The Goat... if you are WOT in tall grass you will put too much strain on the diff cups as well as the engine eventually.. The diff cups are meant to be the weak link in the system so they will break before more expensive components fail.. I have forund that the best way to keep them longer is to make sure that the dog bones and cvd are in correctly and to the right depth.. also, I lowered the ride height of the truck and guess what, no more broken cups.... I now break cvd pins instead, but thats another story..