JZA80 Differential Info!

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    Super Moderator Wreckless's Avatar
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    JZA80 Differential Info!

    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:


    US Spec:

    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



    JDM:

    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.






    By Ratio:


    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:
    https://www.supraforums.com/forum/sho...f-Build-Thread



    Notes:
    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?
    Source: http://www.mkiv.com/specifications/ncf/ncf93/ncf160.jpg
    http://www.mkiv.com/specifications/ncf/ncf97/ncf029.jpg

    ** 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!

    Jeff


    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.

    diff diff diff diff diff diff differential differential differential differential differential limited slip limited slip limited slip limited slip limited slip gears gears gears gears ratios ratios ratios ratios ring pinion ring pinion ring pinion ring pinion pumpkin pumpkin pumpkin pumpkin pumpkin
    Last edited by Wreckless; 05-21-2018 at 12:36 PM.

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  3. #2
    Super Moderator Wreckless's Avatar
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    Do MKIII G-series R&P sets or other components swap into a MK4/Lexus 200mm Diff? Unfortunately, no - here's why (Credit to Jeff Lange!!)
    Quote Originally Posted by Jeff Lange View Post
    Toyota started referring to (The MK4 200mm) gearset as 208mm in the mid-2000's, and it is used in a number of late-model Toyota/Lexus models (and always referred to as 208mm after about 2004) including the IS350, IS F, LS460, etc.

    In the 1993 Supra NCF, Toyota refers to both the G-series (MK3) diff (previously referred to as 8-inch) and the new small diff as 200mm (7.87"), however, the same diffs are later referred to as 205mm (8.07") (for example, in the 1997 Supra NCF, and the 2001 IS300 NCF), and then later, for the A80 diff, as 208mm (for example, in the 2006 IS350 NCF). Toyota also updated the measurement of the large JZA80 diff, in 1993 it was referred to as 220mm (8.66") and in 1997, 222mm (8.74").

    So the same diff, (A70) has been referred to, by Toyota, as 8-inch, 200mm, and 205mm, while another was also referred to as 8-inch, 200mm, 205mm, and then 208mm; and yet another was 220 and then 222.

    The most recent designations for these types of differentials is the F20/FD20 for the earlier G-series (8-in, 200mm, 205mm) differential, and F21/FD21 for the newer (8-in, 200mm, 205mm, 208mm) differential.

    The important information is that the A70 differential and the A80 small differential, while historically referred to by Toyota as being the same ring gear size, are NOT interchangeable, and they have been, for the last 15 years or so, referred to as 205mm (F[D]20) and 208mm (F[D]21), respectively.

    JzxStag, the 3.58:1 gearset is probably the best you could realistically find from a Toyota for the G-series.

    Jeff


    Below are JZA80 Supra Compatible Differentials available from other Lexus/Toyota vehicles:

    This is a partial list of all the differentials that can be directly bolted into the JZA80 Supra subframe without modification.

    Note that the driveshafts and axles might need to be exchanged to complete the conversion, depending on the host Supra and the differential used.

    BIG UPDATE 10/7/2014 - Correction to 1997 and earlier V8 models, the SC400 in particular. The pre 1997 Lexus SC400's (as well as the LS400's) used a small flange on their differentials. Sometime in '97 (9/97 according to the EPC) the SC400 and other V8 Lexus models went to the larger flange and larger coupling as used on all TT Supra models.
    I apologize for having flawed information for so long, and for repeatedly passing it along as fact. I'll be cross-checking all of the existing information here to verify accuracy in the Toyota EPC.

    US spec vehicles:

    92-00 Lexus SC300 auto---- 4.272:1, open, small diff, small flange

    92-97 Lexus SC300 5spd---- 4.083:1, open, small diff, small flange

    92-96 Lexus SC400 (auto)---- 3.916:1, open* small diff, small flange

    1997 Lexus SC400 (auto) after MC but before going to 5AT trans - 3.916:1, open, small diff, BIG flange.

    98-00 Lexus SC400 (5AT trans, VVTi)---- 3.266:1, open, small diff, big flange

    93-95 Lexus GS300 (auto)---- 4.083:1, open, small diff, small flange

    96-97 Lexus GS300 (auto)---- 4.272:1, open, small diff, small flange

    98-00 Lexus GS300 (auto)---- 3.916:1, open, small diff, small flange (US Market)

    98-00 Lexus GS300 (auto)---- 3.615:1, open, small diff, small flange (UK/Europe Market)**

    98-00 Lexus GS400 (5AT auto)---- 3.266:1, open, small diff, big flange

    02-05 Lexus SC430 (auto)---- 3.266:1, open, small diff, big flange***

    06-10 Lexus SC430 (auto)---- 3.769:1, open, small diff, big flange***

    I need verification on more of the 00-up Lexus models, anyone with a source of this info PLEASE let me know!

