Where do these engines like to cruise at? I will have 36s and 4.10s wich i think should put me around 2500 - 2750 rpm doing 60. That seams like alot to me and it also seams like it will be suckin down the gas real hardcore like. I have a freind that has the same axels i do only his has 3.73's He would trade me but i dont know if i should. And yes im just running a th350 which i know will be on borowed time either way, but do you think 3.73's will kill it any faster than the 4.10's? I do have a bigish tranny cooler (about a 12X12 standard tranny cooler). I do drive sane but im not real easy on the throttle.