# 99 GMC Sierra

**URL:** <https://community.cartalk.com/t/99-gmc-sierra/7297>\
**Category:** Maintenance/Repairs\
**Created:** [November 15, 2007, 5:07am UTC](https://community.cartalk.com/t/99-gmc-sierra/7297 "2007-11-15T05:07:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![dcforester1](https://avatars.discourse-cdn.com/v4/letter/d/a3d4f5/32.png) [@dcforester1](https://community.cartalk.com/u/dcforester1)\
**Post date:** [November 15, 2007, 5:07am UTC](https://community.cartalk.com/t/99-gmc-sierra/7297/1 "2007-11-15T05:07:15Z")

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My 99 1/2 ton pick-up with 99000mi makes a grinding noise in the rear end when going over bumps. Not all the time, I am not sure if it is the spyder gears or something else other than that everything else sounds OK