If you're going to make a car hauler why are you lowering the carrying capacity. Why not leave it as a 1-1/2 ton truck? If you want higher speeds add a overdrive unit or put a 2-speed rear in. My 2-1/2 ton wrecker with a 350 SBC, SM420 trans and a 2-speed rear will run 70+ mph. My fire truck will run in the low 60's after I swaped in a 2-speed rear...before the swap it would max out at 53 mph. I paid $250 for the fire truck 2-speed rear set-up.
Mike B
