Changing mods required different gearing. I had the stock 3.08's, then 3.73's for a couple years when I just had bolt ons, and then went with 4.10's with my current heads/cam setup.gts95 said:thanks for the tips.... 4drss, why have you had to do three sets of gears? Did you upgrade your posi unit also? Mind me asking what they charged you? I was really looking for something a little closer to where I live but might give them a shot.