    JDM vehicles: (I'm gonna need some help with this one - anyone have more data?)
    I'm uncertain about this data, if there are errors in this, PLEASE let me know so I can correct it!

    91-97 Aristo 3.0V (2JZ-GTE model, auto)---- 3.769:1, LSD optional, small diff, big flange

    91-00 Soarer 2.5GT-T (Auto and 5spd?)----- 4.083:1, LSD optional, small diff, small flange

    91-97 Soarer 4.0GT (auto) ----- 3.916:1, LSD optional but rare, small diff, big flange


    *Canadian market SC400's came with a Torsen LSD - US spec SC400's did not.

    ** I've found references in the European Toyota EPC that lists the same 3.615:1 ring and pinion kit in the European GS's in the worldwide UCF10 LS400's as well. I know for sure that the LS400 pumpkin does not swap, but it appears that the internal geometry is identical to the 200mm diffs found in the Supra, SC, and GS's of the 90's to early 2000's. If this is true, this means that an LS400 3.615:1 final drive could be installed in a 200mm SC, Supra, or GS diff during a rebuild, if desired. This would be a boon to those wanting a little bit taller gearing than the TT auto's 3.769:1 without having to jump all the way to a 3.266:1, or find an extremely rare 3.538:1 European market 'big' diff.

    *** At least one 2002 model SC430 diff has been swapped successfully into at least one JZA80 chassis without incident. The SC430 differential used in that swap started life as an open diff and had a TT auto's Torsen LSD installed without incident. The SC430 was never offered with a factory LSD, so the TT Supra LSD rear end has become a popular swap for SC430 owners.
    In the 2006 model year, the SC430 went from a 5-spd automatic to a 6-spd automatic, and at that time, the final drive ratio was changed to the same one found in US delivered TT automatics, 3.769:1. Apparently the later 3.769:1 diff, as well as complete Supra TT auto LSD pumpkins, have become a popular swap for owners of 02-05 SC430's interested in the obvious improvements in acceleration. The TRD LSD for the Supra TT auto/NA (small diff) has been a known upgrade for the SC430 community for some time, and the early SC430 diffs should prove to be a readily available option for those seeking to go to a 3.266:1 final drive.
    Last edited by Wreckless; 05-23-2018 at 08:42 AM. Reason: New Info!!!

  4. #3
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    Good information!
    Would be pretty cool to add the OEM part numbers of the respective differential carrier assemblies and/or final gear kits.

    My research regarding the Euro spec differentials:

    EU specs (European states):

    TT Auto 93-96 EU spec: 3.538:1 ---- LSD standard
    Differential carrier assy: 41110-14750
    Final gear kit: 41201-80056
    Differential code: B04D

    TT Auto 93-96 EU spec - Austria/Switzerland Spec: 3.267:1 ---- LSD standard
    Differential carrier assy: 41110-14770
    Final gear kit: 41201-80055
    Differential code: B03D

    TT 6-spd 93-96 EU spec: 3.267:1 ---- LSD standard
    Differential carrier assy: 41110-14740
    Final gear kit: 41201-80055
    Differential code: B03D

    GCC specs (Arab states):

    NA 5-spd 93-96 GCC spec: 3.538:1 ---- LSD optional
    Differential carrier assy: 41110-14750
    Final gear kit: 41201-80056
    Differential code: B04A/D

    NA Auto 93-96 GCC spec: 3.769:1 ---- n/a
    Differential carrier assy: 41110-14760
    Final gear kit: 41201-80057
    Differential code: n/a

    GEN spec (general countries)

    NA 5-spd 93-96 GEN spec: 4.083:1 ---- n/a --- w/o external diff cooler
    Differential carrier assy: 41110-30660
    Final gear kit: 41201-80027
    Differential code: n/a

    (Source: ToyoDIY and several Supra related sites)

