When I let off the accelerator there is a whining noise

JOHNSON9609

MEMBER
2007 CHEVROLET AVALANCHE
5.3L
V8
2WD
192,000 MILES

Recently installed a drive shaft. Now reverse is very sluggish and almost act like it doesn’t want to back up. Also, when I’m riding down the road the truck runs great but when I let off the accelerator a whining noise starts and if I push the accelerator down again the noise stops immediately. Any ideas?

3 Replies

JACOBANDNICKOLAS

MECHANIC
109,705 POSTS

Hi,

When you replaced the drive shaft, were the universal joints also replaced? Did everything align easily for you?

Let me know.
Joe

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Thursday, November 28th, 2019 AT 8:06 PM

JOHNSON9609

MEMBER
2 POSTS

The u-joints weren’t replaced and no the alignment wasn’t easy at all.

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Thursday, November 28th, 2019 AT 11:50 PM

JACOBANDNICKOLAS

MECHANIC
109,705 POSTS

Something is either different, went together wrong, or you have bad u-joints. It really shouldn't have been difficult. Are you certain the driveshaft that was used is the same as the original? Also, here is a link that explains how to check u-joints:

https://www.2carpros.com/articles/how-u-joints-work

Removal and replacement directions:

https://www.2carpros.com/articles/how-to-remove-a-drive-shaft

Let me know if anything in the links help.

Take care,
Joe

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