What size rear diff do I have (2 wheel drive). My 93 truck has a 4.9 (6)and 4 speed auto and a 6600# spring. I am trying to buy a locking diff, but need to know what size 8.8 or 9 without taking it apart. Thanks for any help..

 

It is an 8.8 inch rear end.

 

To double check, roll under there and there should be a metal tag that has that info on it too.