well today after work, ill be swapping my 3.54 rear diff to a 3.90 rear diff. wish me luck

 

Sweet! Did you get the 3.90 tranny speedo cog too? Don't want your speedo readings way off....

 

Anything wrong with the 3.54? Want to get rid of it?

 

yes i have spedo gear my friend that sent me the diff is awsome, and the rear end has i belive a crash collar spacer is fried i dunno for sure i dont want it im going to throw it away it makes alot of noise and rattles