Audi Gearboxes

Does anyone know the model designation of the transaxles used in the RS6/RS4 cars? Both of these cars seem to have good ratings for gearbox shifting quality, and I wonder how involved it would be to remove the center differential and put a new endplate on?

THinking it might be an alternative to the exceedingly rare (and expensive!) G50/50/52.

http://elektro.cmhnet.org/~charlie/photos/cars/01E/trans.html

Here is a site that lists the various transmissions and what vehicles they come from. There is also detail info on how to convert 4wd to 2wd.

If you search under library & Mark Worthington published a spreadsheet and gear chart for the various 2wd alternatives. If you cannot find it PM me and I will forward it too you.