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Driveline rubbing the squel (forward gears only)?

jtstacy77

By jtstacy77
in Ask A GM Technician

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jtstacy77 Enthusiast

jtstacy77

Posted
Posted

Hey guys I have an issue with my 06 avalanche 4wd. It is making a sound sorta like a brake pad rubbing on a warped rotor, when I initially begin moving. No sound in reverse just in forward, under power. Once I pull out at any speed it is more of a loud chirping sound, again no throttle no chirp, give it gas and it starts again. Tried it in reverse one more time and nothing. Also the sound does not change with braking, I have tried applying different braking pressures while still giving it gas and no change in the sound. It sounds like it is under the cab, but hard to tell when trying to diagnose driving down the road with my door open! Also I have noticed a smell like burning oil maybe grease outside the vehicle after an extended drive. Thanks for any help, I appreciate it!

txab Senior Enthusiast

txab

Posted
Posted

Pull a 4 wheels and start inspecting. If you didn't mention a burning smell, I'd tell you to check your u-joints. What you describe can happen with them, I've had it happen to me. Noise under throttle. Nothing coasting. Nothing in reverse.

jtstacy77 Enthusiast

jtstacy77

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Posted

I appreciate the info. I got under the avalanche today and I don't feel any play in the ujoints. I did notice I could push up on the driveshaft and the shaft coming out of the back of the transfer case will move up and down about 1/4 to 1/2 an inch. Is this normal? If so I guess I will try replacing the u joints. Thanks again!

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