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Jazzerpet · Joined: 07 Apr 2003 Posts: 186 Location: Omaha, NE.

I have a tranny that has been sitting around my shop for a wile. I put it on the bench yesterday and noticed that when I turned one axel the other turned the same direction. This happens if it is in or out of gear. It is a 5 speed out of an 80 931. I found these #’s on it;

477 301 102 AA MB

931 301 301 OR

M6K

I was going to bust it open and check the internals for wear. Then maybe keep it or the parts from it as spares for my 931. The tranny that is in the car is different, when one wheel is turned the other turns the opposite direction.

Would the assumption that the one on the bench is an LSD be correct?
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1980 931
1985 ½ 944
Member of the “Omaha Crew”

Paul · Posted: Mon Jul 25, 2005 11:16 am Post subject:

A stock 931 snailshell tranny has 12 as the last 2 numbers of its serial number.

Jazzerpet · Joined: 07 Apr 2003 Posts: 186 Location: Omaha, NE.

Where do I find the serial number? I assumed it would be on a plate attached to the unit but found no plate present.
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1980 931
1985 ½ 944
Member of the “Omaha Crew”

Paul · Posted: Mon Jul 25, 2005 1:02 pm Post subject:

You've listed it above.

Someone may have converted your tranny.

Smoothie · Posted: Mon Jul 25, 2005 1:46 pm Post subject:

Those look like part numbers above.
A '79-'80 USA/Japan 5-speed 931 "G31/02" transmission's serial number should be "31 02 00001" - the last 5 digits being the manufacturing sequence number. The same transmission with a factory installed LSD would have "(12)" added to the end of the serial number, so would look like - "31 02 00001 (12)".
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Paul · Posted: Mon Jul 25, 2005 2:00 pm Post subject:

Learn something every day....

numbbers · Posted: Tue Jul 26, 2005 9:37 am Post subject:

The serial number is stamped in to the bottom of the center rib of the trans. You will see an area directly on the bottom of the rib, that has been groung flat. Clean all of the grease off of it, and there is your serial number.
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1980 924 Turbo

Jazzerpet · Joined: 07 Apr 2003 Posts: 186 Location: Omaha, NE.

Serial # 31024404/12
So I guess it is an LSD.
My car is stock, so I would imagine I wouldn’t notice any difference by installing it.
Is there much call for these?
_________________
1980 931
1985 ½ 944
Member of the “Omaha Crew”

kaffine · Joined: 13 Jun 2003 Posts: 644 Location: Las Vegas

If you decide to sell it let me know how much I may be interested.
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80 924
80 931

The best desciption of an atom boils down to something unknown is doing we don't know what.
Sir Arthur Eddington

Paul · Posted: Thu Jul 28, 2005 1:39 pm Post subject:

You will notice a difference in the winter!