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My 12 Ram 1500 5.7 with 4,900 miles also has a thump when stopping but not all the time. I notice it about 2 to 3 seconds after being fully stopped. Took it to the dealer and of course it wouldn't do it then. The head trans guy said it might be the trans shifting down into first after being stopped. I figure maybe the computer doesn't let the tranny shift all the way down in case you aren't staying stopped for a while to prevent giving it gas in mid shift but what do I know. Other than that there are no problems with it that I have noticed.