What gears should I run with a 454 engine without excessive rpm's on the highway since the powerband for these engines is around 2200 - 2600rpm if im correct. I have a TH350 and 37"tires, also a 14 bolt in the back and open a 10 bolt in the front. Im thinking either 4:88 or 4:56? I do however want decent gas milage since there will be alot of highway driving involved. Also are 4:88's to small for a 10 bolt?