If you've got a Ford engine and trans, Use a Ford Explorer rear. The standard S-10 rear in a 4 banger is 3:73. It's ok on take off, but poor highway speeds unless you've got an overdrive trans. I've got a 52 Ford on an S-10 frame with 3:42 rears. Not so good for impressing the ladies on take off, but much better speeds and MPG on the highway.