In a desperate search for a transaxle to replace the weak and feeble Renault UN1 in my Lotus Esprit Turbo, I have done some investigation into VW/Audi alternatives. The attached spreadsheet lists all of the 012 and 01W 5 speed transaxles used in A6/A4/Passat up to 2000, but they were used up to 2004 with codes beyond those listed. The highest engine torque these boxes transmit in Audi/VW applications is 310Nm. The ratio data is from Audi workshop manuals zo iz gut!
These boxes feature frequently on ebay (Jan'2010) and would suit applications that do not exceed 310Nm peak torque.
Note 1) boxes built after 11 Jan 1999 have stronger diff and pinion bearings.
Note 2) all boxes in the 012/01W range are identical except ratios, regardless of their application.
Note 3) Max. clutch diameter is 240mm.
Unfortunately, I had to limit the useability of the spreadsheet to accommodate forum file size.
Hope this is of some use.
Bill.