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Location:
townsville NQLD
Registered:
February 2004
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 07:36
 
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Corona Mk2 diffs need to be left on Corona Mk2s.
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Location:
Brisbane
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 08:55
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Ahaha I was waiting for that. 
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Location:
Northwestern Sydney
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 09:05
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Diff ratios on the 2 I have are 3.9 the build plate showed them as F312.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 10:56
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| gianttomato wrote on Wed, 23 February 2005 18:36 |
Corona Mk2 diffs need to be left on Corona Mk2s.
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thats about all they are good for
yes i think mine are 3.9:1 ratios too
brett
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Location:
Canberra
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 11:45
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thats about all they are good for
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You mean, thats all that's worth having from them j/k
brettcelicacoupe: Do you have some scales that you could weigh the diff on (without trailing arms) for comparison? I didn't get to weigh mine before fitting in my corolla, but I know it was a lot easier to lift than a hilux diff.
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Location:
Melbourne
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 11:56
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| gianttomato wrote on Wed, 23 February 2005 18:36 |
Corona Mk2 diffs need to be left on Corona Mk2s.
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no thay should be replaced with hilux diffs and then sold off to celica owners with poofy torqueless engines
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Location:
Melbourne
Registered:
January 2003
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 12:08
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| gianttomato wrote on Wed, 23 February 2005 03:36 |
Corona Mk2 diffs need to be left on Corona Mk2s.
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But if its not going to be left there since its out , please sell me the axles to replace my twisted ones
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 12:12
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| Allan wrote on Wed, 23 February 2005 22:56 |
| gianttomato wrote on Wed, 23 February 2005 18:36 |
Corona Mk2 diffs need to be left on Corona Mk2s.
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no thay should be replaced with hilux diffs and then sold off to celica owners with poofy torqueless engines
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i was told that they handle plenty of power/torque ....well at least that of a 1ggte
i will weigh it possibly tomorow
brett
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Location:
Brisbane
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 12:41
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If an F series diff can live for 2 years behind a 2JZ-GTE running 18psi, I don't think it can really be called weak...
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Location:
Brisbane
Registered:
June 2003
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Re: corona mark 2 diff FAQ; with pics
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Wed, 23 February 2005 13:03
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even im goign to begin my conversion with an F series...i dont expect it to last when i hit the circuit, but when that comes to crunch ill let you know how tough they are. Im looking at a G series swap, but its a huge mofo job to swap the IRS in.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Thu, 24 February 2005 10:52
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is it 100% true that the corona RT141 disks and callipers will go straight onto a mkII diff??
is there any mods involved??
brett
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics
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Fri, 25 February 2005 02:09
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Yep the RT discs will fit but you will also need the RT bearing retainer due to the thickness difference between the MX23 drum backing plate and the RT caliper mount.
Ohh and AFAIK only the MX23 has an F diff, the earlier ones have E series diffs and they suck 
You might want to measure the outside diameter of the banjo housing. Cos I picked up a diff out of a MX23, it had F312 on the compliance plate but it turned out to be an E series, Obviously tranferred there from some celica owner after a F series diff. So yet GT, all MX23 diffs should remain attached to MX23's.....until of course they get to a wrecking yard, in which case they should find their way to my celica
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Fri, 25 February 2005 03:12
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Nice pics etc. Obviously I'm wrestling with the thought of knowing that Corona Mk2s are being wrecked.
MX10/12/22 had E series diffs. MX13 and 23 had F series.
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics
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Fri, 25 February 2005 03:30
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I know how you feel, I got all emotional and shed a tear the other day when I saw 3 RA28's at pnp. 
Or it could have been dust in my eye from trying to remove another E series centre from a cressida
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Location:
Canberra
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Fri, 25 February 2005 07:06
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MX10/12/22 had E series diffs. MX13 and 23 had F series.
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Yep. My two MX13's both had F312 diffs, one was auto, the other manual.
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Location:
townsville NQLD
Registered:
February 2004
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: corona mark 2 diff FAQ; with pics
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Fri, 25 February 2005 23:39
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bah pnp only have ghosts of former ra28's.
they seriously need more old schoolers in there for us all.
i had to buy half my dash from Celica Spares...pffft $120 fot glovebox surround and lower dash trim that holds the fuse box.
but as the guy said "You just bought rocking horse sh*t, there as rarae as to find in good nick"
but he had it so whom i to complain.
