Help ... Rear-End interchangability

[70BLAZERX2]

just find a pre 78 chevy van and get the 12bolt out of one of them..its a bolt in..I have done several...olny thing is those years liked to run a 2.73 ratio...or a 3.08...,if you do the pull it thing..pull cover and find a good gear..

Hint look under the hood on pre 78 chevy vans ..the rear ratio is on the option lable on driver side of hood bottom.

12 bolt is a way better axle..will fit 71-94 cans..95 up went to abs ring on rear end gear.