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2004 gmc
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26,181 Posts
It might also make a pop/clang noise because of torque build-up in the drivetrain. The hollow driveshaft acts as a gong.

Doing a 4WD test on dirt or gravel is recommended, not pavement. And to remove torque build-up for the safest possible disengagement, drive in a straight line back and forth a couple of times for 50-100 feet. But it's not critical. The system can take it, as long as you're following the Owner's Manual requirement to not do it on pavement.
 

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2006 chevy trailblazer_ls
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118 Posts
Yeah...I used to get that when I exercised my TC every week. Now, since I have a gravel driveway, I just back up a few feet to unload the drivetrain. Also put it in neutral when switching out of 4LO. Makes a happy sound.....Good luck.
 
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