i got my truck back after a 1 month stay at the dealers. and the verdict is the valve body was sticking. i ended up with a new rear diff, new transfer case, and a new valve body. truck shifts great now much better acceleration. the only dumb thing is when i took off the 35" pro comp mt and put the stks on i didn't mark what side they were from so i get this loud metal rattling sound around 15mph and thought it was coming from my transfer case. come to find out it is the tires vibrating the running boards. put stks on no noise so now i have to sort out the tire problem.