Well I just about wrote a small book on the olds rear from 1957-1996 and it was all deleted upon a pm . How did that happen? I will give it a shot again tomorrow evening. Have a cold and tired. Talk tomorrow.
Here are some links to pass the time.
http://www.442.com/oldsfaq/ofdif.htm#Differentials
http://www.oldsmobility.com/reardiffs.htm
Jim