# What is this horrible sound my GMC Suburban makes only in reverse?

**URL:** <https://boards.straightdope.com/t/what-is-this-horrible-sound-my-gmc-suburban-makes-only-in-reverse/732973>\
**Category:** Factual Questions\
**Created:** [September 29, 2015, 7:35pm UTC](https://boards.straightdope.com/t/what-is-this-horrible-sound-my-gmc-suburban-makes-only-in-reverse/732973 "2015-09-29T19:35:32Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![Rick](https://avatars.discourse-cdn.com/v4/letter/r/9f8e36/32.png) [@Rick](https://boards.straightdope.com/u/Rick)\
**Post date:** [November 8, 2015, 9:13pm UTC](https://boards.straightdope.com/t/what-is-this-horrible-sound-my-gmc-suburban-makes-only-in-reverse/732973/21 "2015-11-08T21:13:07Z")

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> [@Isilder](#):
>
> I agree with many previous posts…
> 
> Why doesn’t it happen all the time ? well It could be both a brake problem and a mount problem. The brake problem may occur sometimes… the pads jam on and then its hard to push in reverse… they come off when you go forward. The bad mounts could be for the engine or for the transmission, but either way its causing something to rub badly.
> 
> Or it could be a problem with the mechanism (pawl) that clicks in with “P” to lock the vehicle at one spot, its half clicking in with R problematically.

Listen to the video. It’s NOT brakes or the parking pawl since the noise continued after the vehicle was no longer moving.  
It has to be engine related.

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