I'm planning on putting a 12v in mine aswell. Probably with a 4l80 behind it. I have a buddy who has a '90-ish w/ a Cummins. It was his dad's, then his big brother's, then his other big brother's, and now it is his. It has had the turbo turned all the way up since they bought it, and they have rolled it 3 times... still the same engine. :head: