57 truck 235 with a T-5 and 3.55 gears in a 37 1/2 ton,it seemed like it done better with the original 3 speed and 4.10 gears so I played with the jet size and installed softer power valve spring and its better. I am thinking those engines were designed to be screaming going down the road and gas mileage was not that big of concern back then so probably a waste of time and money but would like to to do a little better,I was told that the cam was changed in 59 for better low end torque and do have a 60 car 235 so would that be the one to use and work from.
