It is my hope that this thread can serve as a solid reference point for anyone with questions regarding the various differentials installed in the JZA80.
This is a 'master list' of the factory installed differential configurations offered in the Supra in the US & Japan.
Anyone with further information/corrections is welcomed and encouraged to post up! I will clean/edit this post to suit. I'd like to see this thread or another like it become a sticky to help with these constant questions being posted about differentials.
Notes for this list:
'Big Diff' refers to B0xx-series 220mm ring gear differential
'Small Diff' refers to A0xx-series 200mm ring gear differential (NOT TO BE CONFUSED WITH THE "8in" G-series diff from the MK3 Supra/JZX/FRS/IS300 etc, it's a different pattern and they DO NOT interchange!) (This also means the Nissan/Subaru/Etc "R200" pattern. Different and not interchangeable with G-series or Lexus/MK4!)
'Big flange/Small flange' refers to the 3- bolt input flange (aka companion flange) that bolts to the rubber 'donut' between the diff and driveshaft. This flange can be unbolted and changed on both the small and large differentials.
Here's the info I've got:
By Specific Model:
NA 93.5-96 US spec---- 4.272:1, LSD optional (but rare) small diff, small flange* Code A05A
NA 97-98 US spec---- 4.083:1, LSD optional (but rare) small diff, small flange, Code A01A
TT Auto 93-96 US spec---- 3.769:1, LSD standard, small diff, big flange, Code A02D
TT Auto 97-98 US spec---- 3.769:1, LSD optional but usually installed, small diff, big flange, Code A02A(non LSD) A02D (LSD)
TT 6-spd 93-98 US spec---- 3.133:1, LSD standard, big diff, big flange, cooling 'ears' on diff cover. Code B07D
SZ 5-spd and Auto---- 4.083:1, LSD optional (but rare) small diff, small flange, Code A01A
SZ-R with V161 6-spd---- 3.769:1, LSD optional but usually fitted, small diff, ???? flange** Code A02B
RZ Auto & All GZ---- 3.769:1, LSD optional*** small diff, big flange, Code A02A (non LSD) Code A02B (LSD)
RZ 6-spd 93-5/96 (V160)---- 3.266:1, LSD standard, big diff, big flange, cooling 'ears' on diff cover, Code B03B
RZ, RZ-S 6-spd 6/96-2002 (V161)---- 3.266:1, LSD standard small diff, big flange, normal diff cover **** Code A03B
European Spec: (Thanks Gery, great information!! - Part #'s and more details in Post #3)
TT Auto 93-96 EU spec----- 3.538:1, LSD standard, big diff, big flange
TT Auto 93-96 Austria/Switzerland Spec---- 3.266:1, LSD standard, big diff, big flange
TT 6-spd 93-96 EU spec: 3.266:1 ---- LSD standard, big diff, big flange, fittings to suit external oil cooler.
4.272:1 - US-spec NA's 93.5-96 (Other Export markets too?) LSD optional, small diff, small flange.
4.083:1 - All JDM NA's, US-spec 97-98, LSD optional, small diff small flange
3.766:1 - All JDM & US spec TT auto, JDM SZ-R NA's with V161 6-spd. LSD standard in USDM 93-96, optional 97-98. Small diff, Big flange*(need more info)*
3.538:1 - European Spec TT autos 93-96, LSD standard, big diff, big flange, fittings for external oil cooler*****
3.266:1 - European Spec TT 6-spds and Austria/Swiss spec TT autos, LSD standard, big diff, big flange, fittings for external oil cooler*****
3.266:1 - All JDM TT 6-spds, 93 to May 96 production dates had the 'big' diff. June 96 onward had the 'Small' diff. LSD standard, big flange, cooling ears on diff cover
3.133:1 - All US-spec TT 6-spds. LSD standard, big diff, big flange, cooling ears on diff cover.
AWESOME DIY Diff Build/Assembly Thread:
Any LSD for a 'small diff' application will install into any other 'small diff'. A TT auto or NA Supra's factory option LSD or aftermarket LSD intended for a TT auto or NA will install flawlessly into any other 'small diff' whether it came from a MK4, SC, or GS.
USDM TT autos fitted with the Torsen LSD have slightly longer axle stubs in the differential, and when fitting a TRD LSD or other aftermarket LSD, it is recommended to swap to the NA axle stubs to avoid compressing the CV joints. I suspect this holds true with any 200mm carrier that was fitted with a factory Torsen LSD.
Axles in 92-97 SC300/400's can be swapped into Supras, and vice versa. There is some indication that the axle stubs themselves may have changed size/bolt patterns on some later 2JZ-GE diffs to a smaller pattern that prevents the exchange of CV axles.
Any axles for a 92-97 SC or TT auto/NA Supra should swap across those platforms. If installing a 6-spd 'big diff' into any of those platforms, the bespoke 'big diff' specific passenger side axle is required for optimal CV operation. Some drag racers have told me the thicker early TT auto axle can be used in a pinch, but that installation is difficult and CV life is compromised. I have not confirmed that personally but maybe it'll help someone.
*Early US spec TT's had 29.15mm axle shafts, Early US spec NA's had 26.5mm axle shafts. By '97, the TT axles were 26.9mm, and the NA's were 25.4mm. Strength differences are unknown but I suspect the early TT axles to be the 'beefiest'.
Axle shaft sizing on JDM and Euro market Supras currenty unknown - does anyone have some data on that?
** I'd love to know more about the SZ-R 6-spd's differential, namely the input/companion flange size, if it had the stronger TT axles, and whether or not it shares the same ear-like cooling fins found on the TT 6-spd differential covers. I have read from other sources that the SZ-R 6-spd is a 3.916:1 rear diff ratio. I'd love to see it confirmed as to which one it is, or both, and which years they may be found in.
*** I have no data as to whether the LSD was optional or standard on the auto JDM RZ's and GZ's.
**** All TT 6-spd differentials have the 'ears' of cooling fins sticking out from either side of the differential cover. I don't know if the European-delievered TT 6-spds with an OEM external differential coolers had them, though. I also need confirmation on whether or not the cooling 'ears' were present on all 6/96-2002 JDM RZ's and RZ-S's or if they were eliminated or optional at some point.
*****Did the EU TT autos also get an external diff cooler?
Further info needed-
The JDM NA automatic diffs - some sources say 4.083:1 like the 5MT, others say 4.272:1 and others still say 3.766:1. Anyone know more?
SZ-R V161/6MT cars - LSD standard or optional? Were stronger TT auto axles used, or thinner weak NA ones? Did it have the cooling 'ears' on the diff cover?
JDM TT auto diffs - LSD standard or optional? which years/models?
I'll put together a cross- reference of differential from other vehicles that can be swapped over, and add that to this post or another one in this thread.
Hope this helps!
Edit 10/03/10 : Added differential codes for US spec and JDM models, sourced from http://www.mkiv.de/artikel/allgemein/33.htm
Edit 10/08/10 : Corrected diff code inconsistencies.
Edit 10/13/10 : added search keywords at bottom of post.
Edit 4/6/12 : Corrected US spec axle shaft information, cited source.
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