    As for the differential details, I have to get further informations. The sizes and flanges should be just like the TT US spec models.//see Diff codes
    External diff cooler: The EU spec diff housing has to be different to the US spec diff as the US housing doesn't seem to have holes/plugs for the cooling lines.
    External euro 6MT diff oil cooler:http://www.toyodiy.com/parts/p_E_199...ZW_4101.3.html
    USDM 6MT diff assy: http://www.mkiv.com/techarticles/aut...l/DSC04538.JPG
    Last edited by Gery; 09-29-2010 at 04:57 AM.
    1994 Supra Turbo 1A1 6SPD

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    Super Moderator Wreckless's Avatar
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    Gery, great information, thanks for the post! I had no idea the EU spec TT autos had unique differential ratios. Do you have any information on European-delivered 2JZ-GE Supras?

    The differential codes for the European Supras you listed show them all as being the bigger B-series 220mm differential, even in the TT automatics. Do you have any way of confirming this? Did the European Spec TT Autos also have differential coolers?
    If those EU spec TT autos all had the larger B-series diff, that means a R&P kit exists to install a 3.538:1 ratio into a USDM TT 6-spd differential!

    Part numbers are a great ideal - I'd love to list that out in the second post once I can get that information together. I want to keep the first post as simple as possible for ease of reference.

    Pictures of as many as possible would also be excellent - once a collection is put together I can host any images necessary on my own server to ensure that they will always work, so this can serve as a viable reference in the future.

    Keep the good info coming!


    Jeff
    Last edited by Wreckless; 09-28-2010 at 01:42 PM.
    Jeff
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    SF Contributing Member artbran's Avatar
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    I thought the diff oil cooler could be retrofitted into the US ones by drilling and tapping?
    -95 widebody 6 speed
    -95 built targa 6 speed

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    Super Moderator Wreckless's Avatar
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    Quote Originally Posted by artbran View Post
    I thought the diff oil cooler could be retrofitted into the US ones by drilling and tapping?
    Yes, it can, it just doesn't have those holes in the differential housing from the factory. That's why you have to add them.

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    SF Contributing Member artbran's Avatar
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    Yeah.. Ok.. Thats what I thought...
    I do however have another question about the cooler. does it actually work well enough to make a difference
    and was it one of those things that we just never got here in the US due to cost or some other factor?

    Also, are there any pictures of these by chance?
    I'm interested in it from pure curiosity and would like to see it not in diagram form...

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    Quote Originally Posted by Wreckless View Post
    Gery, great information, thanks for the post! I had no idea the EU spec TT autos had unique differential ratios. Do you have any information on European-delivered 2JZ-GE Supras?
    Thanks! 2JZ-GE MKIVs see updated post#3 (GCC/GEN specs)

    Quote Originally Posted by Wreckless View Post
    The differential codes for the European Supras you listed show them all as being the bigger B-series 220mm differential, even in the TT automatics. Do you have any way of confirming this?
    The differential code numbers are from this source: Link
    Maybe a member in here has another source to check the codes.

    Quote Originally Posted by Wreckless View Post
    Did the European Spec TT Autos also have differential coolers?
    According to all of my informations, yes. Let me have a look under my car at the weekend to ensure, hadn't time for that yet

  12. #10
    Super Moderator Wreckless's Avatar
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    Quote Originally Posted by Steve Theodore View Post
    Sticky!
    Thanks Steve!




    Quote Originally Posted by Gery View Post
    Thanks! 2JZ-GE MKIVs see updated post#3 (GCC/GEN specs)


    The differential code numbers are from this source: Link
    Maybe a member in here has another source to check the codes.


    According to all of my informations, yes. Let me have a look under my car at the weekend to ensure, hadn't time for that yet
    Gery,

    That's some excellent information, thanks! Did the Arab/GCC delivered TT models share the same specs as the EU delivered TT's?
    Last edited by Wreckless; 09-28-2010 at 02:28 PM.

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    SF Contributing Member artbran's Avatar
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    Took some time but I found some pics of the actual pump on a 6 speed diff.

    These are taken by user David Reid on the UK Supra forums for the Diff he is selling:






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    Quote Originally Posted by Wreckless View Post
    Did the Arab/GCC delivered TT models share the same specs as the EU delivered TT's?
    GCC were NA models only.
    The NA GCC 5-spd seems to be equipped with the differential from the TT Auto EU-spec, and it looks like they both, 5-spd and Auto GCC spec came with the diff cooler (due to the climatic conditions in the gulf region).

