vibration at slow speed

[RProvence]

I have an 04. 5 3500 4x4. I bought it new, and it has been trouble free. However the truck has recently developed a vibration at about 15 mph . This occurs mainly when I am slowing down. It does'nt matter wheather the clutch is engaged or not. It almost feels like the anti-lock brakes are pulsating,even when I am not braking. Does anyone have any clues. It's still under warranty with only 21000 on it. Thanks for any feed back.

 

[Slow Six]

U joint, quite likely the rear drive shaft. Front drive shaft and then axle joints will be next. There are a lot of posts on these. If you do a search you will find a lot of info.

 

[Task125]

I second the U joint

 

[RProvence]

U joint, quite likely the rear drive shaft. Front drive shaft and then axle joints will be next. There are a lot of posts on these. If you do a search you will find a lot of info.

it was a U joint. I can't believe one has already gone out at 21000, but that happens. Warranty fixed this time. sorry it took so long to reply. Thanks for the info.