tapping noise under truck

By deepstuff
January 19, 2019 in 1999-2013 Silverado 1500 & Sierra 1500

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deepstuff

Posted January 19, 2019

Happens after warm up. Goes away for few minutes if I shut off and restart. Doesn't change with engine revs, gear, 4wd or 2wd. Don't notice any change in way truck drives. Sounds like maybe a solenoid or relief valve opening and closing?

2007 NBS Vmax 4x4

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