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I have slack in my rear differential which is supposivly common? It makes a awful noise, clunk. Im wanting rear disc in the rear and maybe something a bit tougher in the front. I was just kind of wondering what everyone is running if they have done any upgrades pertaining to this?

Not that I could smell. its really weird.

yea. by time i got it to that guy i had put some miles on it so it was binding up and i think he just thought it mght be that. but I wasnt to suuure. it was almost like it was stuck in 4 lo.

suprisingly its still pretty read and shows no signs of any kinds of composites in the fluids.

First post here! I have a 1999 GMC Yukon SLT 4wd with autotrac and ltd slip. I was driving down the highway the other say at about 70 mph and notice my rpms changing erractily. Well since then it has gotten worse. The truck now wont go over about 45 and that is with the gear selector in...