any GM midsize rear like malibu, monte carlo, s-10 or nova will work,I used a 85 s-10 rear from a 4wd in my 46 1/2 ton,and it works great, i still have my 216 engine in mine, but I have a t-5 tranny in mine and i run it 60mph plus everyday back and forth to work, im in the middle of building a high performance 235 at the moment for my truck,.....also have you thought about you're lug pattern? you'll be going from 6 lug to 5 lug in the back,you're gonna have to change out the front too I did mine already, let me know, I have an easy way to change the front
Last edited by hoozat; 02/12/2013 7:13 PM.