Thanks for the link. It seems like the rear end doesn't really matter. There were some Bins that said 3.08 and 3.42 and others said 3.42 and 3.73. So correct me if I'm wrong. So all memcals will...

I meant to type BJYX

The truck is a 1995 GMC put a 5.7 in, has m30 (4l60E), GU6 (3.43) and if anyone know a different chip that will work. These are the only 2 I see that will work with this set up in vehicle.
Thanks

Looking for a BPUX or a BJYK