I just bought a 01 GMC 2500HD CC 4X4 SWB D/A, with 80,000 miles. On my drive home, around 72-MPH, I can hear a very slight winning noise. What's weird about it is it comes and goes. It only does it at a light throttle, and it seems to go away if I hit a bump. It will then eventually come back. I'm wondering if it could be the center support bearing. What are your thoughts? I do have the extended bumper to bumper warranty until 100,000 miles, so I need to get it fixed soon.
Thanks, Steve

I also have noticed this with my new truck! Any insight from anyone who has dealt with this issue in the past?

sure it isn't your TURBO?

sure it isn't your TURBO?
No it's defiantly in the drive train.

any change with truning slight right or left with the wheel?

any change with truning slight right or left with the wheel?

No change. It'll go away by itself, I can let off of the throttle, or hit a bump and it'll go away. Yea I tried the ole-swerving trick thinking that it could be a wheel bearing.

I don't know if this would be the same with the HD, but my 2000 1500 chevy did that (sounded almost like a city bus). Turned out my rear diff was almost out of fluid and the the whole thing finally made a bang one day. Expensive way to find out about maintenance.

Check the U-joints, had a similar noise at that speed, there also was a very slight grinding sound when comming to a stop. If its not the u-joints check the rear suspension and make sure it has not sagged. Incorrect offsetting drive line angles through the u-joints can cause a drive line drone or vibration.

Check the U-joints, had a similar noise at that speed, there also was a very slight grinding sound when comming to a stop. If its not the u-joints check the rear suspension and make sure it has not sagged. Incorrect offsetting drive line angles through the u-joints can cause a drive line drone or vibration.
Good point, I'm also noiced a "clonk" when I take off.
Thanks, Steve

Lost, I know this is off topic but do you mind telling me what you paid for the truck? I'm in the market and trying to get a feel for prices.

i also notice a noise with increased speed, im going to replace u-joints some weekend when it doesnt rain up here. something i was going to do anyways.

Lost, I know this is off topic but do you mind telling me what you paid for the truck? I'm in the market and trying to get a feel for prices.

$23,500

ok ive had a few problems with my truck i rasied the torison bars(dont do it) , Bad wheel bearing make a click sound like you got rocks in the tires its a steady click slower when u go slower and fast... you get the point...

If your increaseing the throttle and then let off and it goes away its your turbo... If its makes a hissing sound, If not it could be your ether front end or Rear End.