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    SupraForums Member Martin F's Avatar
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    Quote Originally Posted by Wreckless View Post
    Did the European Spec TT Autos also have differential coolers?

    Yep, they definitely did.

    Pics attached are from when I parted out a crashed UK spec Auto

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    very nice topic good help !!!nice guy !!!

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    SupraForums Member botchilah's Avatar
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    Is there a link or build thread on how to install a rear diff cooler on USDM 6-speed diffs? My ISP is going crazy at the moment. Everytime I click search the page hangs.
    1995 USDM Supra, AEM S2, assorted HKS goodies, AP BBK, custom widebodykit and FINALLY going single (with a bnew block)
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    ^ that I would be nice I have seen talk of it... some for and some against...

    I looked mine up not to long ago and I have a little different info that you do.

    A 138mm Ring Gear Size


    You have the ring gear as 200mm I found it listed as 138mm.

    I am looking for where I got this info to add to this post.
    MKIV TT



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    Super Moderator Wreckless's Avatar
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    Quote Originally Posted by RogueSupra View Post
    ^ that I would be nice I have seen talk of it... some for and some against...

    I looked mine up not to long ago and I have a little different info that you do.

    A 138mm Ring Gear Size


    You have the ring gear as 200mm I found it listed as 138mm.

    I am looking for where I got this info to add to this post.
    That's the much older series of Toyota diffs, of which the MK3 had the G-series. These diffs used a letter plus a 3 digit number to follow, such as G285.

    Here's the breakdown on Toysport's website:
    http://www.toysport.com/technical%20...ifications.htm

    With the Mk4, SC300, and similar vehicles introduced in the 90's and later, The engine bay/door tags list the differential in 4 characters with a letter at the beginning and the end, such as A01A.

    Here's the breakdown for the JDM options: (From http://mkiv.supras.org.nz/specs.htm )

    Crown Wheel Sizes
    A (8'' - 200mm), B (8.7'' - 220mm)
    Differential Ratios
    01 (4.083:1), 02 (3.769:1), 03 (3.267:1), 04 (3.538:1), 05 (4.083:1)
    Differential Types
    A (Standard open differential), B (Torsen LSD), D (Torsen LSD)

    Thus, a JDM TT Auto with LSD would show an A02B - A for the 200mm ring gear, 02 for the 3.769:1 ratio, and 'B' for the Type 1 Torsen LSD.

    I'd love to find out the diff code for the USDM 3.133:1 ring gear, that's really the only missing puzzle piece from the JDM list. This JDM list is consistent with the diff codes provided by Gery for the European, Middle Eastern, and World models for which he listed information.

    Of further note, this diff code listing is consistent even with my own '01 V6 Tundra beater truck, as it lists an A01A diff on the door tag and it is a factory open 4.083:1 diff - but I haven't measured the crown wheel yet, I will when I install the TRD LSD for it

    Hope that clears up the misunderstanding!

    Jeff
    Last edited by Wreckless; 09-29-2010 at 01:53 PM.

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    Blood for Blood RogueSupra's Avatar
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    ^ yes Jeff it does...

    I did update my info sheet for my Supra TT.

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    I was wondering if anyone figured out if the Euro spec 3.53 Auto R&P will fit on a US Spec 6 speed differential? If so I can get all of these ring and pinion kits tax free. You will have to pay the US dollar to the Euro rate for that particular day. Just thought that I could help out as well. I can also get the external pump etc. whatever anybody needs I can get tax free.

    Gery great information!

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    97Silber: I'd be interested if that was the case. Do you have any idea what the current rate is for the pump setup and 3:56 gears?
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    Super Moderator Wreckless's Avatar
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    Quote Originally Posted by 97silbersupratt View Post
    I was wondering if anyone figured out if the Euro spec 3.53 Auto R&P will fit on a US Spec 6 speed differential? If so I can get all of these ring and pinion kits tax free. You will have to pay the US dollar to the Euro rate for that particular day. Just thought that I could help out as well. I can also get the external pump etc. whatever anybody needs I can get tax free.

    Gery great information!
    Yes, they are the same ring & pinion size and by everything I can find, it would be a direct swap for the US spec 3.133:1 ring & pinion, or the whole differential would swap if that's what you wanted to do.

