Vibration

[Bonzo219]

I have a 2004 2500HD 6.0 4.10. I get a vibration starting at 70MPH, peaking at 75 and going away at 80. It feels like its in the drivetrain. When it is vibrating, if I back off the accelerator, the vibration stops.

Had it to the dealer twice already. They cannot find the problem. It has only 6000 miles on it.

Any one have a similiar problem? Driving me crazy.

[beemer nut]

I have a 04' 1500 with vibration at or around 45 mph. I have about 7,600 mile on truck.

[truk993]

I have a 1999 Sierra (55K) with the same 45mph vibration. I've been all through the tranny, replaced u-joints, balanced driveshaft, tore apart rearend with no luck on finding the vibration. Finally led me to the front wheel hub assemblies. These have been a problem for our years of trucks, as they are sealed and commonly wear out. To check: jack up front and grab top and bottom of wheel and try to push back and forth in a vertical manner. If any play, suspect bad hub assembly. If so, I checked all prices with GM dealers, autozone, oreillys, etc.. Napa has best prices at $180 per side. Hope this helps.

[BoatCop]

Check the easy things first.

Vibration in only a specific range speed usually indicates tire balance.

Could have thrown a weight or have a defective tire.

[truk993]

Yea, thats what I thought also, until I purchased the '03 Sierra factory wheels to upgrade and put 4 different brand new tires on. Still shudders. Alignment seems to be correct. Wierd thing though, when it starts shuddering, I can throw it in Neutral and it still does it so its not the tranny, but it seems the shudder increases in intensity while going up hills. Also, a test i tried, when it starts vibrating, I hit the brake pedal just enough to make the light come on, this disengages the torque converter, but the shudder is still there. So anyways, I guess the only steps left are to change hub assemblies and check alignment. Other suggestions appreciated. Keep ya posted.
Chris

[sawyer]

Beemer nut, you might want to check with your dealer about the vibration , I had the same problem with my 04 sierra. There is a technical bulliten that covers this, the number is 02-06-05-003c they put a flex pipe inline on the exhaust pipe before it goes into the muffler and it fixed the vibration on my truck.

[BAA]

Can you tell me if the cause of the vibration was ever determied? I am having a similar problem now with my 2001 HD 6.0L

Bob in MI