# Chevy AWD problem

**URL:** <https://community.cartalk.com/t/chevy-awd-problem/6107>\
**Category:** Maintenance/Repairs\
**Created:** [October 18, 2007, 3:13am UTC](https://community.cartalk.com/t/chevy-awd-problem/6107 "2007-10-18T03:13:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dapopo38](https://avatars.discourse-cdn.com/v4/letter/d/da6949/32.png) [@dapopo38](https://community.cartalk.com/u/dapopo38)\
**Post date:** [October 18, 2007, 3:13am UTC](https://community.cartalk.com/t/chevy-awd-problem/6107/1 "2007-10-18T03:13:55Z")

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I have a 2002 Chevy Trailblazer LTZ 4WD. When I shift from 2WD to AWD I notice a clunking noise/ (on a smooth road it feels like bumps) when I shift into 4WD the problem goes away. It only occurs in AWD

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**Author:** ![andrew\_j](https://avatars.discourse-cdn.com/v4/letter/a/91b2a8/32.png) [@andrew\_j](https://community.cartalk.com/u/andrew_j)\
**Post date:** [October 18, 2007, 12:06pm UTC](https://community.cartalk.com/t/chevy-awd-problem/6107/2 "2007-10-18T12:06:12Z")

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Do all your tires match in treadwear/make/model/size?

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**Author:** ![Roadrunner](https://avatars.discourse-cdn.com/v4/letter/r/d2c977/32.png) [@Roadrunner](https://community.cartalk.com/u/Roadrunner)\
**Post date:** [October 18, 2007, 8:46pm UTC](https://community.cartalk.com/t/chevy-awd-problem/6107/3 "2007-10-18T20:46:38Z")

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Check to ensure the transfer case electronics are good. Are you making this mode change while stopped or under 3 miles an hour?