Well I had the truck back for a bit ,but was still hearing a clunk going over bumps.. so we looked under it and found the transmission/transfercase mount was not bolted in, and the mount smashed... back to the dealer to get that fixed as well....that would explain why the rear u-joint went bad in 27,000 miles, with them moving around and puting things in a bind. now we will see how it is after all is fixed.