F series diff mmmmmmmmm
*pulls out grinder* time to kill another corona. MUHAHAHHA
Nathan
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Location:
Brisbane
Registered:
June 2003
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 10:19
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I guess a picture of said Corona mkII is too much to ask for..
It would make searching wreckers yards more useful..
Climbing 3 levels of cars to check build plates is great exercise. I'd rather not.
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Location:
Melbourne
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 10:38
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| boudan wrote on Sat, 26 February 2005 21:19 |
I guess a picture of said Corona mkII is too much to ask for..
It would make searching wreckers yards more useful..
Climbing 3 levels of cars to check build plates is great exercise. I'd rather not.
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Location:
Melbourne
Registered:
January 2003
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 10:45
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| gianttomato wrote on Thu, 24 February 2005 23:12 |
Nice pics etc. Obviously I'm wrestling with the thought of knowing that Corona Mk2s are being wrecked.
MX10/12/22 had E series diffs. MX13 and 23 had F series.
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Heres another thought for you Gt , i will buy a that $300 one in the trading post for a axle {and put the twisted one back in it } you can have the rest of the car ? that way you can sleep at night with the thought you saved another one  . I just don't have the room with a ae86 a week being crashed into wrecks in this side of town .
That guy in your signature at the bottom of your post does he wreck corona's ? i could also pm him i guess
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 11:24
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...thats a coupe, and there is sedans too. thats where i got mine from.
i did see a mx13 coupe in townsville the other day too
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Location:
Brisbane
Registered:
June 2003
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 12:58
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I've seen something similar, except the rear end was leaf sprung - I couldnt figure out what it was.. It was a corona with "X series" ? stickers down the side.. Coupe with snazy black leather seats.. engine was 2t but dont quote me on that..
Puzzeled...
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Location:
Brisbane
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 13:02
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Probably a Corona XX, which has a plain old Corona (not a MkII) with some snazzy extras. They were available as a 2-door.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 13:21
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what motor did the corona XX's have??
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Location:
Brisbane
Registered:
June 2003
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 13:50
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Not sure on the engine, sorry to get off-topic... Very useful info !! thanks brett!
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I Supported Toymods
Location:
Glenmore Park, NSW
Registered:
March 2004
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Re: corona mark 2 diff FAQ; with pics
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Sat, 26 February 2005 22:56
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hmmmm just thought of a adittion for your sig Allan.
"Only the sexually stunted drive Supras"
LOL
celica owners are sexually challenged...BWAHAHA
/end pointless rant
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Wed, 02 March 2005 03:21
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okay,
today i weighed the corona mkII diff (the one in the pic)
It came out to 58kg + or - 3kg due to using dodgey bathroom scales.
it didnt have on it;
-trailing arms and panhard rod
-wheels
-handbrake cable
it did have on it;
-was full of oil
-drums were on it
brett
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Location:
Canberra
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics
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Wed, 02 March 2005 06:19
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| Quote: |
It came out to 58kg + or - 3kg due to using dodgey bathroom scales.
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Thanks for that
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Wed, 02 March 2005 08:32
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i reckon you could cut off about 5kg or so using the rt141 disk setup.
much lighter than the hilux ones, i read they were like 85kg or sumthin
brett
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics
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Sun, 13 March 2005 06:30
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okay,
i pulled one of my RA40 diffs apart and measured the axle.....so:
corona markII
minimum (weakest point), axle diameter = 27mm
spline = 27 teeth
RA40
minimum (weakest point), axle diameter = 23mm
spline = 23 teeth
i will have pictures in the next 1/2 hour or so
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 07:21
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here are the photos
these 1st two are comparing ra40 and mkII axles
it it obvious which is the mkII axle  
these photos are comparing the diff's themselves
MK II diff is the "rustier" one with the mounts cut off
here is another interesting fact
corona mk II tailshaft fits (unmodified) onto a "T" (RA40 at least) series diff. the front uni. also fits straight into a W5*
this would be good for somebody chasing a 1-piece tailshaft
although for a RA40 (probly the same as a xA23/28) it needs to shortened about 2 inches (best to see 4 ureself)
brett
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 08:21
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and just to throw a little bit of extra info in here....
I just went and dodgy measured my RN41 hilux axles...
30 Spline
30-31mm diameter (only had a ruler sorry - some bastard stole my vernier calipers)
This kind of gives an indication of why they are considered "unbreakable". If i can get a chance to weigh mine before i post it off, i will do just that and post it up.
Brett, VERY useful information you have here.
