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Location:
Osama's hideout
Registered:
February 2003
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G series diffs
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Tue, 12 July 2005 02:16
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Hi All
my g series lsd in the cressida is losing its LSD effect, ie going back to one wheel under load during the tyre warm up at the drags.
i was speaking to southo today and he told me these could be shimmed up tighter. has anyone had this done if so what are the results?
or if there are any other suggestions i would be greatful for the tips.
until i can get some thing done about the LSD i will most likely weld up a locker for jamboree as its the cheap option with all the costs of jambo coming up. transport, cage, fuel etc.
thanks
shane.
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Location:
Edmonton, AB
Registered:
June 2005
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Re: G series diffs
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Tue, 12 July 2005 02:38
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I'm curious to hear a response. I don't have first-hand experience, but I thought shimming it up meant adding an additional clutch disc (usually robbed from another spare rear-end)...
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Location:
Canberra
Registered:
September 2003
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Re: G series diffs
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Tue, 12 July 2005 04:09
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I had mine fully rebuilt with new bearings etc last week , Instead of extra shims from Toyota the diff place actually used large washers of some sort they get made up.
All i can say is its basically a locker now 
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Location:
Brisbane
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 04:30
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It's a simple procedure which any diff shop should be able to do. If shimmed to factory specs it should be as good as new, but it's also possible to get it shimmed tighter which will make your diff almost feel like a locker... but the downside is the clutches wear faster.
One thing to note, if your clutches are already worn past the allowable limit no amount of shimming will help you... and I'm willing to bet new clutches aren't cheap.
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Location:
Osama's hideout
Registered:
February 2003
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Location:
Brisbane
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 05:02
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If it was me I'd buy a used G series LSD centre.... doesn't really matter where it comes from, but remember you're taking a gamble because a used LSD could be just as "used" as yours is. If you can find it a JZA70 torsen centre is the best bet, no clutches or other wear components to worry about.
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Location:
Melbourne
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 05:04
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how about a trutrac they are apparently available for G series centers?
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Location:
Osama's hideout
Registered:
February 2003
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Re: G series diffs
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Tue, 12 July 2005 05:07
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jza70 guts will fit inside my housing norbie?
true trac?
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Location:
Melbourne
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 05:07
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| Norbie wrote on Tue, 12 July 2005 15:02 |
If it was me I'd buy a used G series LSD centre.... doesn't really matter where it comes from, but remember you're taking a gamble because a used LSD could be just as "used" as yours is. If you can find it a JZA70 torsen centre is the best bet, no clutches or other wear components to worry about.
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JZA70 torsen centers dont like drag use...
http://mkiiitech.com/drj/blownupstuff/torsenclose. jpg
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Location:
Melbourne
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 05:08
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norbie has a F series true trac in his jza61 AFAIK?? norbs?
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 06:50
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New clutch packs, new spring, thicker washer to shim up spring.
What about new full mechanical G ceries centre from TRD - about $1800 clams?
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Location:
Brisbane
Registered:
May 2002
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Re: G series diffs
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Tue, 12 July 2005 23:29
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| Allan wrote on Tue, 12 July 2005 15:08 |
norbie has a F series true trac in his jza61 AFAIK?? norbs?
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Correct, and yes they are available for the G series as well. There are a range of aftermarket clutch-type centres available as well, and even Detroit lockers and air lockers. All this is thanks to the 4WD Hilux which has a G series rear diff, and thus there are upgrade options galore for the rock-hopping nut-jobs.
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Location:
Osama's hideout
Registered:
February 2003
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Re: G series diffs
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Wed, 13 July 2005 00:45
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| Norbie wrote on Wed, 13 July 2005 09:29 |
| Allan wrote on Tue, 12 July 2005 15:08 |
norbie has a F series true trac in his jza61 AFAIK?? norbs?
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Correct, and yes they are available for the G series as well. There are a range of aftermarket clutch-type centres available as well, and even Detroit lockers and air lockers. All this is thanks to the 4WD Hilux which has a G series rear diff, and thus there are upgrade options galore for the rock-hopping nut-jobs.
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whats a true trac worth norbie?
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Location:
Brisbane
Registered:
May 2002
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Re: G series diffs
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Wed, 13 July 2005 01:41
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Should be able to land an F series for $7-800 from the US. G series may be a little more, haven't priced them though.
