I have a 86 Audi 5000 Turbo with 3 spd auto that's gone bad. Tranny code "RDU". I've been offered a "RDE","RDN",and a "RDX" for free.....will any of these work? Which one is closest to "RDU"? Any and all advice appreciated....

I think that this should shed some light.

http://www.gtainc.biz/products.htm

Thankyou....that did help.......