  24. #22
    Boost Addicted. 4wd-eclipse's Avatar
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    Interesting thread .. Thanks a lot Jeff for sharing those info.
    MK

    *95 Supra TT 6-Speed Hardtops .. Stock long block, VVTi head with GSC S2, AEM Infinity EMS, PTE PT7275 Gen2, HKS turbo manifold, TMS intake manifold, ETS Intercooler, ID1300, LQ9, HKS Super Drager, VR TE37, GReddy Big Brakes, ...

    My Supra pics thread : https://www.supraforums.com/forum/sho...t=#post9787793



  25. #23
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    Quote Originally Posted by Wreckless View Post

    US spec vehicles:


    92-97 Lexus SC400 (auto)---- 3.916:1, LSD optional but rare* small diff, big flange

    98-00 Lexus SC400 (auto)---- 3.266:1, LSD optional but rare* small diff, big flange

    I need verification on the 00-up Lexus models, anyone with a source of this info PLEASE let me know!

    *I've personally found an SC400 in the junkyard with a 3.916:1 rear diff with an OEM LSD installed. The car was 100% stock, so I assumed this to be an OEM option, not parts-swapping from a MK4.
    Other sources indicate that no Lexus model was offered with an LSD until the IS300 debuted in 2001. I'll update this list as soon as I can confirm it one way or another.
    That is VERY interesting/strange. What year SC400? 1992-1997 had the 3.916 ratio so that is my guess. Possibly a factory magazine or pre-production car that was so fitted?

    I have always believe your quote "no Lexus model was offered with an LSD until the IS300 debuted in 2001"

    Any known 1998-2000 SC400s with confirmed LSD factory installed per above?

    It is very normal for the open diffs to develop enough internal friction to function as an LSD (both tires spin burnouts).

    The 1998-2000 LS400s with 3.266 open diffs should also be a bolt in with the possibility of swapping the diff cover for bolt placement.

    Here is my 1999 LS400 with an open diff that has gone LSD.


  26. #24
    Blood for Blood RogueSupra's Avatar
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    1994 USDM TT Auto MKIV Supra

    Rear end is an “A01D” Torsen Limited Slip Differential or LSD:
    • A- 8inch crown, 200mm ring gear size
    • 01- 4.083:1 ratio
    • D- Torsen LSD 4 pinion

    Differential ratio: 3.769


    Ok so how does that all look? Correct....

  27. #25
    SupraForums Member MikeS93's Avatar
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    Quote Originally Posted by Wreckless View Post
    That's the much older series of Toyota diffs, of which the MK3 had the G-series. These diffs used a letter plus a 3 digit number to follow, such as G285.

    Here's the breakdown on Toysport's website:
    http://www.toysport.com/technical%20...ifications.htm

    With the Mk4, SC300, and similar vehicles introduced in the 90's and later, The engine bay/door tags list the differential in 4 characters with a letter at the beginning and the end, such as A01A.

    Here's the breakdown for the JDM options: (From http://mkiv.supras.org.nz/specs.htm )

    Crown Wheel Sizes
    A (8'' - 200mm), B (8.7'' - 220mm)
    Differential Ratios
    01 (4.083:1), 02 (3.769:1), 03 (3.267:1), 04 (3.538:1), 05 (4.083:1)
    Differential Types
    A (Standard open differential), B (Torsen LSD), D (Torsen LSD)

    Thus, a JDM TT Auto with LSD would show an A02B - A for the 200mm ring gear, 02 for the 3.769:1 ratio, and 'B' for the Type 1 Torsen LSD.

    I'd love to find out the diff code for the USDM 3.133:1 ring gear, that's really the only missing puzzle piece from the JDM list. This JDM list is consistent with the diff codes provided by Gery for the European, Middle Eastern, and World models for which he listed information.

    Of further note, this diff code listing is consistent even with my own '01 V6 Tundra beater truck, as it lists an A01A diff on the door tag and it is a factory open 4.083:1 diff - but I haven't measured the crown wheel yet, I will when I install the TRD LSD for it

    Hope that clears up the misunderstanding!

    Jeff
    My axle code on my 93.5 6/speed is "B07D" and what does 07 stands for?
    93.5 6/speed supra, SP67GTQ, RPS C/C, HKS 264s, AEM, Ivey tune, CCW/ET Street. TRD LSD, 3.27 gear.

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