just got my parents truck back from dealer. they just installed a new short block. said old motor was shot. truck only had 24000 miles. but now that they got it back it still is making a pinging rattliing noises in the motor like it still hs bad injectors. and also truck gots a bad vibration throughout the drivline now. they are saying the rear diff is bad? can sit there in park on the truck and rev it up and can still feel vibration. #@$%! any body got any idea.