Vibration

[MTSnowboarder]

New to the forums but I've been a lurker for a while, I did some searching but couldn't find anything similar.

 

I have a 2000 Sierra 4WD with 135k miles on the 5.3, it is lifted 6" and on 35s.

 

I have vibration while accelerating in low rpms, 1500-2000 or so, at low speeds(0-20ish) and vibration while decelerating in the same rpm range, regardless of speed. If I stay on the gas slightly while slowing it doesn't vibrate. Vibration is bad enough that it could be compared to running over rumble strips on the side of a highway. There is no noticable vibration when cruising, or accelerating at higher speeds.

 

It also clunks when shifting from neutral to 1st or reverse from a stop but if moving slightly, 1mph or less while shifting it doesnt clunk. There is no grinding or whining noise while driving or stopped.

 

What could cause this? What should I check to help determine what the issue is?

 

Thanks

[jim brock]

I'd probably start with the U-joints. Bad UJ's can cause vibration at various speeds but mostly under load accelerating or decelerating. If the vibration goes away when coasting that might be it. Good Luck.

 

Jim B.

[98trck]

if You ever took the drive shaft slide yoke apart , maybe to clean and grease it ,the u-joints on each end of the drive shaft MUST be paralell to each other if not that will produce a vibration

PETE