I know ya'll have heard this question thousands of times but i havent found the answer im looking for yet. I got an '86 Silverado long bed thats stock right now. In the near future its getting a 400 small block and a rebuilt tranny (TH350, the one in it only has 1st gear. While out of commision I'm putting 4 inches under it and 33" TSL's and have been wondering bout my gears. I did the calculator thing on 4wheelparts.com and they suggested 4.10's, what do you guys think? Its a semi daily driver and will see 60-65 often but nothin over that.