daigo

Are all S2 trannies the same? IOW did they all have LSD?

jean_noir

no they all do not have lsd. Only S2 with the following serial no's have LSD

083F ASW 944 S2 (1989-1991) Switzerland With LSD

083F AOT 944 S2 (1989-1991) USA With LSD

User 41221

One other bit of info on the S2 trannys... the later ones have the same hardened input shaft/1st and 2nd gears like the 951S trannys. I just found that out from Kevin Gross. I'm not sure at what point they made the switch, tho.

Regards,

Maciek

Scott, would it be safe to assume a 91 S2 tranny has the hardened gears?

special tool

Yes.
The value of these has been going up over the last 4 years because of 951 racers and the ease of the swap compared to the more difficult 968 swap.
In my opinion, an LSD S2 transaxle will be worth $2000++ dollars in the next 1-2 years.
If you see one, better grab it.

jean_noir

I couldn't find one - I had to "make" mine. 90 s2 tranny $350 + 88 951 LSD unit $600 - EBAY hunting

Oddjob

Yes, actually they should all have the hardened input shaft. It was introduced on the 88 951S and was used for all 944Ts and S2 from 89 on.

Im sure its possible that left over inventory of the 86-88 standard input shafts could have been used on early production S2s for MY89, but there is really no way of knowing this, and so you have to assume the transmission part number directory is correct: 016 311 105 AL for the Turbo (S) and S2 input shafts.

Maciek

Ok, I am currently running an open differential 91 S2 tranny in my car. I also have a 86 951 tranny w/ LSD and an external oil cooler laying about that I was planning on putting into the car. I may just sell that and add an LSD to the S2 tranny, or sell both to find a 968 one with LSD.

jean_noir

Can you simply swap out the LSD and sell the open 951 tranny? Also I was told that getting the speedometer sending unit from a 968 tranny to work on a 951 takes a lot of custom work (different signal components).

jim944s2

I'm told even the earlier lsd units will fit in an S2 (or other) gearbox. I finally found a used one, 944 and 917 part numbers. They're not easy to find either, but there are some out there.

jean_noir

917 LSD will fit 944 tranny? Didn't know that. I was told that older Audi LSD units will fit 944's but they are hard to find also.

Oddjob

No, its not a 917 LSD, but the 944/951 LSDs use 917 part numbered pressure discs (internal components of the LSD).

All the factory 944 LSDs are 40% lock and all model year versions currently superceed to the Turbo S 951 332 053 05 LSD unit, so it is fairly safe to assume that they are interchangeable.

944 332 053 00
951 332 053 00
951 332 053 03
951 332 053 04 (Turbo Cup part)
951 332 053 05 (Turbo S)

Since the factory did upgrade some of the internal componets over time and for the Turbo S, my guess is that the later units are a little stronger and/or will last a little longer in a high power/torque car.

User 41221

One thing to be careful of, with respect to the friction discs in the LSD... make SURE you get the right ones for your LSD carrier. The early 951's use 2.0mm discs whereas the 951S uses 2.5mm discs. There is some misinformation floating around out there that you can use the 2.5mm discs in the early carrier to give "more lockup" than the factory 40%. Not only is that not true, but you will get to go back into your diff to fix it shortly after trying to run the wrong discs.

Regards,

Olli Snellman

So according to this S2 with LSD was available only in Switzerland & USA

OK, several different S2 transmissions were available with different codes. I have wondered several times what was so special on the Swiss market that they had own LSD trans? Alpine roads ?

jean_noir

OK correction on my part
083F ASW 944 S2 (1989-1991) Switzerland With LSD
083F AOT 944 S2 (1989-1991) THE REST OF THE WORLD With LSD

I dont know why the swiss are special (cuz they make better hot cocoa?)

total break down:

016J QK 944 (1982-1985) ROW Without LSD "FDR 9:35 (3.8889)"
016J 7Q 944 (1982-1985) ROW Without LSD (M220)
016K QM 944 (1983-1985) USA, Canada Without LSD
016K 8Q 944 (1983-1985) USA, Canada With LSD (M220)
016K QL 944 (1983-1985) Japan No LSD
016K 4M 944 (1983-1985) Japan With LSD (M220)
016J 5Y 944 (1985.5-1988) 924S (1986-1988) ROW Without LSD
016J 5Z 944 (1985.5-1988) 924S (1986-1988) ROW With LSD (M220)
016K 5S 944 (1985.5-1988) USA, Canada, Japan Without LSD
016K 7V 944 (1985.5-1988) USA, Canada, Japan With LSD
016R 5P 944 Turbo (1985 -1988) With Oil Cooler
Standard - 85/86
Optional - 87/88
"FDR 8:27 (3.375)"
016R 5R 944 Turbo (1985 -1988) With Oil Cooler and Limited Slip Differential Optional - 85 thru 88
016S UY 944 Turbo (1987 -1988) No Oil Cooler Standard - 87/88
016S 9U 944 Turbo (1987 -1988) No Oil Cooler but with Limited Slip Differential Optional - 87/88
016R AOR 944 Turbo S (1988.5) 944 Turbo (1989-1991)
LSD standard with reinforced inner plates and
molybdenum coated differential shafts
1st and 2nd gears on drive shaft blasted for extra strength "FDR 8:27 (3.375)"
083D AGP 944 S (1987 -1988) No LSD "FDR 9:35 (3.889)"
083D AGR 944 S (1987 -1988) With LSD
016J ASG 944 (1989-1991) No LSD
016J ASH 944 (1989-1991) With LSD
083F AOS 944 S2 (1989-1991) No LSD "FDR 8:31 (3.875)"
083F AOT 944 S2 (1989-1991) With LSD
083F ASV 944 S2 (1989-1991) Switzerland No LSD, transmission enclosing, and additional oil cooler
083F ASW 944 S2 (1989-1991) Switzerland With LSD, transmission enclosing, and additional oil cooler