I have a 05 drw with 38000 miles and it has a shudder or vibration ( #@$%! )when you are slowing down. There is no significant other vibration until I hit 68-70 . I took it to the dealer @ 35000 and he said the u joints were fine? I climbed under and i can rattle the rear driveshaft and hit the center plastic guide?. Is it normal to be able to do this? Thanks for replies.