I took my R/T to the dealer because it had a bad clunk in the rear end when I go through the gears, mostly after I accelerate hard and let off the gas right after I hit a new gear, mostly 2nd. I thought it was the u-joint but they said they where fine, after an 800.00 bill they said my posi is wore out and it would cost an additional 2,100 to fix it. I was wondering what posi to go with and how hard it is to do it yourself. And around the amount of time it takes to change it, if I’m going to replace it I’m definitely going to upgrade to a performance posi. Any help would be GREAT!