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Location:
Sydney
Registered:
August 2004
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Re: G series diffs
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Wed, 13 July 2005 03:01
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Hey whats wrong with Rock-hopping Norbie??
Its all in the name of fun!   
But yeah I just picked up a shagged LSD for free off
my 4wd mate who also has a hilux.
with 38"x15" tyres at 8psi, twin diff locks and 70:1 reduction
only managed to strip 2 teeth off the pinion and broke 3 - 4
teeth off the crown. He still drove all the way from Nowra to
penrith with the diff in this condition at 80 kmph.
So these things are tough! No way you'll come close to this
with street tyres. IRS axles will die well before the centre does.
Where is a good diff place to go to for the shim-up and reco in the Sydney area? What is a good price for this job on an LSD
centre??
Cheers guys,
Bart
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Membership Secretary
Location:
Sydney
Registered:
June 2002
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Re: G series diffs
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Wed, 13 July 2005 08:47
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I'm really happy with the True Trak in the back of the wagon.
However it is only an F series so I can't help with price of the G sereis.
as for a Diff guy call John 9671 5800. He is out near eastern creek he installed my true trak into my centre and did a great job.
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Location:
Sydney
Registered:
August 2004
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Re: G series diffs
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Wed, 13 July 2005 23:40
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Thanks mate,
I'll give him a call today to find out.
Oi whats the go with these "True Trac" centres??
How are they different to normal toyo LSD and what
effect does it have when driving? Is it more like
a locker or just a better LSD?
Is it a whole centre, or does it only replace the clutch
discs inside the LSD centre?
Cheers,
Bart
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Location:
Brisbane
Registered:
May 2002
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Re: G series diffs
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Wed, 13 July 2005 23:46
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It's just the centre. It replaces the spider gears and clutch packs with a helical gearset. Kind of hard to explain but if you go to www.howstuffworks.com I think they have some info on the different types of LSD.
When driving it's no different to the OEM clutch LSD except it's more consistent and locks up a little more (in my experience). The only downside is you lose the LSD effect if you lift a wheel, which can be a problem for 4WD applications I guess.
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Membership Secretary
Location:
Sydney
Registered:
June 2002
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Re: G series diffs
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Thu, 14 July 2005 04:43
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What Norbie said.
Its A torsen type LSD/Centre for when you look it up on howstuffworks.
They are pretty tight and they don't really wear out not like clutch limo's do.
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Location:
Osama's hideout
Registered:
February 2003
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Re: G series diffs
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Mon, 25 July 2005 04:19
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ok, so on the way to the chasis shop on saturday the diff went al but completely. any load it just slips like a bitch.
going to weld one up, havent had any luck with a true trac, i seem to run into a dead end where ever i go, i have spoken to several Diff specialists and they all just scratch their head and say to hard, dont want to know.
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I supported Toymods
Location:
Sutho/Hills NSW
Registered:
September 2002
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Re: G series diffs
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Mon, 25 July 2005 04:28
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so its never been rebuilt since you have owned it? its done pretty well for itself if thats the case 
John from importbitz seems to get the jza70 torsen centres frequently, http://importbitz.com/mechanical.htm one just sold here
then all you should have to do is get the crown wheel swapped from the mx83 diff to the supra diff
speak with JasonP on cressida forums as he has had this done
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Location:
newcastle nsw
Registered:
May 2002
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Re: G series diffs
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Mon, 25 July 2005 04:45
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shane, try places in newcastle such as out of town 4wd, opposite lock ect, they should be able too help you out with after market centers ect.
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Location:
Osama's hideout
Registered:
February 2003
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Re: G series diffs
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Mon, 25 July 2005 05:27
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| dcving wrote on Mon, 25 July 2005 14:45 |
shane, try places in newcastle such as out of town 4wd, opposite lock ect, they should be able too help you out with after market centers ect.
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i tired newcastle gearbox and diff and promac, neither wanted anything to do with it. i tried a few 4wd places but they werent confident about the application.
i have spoken to john at importbitz and he is getting me a torsen mechanical centre froma jzx100. and we shoul dhave it prior to jamboree.
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Location:
Forrestdale W.A.
