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Chevy
Chevy, Chevy Mechanic
Category: Chevy
Satisfied Customers: 451
Experience:  15 Year as an auto mechanic and technician.
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2002 Chevy: Z71..accelerate..It goes away when I hit 35 to 40 mph

Customer Question

My 2002 Chevy Silverado Z71 is making a squeaking noise while in drive. The noise increases in frequency and pitch as I accelerate. It goes away when I hit 35 to 40 mph but returns as I slow to a stop. It doesn't make any noise when in reverse, only in drive.
Submitted: 8 years ago.
Category: Chevy
Expert:  Chevy replied 8 years ago.
HiCustomer Thank you for asking your question on JustAnswer.

Is the noise timed with the speed of the engine or the speed of the truck?
Customer: replied 8 years ago.
The noise seems to be timed with the speed of the truck. It increases steadily as I speed up until it goes away. It doesn't seem to fluctuate with the RPM's as it shifts gears.
Expert:  Chevy replied 8 years ago.
I forgot to ask if it'sXXXXX
Customer: replied 8 years ago.
yes it is four wheel drive, but i haven't used the four wheel drive since it started making the noise
Expert:  Chevy replied 8 years ago.
I'm suspecting that it's the pinion gear.
Customer: replied 8 years ago.

The pinion gear? That's in the rear differential right? I just had all of the components in the rear diff replaced.

Expert:  Chevy replied 8 years ago.
I mean a bearing noise... does it sound like it's coming from the transfer case?
Customer: replied 8 years ago.

It does sound like it's coming from the transfer case or transmission area.

Expert:  Chevy replied 8 years ago.
I need a new computer...

Anyway, my next thought was the front end of the u joint drive shaft (bearing).