So I purchased a 2001 3500 truck has 256k. Purchased from the owner of a diesel shop in the area says it has a revmax stage 5 kit in it with billet convertor. He gave me a receipt and all that jazz. However its having a hard shift from 2 to 1. If I roll slowly to a stop sometimes you can feel it bump sometimes its smoother. If i rapid stop about time the truck would rock stopped it jars the truck pretty good. Almost feels like a car bumped me from behind. So anyone here have any advice ? Or know the best place for diagnosis around the Charlotte area? Of course I've googled.... I have replaced the temp sensor I have lubed the driveshaft I've left the batteries unplugged hoping that would reset the ecm tcm.