corona diff, all the brackets and spring mount plates from your old diff will be needed on the MKII. None, and I mean none of the MKII brackets for upper and lower links are in the right position. MKII does not have a spring plate.
The MKII live axle housing is from memory 35mm wider than the "T" series housings. I ended up using FWD offset wheels!
regards Chuck.
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: G, F and T series Diffs
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Thu, 11 November 2004 08:15
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does that mean the trailing arms and panhard dont line up ?
if not just rewelding my t series ones in the right spot on the corona housing will work? mig ok?
Cheers
Nathan
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Location:
Canberra
Registered:
May 2002
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Re: G, F and T series Diffs
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Thu, 11 November 2004 08:57
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Yeah you got it, trailing arms and panhard will not line up. If you are considering the disk brake upgrade, you willl need to relocate the shock mounts inboard by 25-30mm.
The guys in Canberra use a shop that has a jig, which was made up to accurately locate all the bracket work.
The guys trash the donor 23 housing removing the brackets, but it is necessary ,so you get sufficient meat off with the brackets.
Mig is fine, just watch the heat, by minimising length of each weld run.
regards Chuck.
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: G, F and T series Diffs
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Fri, 12 November 2004 21:30
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thanks chuck! 
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Location:
Sunshine Coast
Registered:
July 2004
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Re: G, F and T series Diffs
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Sun, 05 December 2004 14:21
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I've been following this disc brake conversion for a bit, all seems a bit too much for me.. (i own an RA60 celica) Im not too worried about blowing my diff out anytime soon since i still only have the 21r-c.. still very interested in finding an lsd, has anyone measured up a hilux diff yet n tried one ? i live one house down from APL 4wd dudes who like me doing skids up the hill  told me they would get me an lsd if i could find the right one.. i have a T series diff, anyone got more details ? any help would be greatly appreciated..
peace,
wes.
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Sun, 05 December 2004 14:51
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You can get a Hilux diff which is about the right width, but suspension pickups will be totally wrong so custom welding is required. You'll also end up with a 5- or 6-stud hub, so more modifications are necessary if you want to keep your 4-stud wheels.
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: G, F and T series Diffs
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Mon, 06 December 2004 08:24
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also can get aftermaerket ratios for the F series at 450 aset
4.6
4.8
and 5,1
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Mon, 06 December 2004 09:29
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I wish you could get tall ratios for the F series... I want a 3.2!
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Location:
Land of Oz
Registered:
June 2004
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Re: G, F and T series Diffs
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Mon, 06 December 2004 11:09
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Hi,
The RA25-MQ and RA25-MQR had a 3.909 ratio F-series. Dunno if it'll fit in your Supra. Should fit into an RA28, wouldn't it?
seeyuzz
river
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: G, F and T series Diffs
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Tue, 07 December 2004 02:02
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yup, they would fit, mostly.
but they are about as easy to find as that rocking-horse shit i've been looking for these past 13 years
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: G, F and T series Diffs
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Tue, 07 December 2004 07:02
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okies i have another idea.
I'm building a Ta22 (big surprise)
Motor is going to be a 4age (how original)
T50 gbox with sprinter bell housing to fit.
and i have a ta22 T series diff drum-2-drum to put in.
Q: Will said T series diff take the 4age eveyday with
occasional drift session one to twice a month?
IF YES
Will Sprinter T series axles with disc brakes bolt into my
T series / or with minimal cost and or modification?
IF NO
What about bolting in a complete Sprinter T Series rear?
If you think my logic is seriously flawed
Smack me in the head.
cheers
Nathan
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Wed, 08 December 2004 02:40
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The T series will handle the corolla motor just fine give normal driving. If you drive it like you want to break it then it will break and the open diff centre will squeel in no time. If you want to "Drift" it then you will want a locker in it anyway. If you do put one in the axles won't last too long.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: G, F and T series Diffs
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Wed, 08 December 2004 04:01
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T series rear ends lick balls. I have broken a few centres with only infrequent harsh treatment and a 4A-GE.
