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HOw do i identify the diff without opening it up ? Tried looking on the diff housing for the 4 letter but cant find it. Thanks
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Try the build tag in the engine bay (if its a JDM) or the door tag on the drivers side door jamb if it is a USDM supra. If your Supra is from a different market than either of those, I'm not sure where you'd find that info..
There is a lot of info on the Japanese Supra diffs on my site at http://mkiv.supras.org.nz/specs.htm near the bottom of the page.
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Owned and raced since Feb 1998.
I have a MKIV TT with Getrag 6 speed with big 3 bolt flange.
I have changed the big diff to a N/A Auto diff(small one) with. 4.083 ratio. and small 3-bolt flange.
Is there a driveshaft that will fit?
Or is it possible to use the 3-bolt companion flange from the big diff?
Hi.I bay diff from UK. This is ratio 47:13 3.615:1 no LSD. Small 200mm ring.What is this diff?
I am pretty sure I have read a few times that the gear ration on 97-98 6 speed USDM cars is different from the 93-95 cars. No?
1997 RSP/Black Hardtop 6 Speed Proefi
2018 Infiniti Q60 TT
There are two other ratios I know of for the 220mm 'big' diff - 3.266:1 and 3.538:1
The 3.538:1 ratio was only ever fitted to some European market TT automatic cars, and some Middle Eastern market NA's.
The gear ratio for US & North American NA's in 93.5-96 was 4.272:1 and 97-98 NA's had a 4.083:1. These were only in the 200mm 'small' diff with the small companion flange. LSD was always an option. Since those ratios are different, that might be what you read about.
1998 Toyota Supra Turbo
6 Speed Manual
Final Drive 3.27:1
1st Gear Ratio 3.83:1
2nd Gear Ratio 2.36:1
3rd Gear Ratio 1.69:1
4th Gear Ratio 1.31:1
5th Gear Ratio 1:1
6th Gear Ratio 0.79:1
1. ALL Models:
2. Listed as Standard:
3. Normall Aspirated LSD Listed as Standard:
2012 Toyota Sienna LE 2.7L 6AT (w/Convience Package + Preferred Package)
2018 Ford Explorer XLT "Interceptor" (4WD & Tow III Package)
2014 Ford Police Interceptor Sedan 3.7L AWD 6AT
1994 Toyota Supra 5MT SZ-R (Series 1) *SOLD*
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Ok will do.
1995 Supra Black/Black Hardtop, 6-speed single turbo 630 rwhp pump gas/meth. (my weekend car)
1998 Supra Imperial Jade Mica Auto, single turbo 390 rwhp at 14 psi pump gas (wife's weekend car)
2008 Tundra, Nautical Blue Crewmax Limited, something has to be stock.
1995 Mr2 turbo, White/tan w/gen4 swap, 5-speed.
1989 Mitsubishi Starion Red/Black turbo 5-speed hardtop (Retro beater)
After reading Jeff's original post I noticed the code A05A is used for.the 4.273 diff for USDMNA Supras. However, my 94 NA (vin also states it's a 94) and axle code is A01A which means it has a 4.08 diff. A few years ago, I did remove my diff and confirmed it was a 4.08 on a 94. I did switch out to a 4.27 with a TRD LSD.
I 'm starting to see certain jdm parts on a USDM Supra, ie I've seen jdm dampeners and springs on stock USDM Supras.
Do you have a production date for your car, and what was your original gearbox? W58?
Also, anyone with a '98 NA, I'd REALLY like to hear about your rear diff and whether or not it has a factory LSD!
Edit: I suspect that what might be the case with the NA's is that they had different ratios depending on the transmission just like the SC300's, with a 4.082:1 for W58 cars and a 4.272:1 for automatics, changing to 4.082:1 for all NA's in 97-98. This angle will definitely take more research. I suppose it's time for me to check the ratio in the original diff of my own '95 SE W58 car... embarrassing! lol
Last edited by Wreckless; 04-06-2011 at 10:31 AM.
You've been in the game long enough to know that a site like Supercars.net needs to be taken with a grain of salt, as it's simply a cesspool of unconfirmed regurgitated info for high schoolers to drool over.
Somehow they crossed the ratio spreads. In '98 The JDM TT's had the 3.266:1 diff but it had a V161, and that gear spread is clearly a V160.
Whereas the USDM TT 6-spd models all came with a 3.133:1 final drive and a big diff, from 1993 to 1998.
Note that the second link is comparing the JDM market 3.266:1 ratio against the original 3.133:1 ratio. Also remember that PHR sold the 3.266:1 big diff ring & pinion as an upgrade for US spec cars back in the day.
There's a lot more inconsistency with the NA's, as I'm learning, but the TT's being so central to everyone's interest are pretty much solidly nailed down.
If you can find any actual Toyota USA documentation to support the idea that '98 TT 6-spd's had a 3.266:1 diff, I would *really* like to see it.
What about your existing IJM car? have you confirmed the ratio installed in it? Didn't it sit around unmodified for a long time? What does its door tag indicate?
Last edited by FLZ_Boy; 04-06-2011 at 09:08 PM.
Well, there goes the list I sourced originally!
Looks like the differential codes aren't just unique for a given platform, but they're unique between sub-models like the NA and the Turbo.
So do you think this was a matter of what parts were 'in the parts bin' at the time, or was there some way to order the different ratios?
I'll be doing some digging & information collection and I'll update the hell out of the this list.
My neighbor pmed me and confirmed his 98 NA did come with an LSD. He'll let me know the code when he comes back into town.
Hi all, thanks for the good info.
I have a 4.27 SC300 auto diff that I'm retrofitting into a LS400 (for racing)... does anybody have what the stock part number for the 93- Supra TT auto LSD? My understanding is that this will fit the SC300 AT diff, but I need the part number to try and source from Toyota directly. Alternatively, if anybody has a used torsen, I'd like to get one!
I followed up my neighbors 1998 NA. His axle code is A05A, which meant its a 4.08 with an open diff, but he confirmed to me it had a torsen LSD.