I have a 2005, 1500. just looking for something a little bit better than what I got but nothing insane, LOL. I don't know much about the gears in the rear end of the truck but the ones I have right now are "whining". I opened up the rear diff to look in and everything looks good. No metal shavings in the gear oil. Somebidy says that it may have just built up a groove in the rear end gears. Once again, don't know too much, that is whay I am hear asking. Thanks for all input.