A QUESTION, IF I MAY:
I had thought that the MX23 diffs were 1390mm face to face, and not 1410mm. Can anyone confirm this?
Using the RT142 corona rear discs (or ST141) - is the width affected much/at all. Reason is i am still considering my options for the RA28, and would like to retain my dishy Simmons which dont have too much room to go outwards. Thus staying closer to the RA28 width of 1380mm is preferable.
Can anyone comment/confirm? Anthony, Joel??
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 08:25
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Definitely 1410mm.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 08:30
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POO POO!!!
**walks back to drawing board.....**
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Location:
Terrigal
Registered:
May 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 08:41
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Yup I can confirm that  hence having +34mm offset wheels on the rear now which still scrub.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 11:41
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| THE WITZL wrote on Sun, 13 March 2005 19:21 |
and just to throw a little bit of extra info in here....
I just went and dodgy measured my RN41 hilux axles...
30 Spline
30-31mm diameter (only had a ruler sorry - some bastard stole my vernier calipers)
This kind of gives an indication of why they are considered "unbreakable". If i can get a chance to weigh mine before i post it off, i will do just that and post it up.
Brett, VERY useful information you have here.
A QUESTION, IF I MAY:
I had thought that the MX23 diffs were 1390mm face to face, and not 1410mm. Can anyone confirm this?
Using the RT142 corona rear discs (or ST141) - is the width affected much/at all. Reason is i am still considering my options for the RA28, and would like to retain my dishy Simmons which dont have too much room to go outwards. Thus staying closer to the RA28 width of 1380mm is preferable.
Can anyone comment/confirm? Anthony, Joel??
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yes, i would like to kno about the corona disk conversion offset too
thanx
brett
[Updated on: Sun, 13 March 2005 11:45]
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Sun, 13 March 2005 23:17
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| Quote: |
Can anyone comment/confirm? Anthony, Joel??
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Wouldn't know, don't own an F series diff
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yes, i would like to know about the corona disk conversion offset too
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Makes SFA difference to total width. While the backing plates are thicker to support the caliper (not dust cover in drums), this does not change the total width as the axles do not move.
The front of the disk is roughly the same thickness as the drum, so this will have little if any effect.
Incidently, since i am going to be moving and having a garage sale soon, if anyone here is interested, I have a set of RT discs, calipers and axles/bearing retainers for a conversion. they will bolt onto a T series or MX23 diff and all you need to sort out is a handbrake cable and brake lines.
Probably asking $80 for them.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Mon, 14 March 2005 09:44
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just to clarify something else; mark II tailshaft is 40mm longer than the celica ra40/28/23 tailshafts.
| gold28 wrote on Mon, 14 March 2005 10:17 |
Incidently, since i am going to be moving and having a garage sale soon, if anyone here is interested, I have a set of RT discs, calipers and axles/bearing retainers for a conversion. they will bolt onto a T series or MX23 diff and all you need to sort out is a handbrake cable and brake lines.
Probably asking $80 for them.
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may be interested, depending on how far away you are (i dont know city in your sig.)
do u have pictures of these items....for the sake of the MK.II diff thread
also what specifications are they??
thicknes, diameter, pistons etc.
thanks
brett
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Mon, 14 March 2005 22:41
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I'm in Sydney.
I will drag them out sometime in the next couple of days and take photos/measurments. basically they are a solid disc, largish in diameter, smallish pad size and internal drum handbrake. 4*114 stud pattern and bolt up to a T/E/F series diff with same stud pattern
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Wed, 16 March 2005 08:40
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Here is the corona RT141 brake info for ya.
Disk Diameter = 280mm
Disk thickness = 9mm (solid)
Pads are approx 100x30mm
Single Piston, approx 40mm diameter
Internal Drum handbrake didn't measure diameter but who really cares about that anyway.
Not the most impressive of brake setups but they are easy to work on and pretty much hassal free (unlike) the XE falcon discs I had to pull apart last weekend, what a shocker of an engineering effort that is.
And you they will bolt up to the MX23 F series axle, also a T series and an E series (provided they are the same stud pattern). You will need to sort out handbrake cables. i have the corona ones but i have not tried to fit them into the celica so I can't comment. Also the solid brake lines on the diff housing need to cut and flared to accept the caliper hose.
Anyhow here are some photos
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* new pics and specs
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Wed, 16 March 2005 11:48
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okay, sweet,
thanks for that
brett
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Location:
townsville NQLD
Registered:
February 2004
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Mon, 28 March 2005 03:12
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Welding the mounts onto the diff housing puts a lot of heat into it. This will cause the housing to distort and you will end up with wheels pointed in different directions.
