it just started doing this and i cant figure it out. when i come to a stop and the truck rocks back to settle and it thuds. if i take of suddenly it thuds. it feels like its in the rear end but i cant be certain. almost like axle wrap but the opposite. not sure how else to explain it.
Not sure if you have a crew cab or not. But I had the same problem. It was the carrier bearing in the rear 2 piece driveshaft. Its in the middle of the two mounted to the frame. Kodi
Put the truck in netural , block the wheels and get under it and push on the drveshafts. If it has slop. it needs to be changed
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