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81'-82' 931 5 = 944 5 Speed Transacssion ???

 
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epsylon  



Joined: 05 Nov 2002
Posts: 492
Location: South Padre Island, Texas

PostPosted: Sat Apr 03, 2004 2:35 am    Post subject: 81'-82' 931 5 = 944 5 Speed Transacssion ??? Reply with quote

I have been reading through the archives and now my head hurts. I can't seem to find a post that clearly states the interchange of the late model '81-'92 931 5 speed transmissions and 944 transmissions.

I am just curious becuase I have seen some 951 LSD transmissions on eBay as of late and thought that it might be a good upgrade if all it is a simple transmission swap. Meaning I could keep the 931 clutch and torque tube. Anyone know for sure?
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924RACR  



Joined: 29 Jul 2001
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Location: Royal Oak, MI, USA

PostPosted: Sat Apr 03, 2004 3:35 am    Post subject: Reply with quote

I do not believe that the 951 trans is interchangeable with the 931 trans. However the 951 LSD can be installed in the early 944, the 931, or the Audi-style 924 5-speeds. I have a 951 LSD in my racecar, which has a 924 Audi-style 5-speed (instead of the original snailshell).

So, if you can get a good deal on a trans with LSD, you could swap it in it your trans. The diff bolts in, and then you'd just have to shim the diff properly - which is no small feat.
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Vaughan Scott
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epsylon  



Joined: 05 Nov 2002
Posts: 492
Location: South Padre Island, Texas

PostPosted: Sat Apr 03, 2004 5:05 am    Post subject: Reply with quote

thanks for clearing things up. this upgrade still sounds very attractive even though it is a little more involved then a straight tranny swap.

i hate shimming parts for a proper fitting. it always involves way too many on then off again...on then off again adjustments. i just got done doing this with my 924 N/A and the passenger door.
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John Brown  



Joined: 07 Nov 2002
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Location: Leesburg VA

PostPosted: Tue Apr 06, 2004 8:09 am    Post subject: Reply with quote

Vaughan: I think they will swap? What part do you remember not fitting?

The gearing however, might be too high.
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80 931 - #931 44Cup
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Lizard  



Joined: 03 Nov 2002
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Location: Abbotsford BC. Canada

PostPosted: Tue Apr 06, 2004 8:42 am    Post subject: Reply with quote

if the factory transaxle is an audi unit then they should bolt right in, but as stated gearing will be really high.
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wdb  



Joined: 02 Nov 2002
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PostPosted: Tue Apr 06, 2004 10:42 am    Post subject: Reply with quote

do you really think the 944 gearing would be an issue , for acceleration ,hold the lower gear a little longer ? I dont know for sure ,but I think the 944 rpm's at 60 should be around 2K and the 924 would be around 2.5K ,so putting a 944 trans in shoulnd'nt be to much trouble ,well accelerating from 60 in 5 th gear might be a tad slow , downshift ? I mean a healthy 924 engine at 2K should be making ,what 80 HP . should be enough , steep hills might need a lower gear .
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wdb  



Joined: 02 Nov 2002
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PostPosted: Tue Apr 06, 2004 10:57 am    Post subject: Reply with quote

wow big correction here , had a look at some vw 2.0l dyno charts http://www.scirocco16v.com/dyno_index.htm . it seems at 2K rpm's the 924 is only making 25-30 HP . a breeze,hill, ,tools ,full tank of gas and a fat a$$ , yeah , it could be a problem . well if you plan to lighten the load it might work .
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Zuffen  



Joined: 31 Jul 2001
Posts: 1424
Location: Owasso, Oklahoma 74055

PostPosted: Tue Apr 06, 2004 11:14 am    Post subject: Reply with quote

There is no problem fitting the Audi box 81-91 (944/951/931) into anything early.

In 85.5 (944) they went to the dash which required the speedo transducer in the trans. Putting an early trans into a late model car won't work unless you do some spindle swap and add a mechinical gauge.

You really don't want a 951 or 968 trans as the gearing won't work for the low HP of the 924 or 931 or even 944.

I've heard of guys swapping the 6 spd out for the 5 spd just to stay in the power band.

The best thing to do is a swap an lsd into a gear box correct for the car.

At least that is my opinion. Advice not to take too seriously.
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931 1982, 944 1982 euro, 924S 1988SE, 93 968 tip 06 Silver Cayenne S, 06 Black Cayenne S

I have Way too many cars, parts for the 931,944 and 951
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924RACR  



Joined: 29 Jul 2001
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PostPosted: Tue Apr 06, 2004 10:34 pm    Post subject: Reply with quote

OK, I guess I stand corrected - thought it didn't fit.
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Vaughan Scott
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SprintStar  



Joined: 26 Aug 2003
Posts: 150

PostPosted: Thu Apr 08, 2004 2:22 pm    Post subject: Reply with quote

924RACR wrote:
I do not believe that the 951 trans is interchangeable with the 931 trans. However the 951 LSD can be installed in the early 944, the 931, or the Audi-style 924 5-speeds. I have a 951 LSD in my racecar, which has a 924 Audi-style 5-speed (instead of the original snailshell).

So, if you can get a good deal on a trans with LSD, you could swap it in it your trans. The diff bolts in, and then you'd just have to shim the diff properly - which is no small feat.


Why not put a 930 LSD into the snailshell? From what I see on PET, both have the same part numbers.

Sprint.
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924RACR  



Joined: 29 Jul 2001
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PostPosted: Fri Apr 09, 2004 1:54 am    Post subject: Reply with quote

Are you asking that question of me specifically, or technically in general? Technically, in general, yes, you can.

The reason I have my current setup is because the stock snailshell that came with my racecar was destroyed, as was the rest of the car. I converted to the Audi trans (originally a 944 trans) for availability, and later swapped to the 924 5-speed after putting a 951 LSD in it.
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-nick  



Joined: 16 Nov 2002
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PostPosted: Fri Apr 09, 2004 3:47 am    Post subject: Reply with quote

I'm not so sure about using a 930 LSD in the snailshell box. The 931 & 930 LSD part numbers do actually differ by the last character ("C" vs. "G" or something). Whether the difference is just a casting update, or something major is hard to say until someone tries fitting it.

-nick
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