My advice would be to ditch the rod and use some box section steel. This is what I did and ended up with only about 1mm of movement in the axles. If I get a chance this afternoon, I will post some pics of my jig.
The axle tubes can be straightened if they end up bending, but you are better to avoid that mess if you can.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Mon, 28 March 2005 07:54
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thanks for that gold28
i dont quite understand what you mean about box steel....are you talking about replacing the 12mm rod on the jig or what?? 
anyway just to clarify my plan;
1. make the jig...it bolts onto the 2 holes at the end of the diff...and holds the mounts in the right position in relation to the outside holes(4 on the end)
2. cut the mounts off the T series diff and grind the curves out to the origional radius.
3. bolt the mounts (the ones that were just cut off) to the jig
the jig will hold the mounts in the right spacing from the end and also hold them in the right rotational position
4. then, the jig (with mounts attached) will be bolted onto the F series diff (via 2 of the holes on the end) .....and *theoretically, the mounts will be sitting on the F series diff in the same configuration as they were on the T series diff.
5. then i will weld the mounts that were cut off the T series diff onto the F series diff....and the jig will kindly hold the mounts in posi when i weld them.
thanks
brett
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Mon, 28 March 2005 09:51
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The process sounds fine, here is a photo of my jig.
As you can see, it is pretty sturdy. The jig picks up on two studs on the centre part of the housing and also two bolts on the end of either axle tube. This ensured that the housing remained straight. The rest should be pretty obvious.
here is the finished item, as you can see, I played around with the lower mount a little and moved the shock mount a little lower so I didn't have to worry about pruchasing short stroke shocks
best of luck with it.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Mon, 28 March 2005 10:07
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ah yes, i understand
so you *made* your mounts instead of chopping them off an old "T" series diff
i might do that instead.
i might remake my jig as well i think ........make a full length, solid one
thanks for that gold28
brett
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Mon, 28 March 2005 21:33
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Cutting and reusing the mounts off a T series is fine when you are putting them onto a G series as teh axle tubes are a lot bigger. The F series axle tubes aren't much bigger than the T series so it is really difficult to get them off without damaging them too much. I wanted to change the lower mounts anyway, so it was easy for me to refabricate the upper ones.
The seam down the middle was just because it was easier for me to make them that way.
My jig didn't have a mount for the pan hard rod as I originally wanted to install a Watts Link. After bolting the diff in however I decided it was too much effort to modify the tank, exhaust and make another chassis mount so I just put the pan hard mount back on.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Wed, 03 August 2005 11:12
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UPDATE
ive made a full length jig out of 2 x 4 box steel and it seems all good
one question - are the axle tubes going to distort when i weld the new mounts on??
any tips would be good
brett
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Fri, 05 August 2005 10:09
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here is my jig - as below.
so ill ask my question again - will the axle tubes distort when i weld it?? any tips for doing this??
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Location:
Madrid - Spain
Registered:
August 2002
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Fri, 19 August 2005 03:23
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Sorry I didn't get back to you earlier Bret, I don't have much in the way of internet access at the moment so it kinda makes things a little difficult.
The jig looks great.
Wether the axle tubes bend much depends a lot on who/how it is welded together. Try not to spend too much time welding in one place. Otherwise you will put too much heat into the tubes and streatch the metal. Mine moved about 1-2mm from the centre to the ends of the tubes, resulting in barely measurable changes in camber and toe. Tyeing in the ends of the axle tubes as you have done will help a lot with restraining any movement.
If it does bend more than you are happy with, you can apply heat with an oxy torch to streatch the opposite side but my preference is to do it right first time and not have to patch things up after.
Your jig should give you a good indication of how much movement you have, ie can you fit the bolts back in the axle tubes. if not a straight edge along the tubes will show up any significant bends.
Best of luck.
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Location:
townsville NQLD
Registered:
February 2004
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Re: corona mark 2 diff FAQ; with pics *update* photos of my jig
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Sun, 21 August 2005 03:18
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thanks for that gold28
yes i think with a plate bolted to each end of the axle tube , AND that flat plate bolted to the diff centre mounting face, it shouldn't move anything significant.
thanks for replying anyway
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, mkII flanged on one end and the other end to suit a W40/W50.......not quiet, from my observations the tailshaft will need to be shortened by around 2 inches or so.
