i am new to this web site so if this question was already answered i apologize. I have a 02 2500 w/15000 miles on it. after the truck has been driven for a while or if it has a load on it and i come to a stop and then start out again there is a couple of thumps that come from the rear end, almost like something is draging, sometimes so loud that it feels like the tailgate dropped.it has been to the dealer and they said that it was the rear springs so i let them replace them but the problem is still there. it seems like it is coming from the diferential. If anyone has an answer or the same problem i would apreiciate the help. thank you