audi 90 differential oil

["Jevon B. Dade" <jdade@usibr01.usi.edu>]

I wa looking on the Eurocarfinder page and saw that a member that owned a 
1990 90 had his differential fluid replaced because of a recall. i looked 
in the archives for more info on this, but I did not know exactly what to 
look for. i asked this question because I have an '88 90 that does not 
want to drive. it was running fine when sudenly it seemed to slip out of 
gear. I stopped and put it in park and tryed to go again, but it would 
not move in drive, reverse, or 1 and2. It sat in my garage for a week and 
when i went outto see if it would go  it did, but only halfway around the 
block. I tried to go again and nothing happened. I called the local 
import service shop, and they said that they had heard about the 
differential fluid either evaporating or leaking out on the 80/90 series, 
but they didn't say which years. I called the dealer, and they wouldn't 
tell me anything unless i brought it in. 

Any help or answers would be greatly appreciated.

j. dade