02 Silverado 2500HD - strange noise

[wakruem]

I have a 2002 Silverado 2500HD that is making a strange noise (high pitch) which appears to be coming from the drive shaft area. The noise starts as soon as I put it in drive and then appears to fade away, once I get up to a certain speed and then returns again when I slow down. I don't hear the noise in reverse. Someone mentioned to me yesterday that the CV joint may need to be greased. Not sure if there is a grease fitting for this. Does anyone know? Could it be the CV joint causing this? Does anyone have a idea as to what it would cost to get this fixed by a service center?

[masapell]

Interesting! I had a similar problem with my 1500. It would happen at low speeds, between 20 and 30mph. It was a hum that was really pronounced when letting off the gas and decelerating, but would also do it during acceleration. I took it to the dealership and had a friend keep it for several days. Of course, they could not duplicate it, though it happened several times with my friend, myself and a tech. in the truck before I left them the truck. I was told it could be an air leak from the window, or air making something on the outside whistle. None of the possible causes were logical to me, so when I got it back, I put the truck on jack stands. I then put the truck in gear and listened underneath the truck. I could hear the vibration strongly in the frame, near the engine/transmission. Again, it was at about the same low rpm. Well, after giving up on trying to find it (I thought, if something broke, then I would definitely know what the problem was!), it went away. I have not heard it in about a year. I know that I did not help your situation at all, but I thought that I would throw that out to you. I hate having a problem that is intermittent. It's easier if it just breaks, so you know what to fix. That's my story, and I'm stickin' to it!!

[isie]

check your universal joints, the way you drscribe it thats where I would begin. I have seen this on a few trucks, the noise can go away to come back later when the u joint actually fails.

[masapell]

Originally Posted by isie

check your universal joints, the way you drscribe it thats where I would begin. I have seen this on a few trucks, the noise can go away to come back later when the u joint actually fails.

How do I go about that? I actually thought it might be the center support bearing, but was told by my dealership friend that it wasn't. When I first start out in the morning, especially when it is cold, I feel a good bit of shake, especially at the first stop sign in front of my house. I have grab the ends of the driveshaft, but only felt movement in the support bearing.

Sincerely,
Matt

[isie]

I personally changed them both (all 3 u joints and the carrier bearing) at the same time, the carrier bearing gets pressed on and off almost exactly like the ujoints, or if theres a machine shop , like napa they will do the carrier bearing ussually for $15-$20.

[masapell]

Originally Posted by masapell

Well, after giving up on trying to find it (I thought, if something broke, then I would definitely know what the problem was!), it went away. I have not heard it in about a year.

See, I quote myself to show you that if you don't "knock on wood", things happen!! So, since I opened my big mouth, the sound came back Saturday morning. That'll teach me a lesson!