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4 or 5 speed?

Got a 78 924. Wasn't running, assumed it was the Audi 4 speed. Pulled transaxle. This one was mounted like a 944 box and based on the PET diagrams, is the Audi 5 speed that came later. Anyone have the part numbers for the two boxes, early Audi 4 speed, later Audi 5 speed? Thanks
Old 07-13-2004, 07:10 PM
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The early 4 speed trans looked similar to the later 5 speed trans. The early 5 speed trans was the snailshell design built by Porsche.

Major appearance difference between the Audi trans and Porsche trans is:

1. Audi design places the transmission behind the axle center line, the Porsche model is in front of the axle.

2. The Audi design has what appears to be a bellhousing on the front that mates to the torque tube. The Porsche design tapers down on the front and bolts directly to the tube.
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Old 07-13-2004, 08:19 PM
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Thanks for the reply. As it goes, I knew the differences between the Porsche (snail) and Audi units. What I need are part numbers and/or some definitive descriptors allowing me to tell the difference between the early (4 speed) and later (5 speed) Audi units. Based on the 924 FAQ and the PET diagrams, the early unit shouldn't hang from the upper crossmember like a 944 box but then according to those same sources, a '78 924 shouldn't have that crossmember. Mine did and my transaxle looks exactly like the 5 speed depicted in PET, not the 4 speed depicted there. So, is the FAQ wrong as to the crossmember? Was this 924 modified along the way? (Must have been good because I don't see evidence of any welding or patching). Or, is the FAQ wrong as to the crossmember and someone simply switched trannies? Or, are the PET schematics screwed and I have the 4 speed after all? Bottom line, I need part numbers, or definitive descriptors. Thanks
Old 07-14-2004, 04:05 AM
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If you have a 4-speed it's the Audi based one, the 5-speed Audi-based one looks just the same and can be installed in it's place. If you have the Porsche one, which has been previously described the rear crossmember is different. The part numbers won't help as there are no part numbers on the transmissions. As the 924 is 25 years old anything could have happened to it.

so: 4 speed = Audi based trans (the rear casing is shorter than the 5-speed so there is a bigger gap between the end of the trans and the spare wheel panel)

All the pictures you need are in the parts catalog and Haynes manual.
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Old 07-14-2004, 04:17 AM
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This transaxle has the Porsche number 477 599 131 stamped on it. It has another, smaller set of numbers/letters prefixed with a "K".

One thing mentioned in the previous post is the degree of clearance between the trans and the spare tire bulge. Is this in reference to the snail or is there a notable difference in this regard between the Audi 4 and 5 speeds? As noted, this box mounted almost exactly like a 944 box with no greater than an inch clearance with the spare tire bulge.

And, once again, I have the parts manual, microfiche, PET, etc. etc. The best pictures are the PET illustrations and as noted in the first post, my transaxle matches the 5 speed illustration, but all PET references are to REPLACEMENT transaxles ... I'm looking for other ways to more positively identify what I have.

Thanks
Old 07-14-2004, 07:51 AM
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If you have the trans out you'll see a code on the top of the "bellhousing". If it's a 4spd there will be a "YR" in the stamp or an "XT". The YR is the earlier trans up to '77.5 and the diff is 3.44:1. The XT is from '77.5-'78 and has a 3.89:1 diff. Otherwise they're identical.

The Audi 5spd will have a "VR" in the stamp.

Hope this helps.

-nick
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Old 07-14-2004, 08:35 AM
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Ahhh! A man with the answer. Thank you, thank you, thank you. I had saw the codes in my research and scouted the tranny but didn't see them. With your help, I took a wire brush to the bell housing and sure enough, there it was. TDC on the leading edge.

Thanks again.
Old 07-14-2004, 10:51 AM
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The easy give-away is that the 4-speed only has two castings and the 5-speed has the additional third casting. There is a signiifcant gap between the end of the casting and the spare wheel well on a 4-speed, on a 5-speed the gap is only about an inch.
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Old 07-14-2004, 06:51 PM
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