Registered:
October 2004
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Re: G series diffs
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Mon, 25 July 2005 07:01
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There seems to be a lot of conjecture as to whats avaliable for these diff centres. Hilux with the 30 spline axles have a myriad of different locking type centres. I have in my AE86 (yes it has a modified hilux diff with 30 spline axles) a LOKKA mechanical type centre that I bought s/h off ebay for $400 but they should be avaliable from nearly all good 4wd shops. This centre works on a ramp type/dog tooth engagement which only allows 1 wheel to turn if there is no load on it ie around slow carpark stuff. When it engages there is NO slip as the dog teeth engage and effectively turn it into a spool type centre, they can only unlock under a release of load to both wheel.
LOKKA is distributed by 4wd Systems, 599 North East Rd, Gilles Plains South Australia.
Hope this helps
Cheers
Mark
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Registered:
May 2002
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Re: G series diffs
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Mon, 25 July 2005 07:07
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| Quote: |
I have in my AE86 (yes it has a modified hilux diff with 30 spline axles) a LOKKA mechanical type centre that I bought s/h off ebay
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could you give us a bit of a review on how it feels to drive mate? I have only known one person who has used this type.
Do you "feel/notice" the engagement of this type of diff when it goes from open to locked?
How does it respond if you get on/off the gas mid corner etc.
A little review on how you find this type of diff centre would be great 
Cheers.
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Location:
Melbourne
Registered:
May 2002
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Re: G series diffs
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Mon, 25 July 2005 07:41
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| 1JZ.747 wrote on Mon, 25 July 2005 15:27 |
i have spoken to john at importbitz and he is getting me a torsen mechanical centre froma jzx100. and we shoul dhave it prior to jamboree.
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post pics of when it falls to bits, i dought that its any different to a jza70 one
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Location:
Forrestdale W.A.
Registered:
October 2004
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Re: G series diffs
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Mon, 25 July 2005 09:34
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This diff centre is very aggressive in it's actuation and I have learnt how to drive around it. Should you get on and off the gas mid corner, it will unlock and lock again causing you to spin (ahh the fond memories of first driving it.... NOT) should you get off the gas and it unlocks you will have to wait till the car is straight again (or more under control) to really get back into it. I like it as it wont ever break and it drives really well on the street for every day stuff. I haven't had it at the track yet but as soon as the opportunity arises I'll get stuck in and see how it goes, it works great for drag raycin/traffic light duels etc. You can definitely feel it engage on the street, it's a bit clunky but I can put up with the noise even though it's a little disconserting at first.
Cheers
Mark
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Location:
Osama's hideout
Registered:
February 2003
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Re: G series diffs
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Mon, 25 July 2005 23:36
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| Allan wrote on Mon, 25 July 2005 17:41 |
| 1JZ.747 wrote on Mon, 25 July 2005 15:27 |
i have spoken to john at importbitz and he is getting me a torsen mechanical centre froma jzx100. and we shoul dhave it prior to jamboree.
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post pics of when it falls to bits, i dought that its any different to a jza70 one
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it is the same as a jza70 one allan, great to see another positive person around the place.
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Location:
Melbourne
Registered:
May 2002
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Re: G series diffs
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Mon, 25 July 2005 23:50
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dude its PROVEN they dont last under drag use, i showed you photos if you had done some research you will find anyone that takes a torsen diff to the drag strip blows it up.
if you want me to bullshit you and say it will be great your dreaming, try a mechanic or a sales man if you want that kind of crap
have a nice day
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Location:
c'town, NSW
Registered:
May 2002
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Re: G series diffs
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Mon, 25 July 2005 23:54
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perhaps allan is going about promoting discussion on the subject the wrong way
how would a multiplyer diff like a torsen be more effective on a drag car than a clutch, spool or locker?
0 torque x n = 0 torque transfer
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Location:
Canberra
Registered:
September 2003
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Re: G series diffs
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Tue, 26 July 2005 00:43
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I was always under the impression that the Torsen G series also just dont last for drag racing use
I dont know from Experience im using heavily clutched G series and TRD 2 Way G series
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Location:
opening a can of whoop ass
Registered:
June 2004
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Re: G series diffs
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Tue, 26 July 2005 00:48
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i thinks its about longgevity.
a clutch type will have clutches wear out where as a torsen doesnt have clutches to wear out. i believe that is the problem not about the acutal lighting up of 2 tyres.
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