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: G, F and T series Diffs
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Wed, 08 December 2004 06:52
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aight thats two slaps in the head, no T series then.
time to tart buying up for a F series swap then.
thanks guys
Nathan
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Location:
Ballarat
Registered:
January 2005
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Re: G, F and T series Diffs
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Tue, 05 April 2005 01:35
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Just a clarification guys. I need strength and stopping power in my RA28. I currently have an RA60 fitted with a Holden V6 and this is going into my RA28. I currently have a RT142 diff being removed by a local wreaker and have read the tech document on this conversion. Am i best to swap the disk setup from the corona directly on my RA28 diff? (i have a spare diff for the conversion). Should i maybe be looking for a stronger diff? Just to clarify, i'm only after help with the rear disks at this stage. I know what engine i'm putting into this car and that some people won't like it. Stiff. My Car.
But i am realy looking for the correct procedure so that i don't end up snapping to many axels. Also, i would like to make sure the center is the right ratio to suit the V6. In the RA60 it's a bit to "snappy" at the moment. Any help would be appreciated.
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Location:
Brisbane
Registered:
May 2002
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Re: G, F and T series Diffs
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Tue, 05 April 2005 02:23
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The RA28 diff (T series) will have a short and painful life behind a 3.8 litre engine. You will need to upgrade the diff to either an F series (eg Corona MkII) or G series (eg Hilux). There are pros and cons for both options but that's been covered pretty well in this thread.
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I Supported Toymods
Location:
Perth
Registered:
May 2004
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Re: G, F and T series Diffs
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Tue, 05 April 2005 03:46
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since there is already a diff thread....may i just ask....will t18 axles go straight into a jap t series diff...with the big bearings? Can disks be bolted onto it instead of drums? I havent seen a t18 axle before so i ask.. 
cheers
Adam
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Location:
Sweden
Registered:
May 2003
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Re: G, F and T series Diffs
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Wed, 06 April 2005 21:39
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I found out that a Model F van (YR22) have a F-serie diff and it is 144cm between the rims. great upgrade for my TA47 (140cm between rims).
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Location:
Madrid - Spain
Registered:
August 2002
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Re: G, F and T series Diffs
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Fri, 08 April 2005 03:41
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| k@z3 wrote on Tue, 05 April 2005 11:35 |
Just a clarification guys. I need strength and stopping power in my RA28. I currently have an RA60 fitted with a Holden V6 and this is going into my RA28. I currently have a RT142 diff being removed by a local wreaker and have read the tech document on this conversion. Am i best to swap the disk setup from the corona directly on my RA28 diff? (i have a spare diff for the conversion). Should i maybe be looking for a stronger diff? Just to clarify, i'm only after help with the rear disks at this stage. I know what engine i'm putting into this car and that some people won't like it. Stiff. My Car.
But i am realy looking for the correct procedure so that i don't end up snapping to many axels. Also, i would like to make sure the center is the right ratio to suit the V6. In the RA60 it's a bit to "snappy" at the moment. Any help would be appreciated.
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The RT corona diff is wider than the 28 diff and may cause fitment issues with tyres rubbing on the guards.
The RT brakes will bolt onto the 28 diff. Make sure you change the bearing retainers on the axles and while you have the bearings collars pressed off, put new bearings and collars on.
You will need to sort out brake lines and handbrake cable
If anyone knocks you for the engine conversion "tell em ta get stuffed" It's still going to be a big improvement over an 18r-c/g anyway.
The V6 won't brake the RA28 axles unless you lock the centre. Given the engine torque however, you will probably wear out centres fairly quickly. Fortunately they are cheap and easy to come by and install.
I think the auto RA60's had 3.7 ratio's in them. That might be a better gear set for you. I don't know of a T series with taller gears.
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