I've fixed a bunch of chevy 4x4 problems and have never seen this problem. If the front axle actuator and transfer case motor work in auto mode, they should work in 4 hi or 4 low. The entire system is controlled by the transfer case control module. Makes me think that might be your problem, although I've never seen a bad one.

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    Answer: You really need to get the transfer case system scanned for codes if you have not already. That may give a clue to what system is having a problem. This is because this problem that comes and goes- could be a problem in the transfercase control module, the encoder motor on the transfer case, or just in the switch. All 3 are pretty common.

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    Apr 20, 2020 · Problem with your 2008 Chevrolet Silverado 2500 HD? Our list of 16 known complaints reported by owners can help you fix your 2008 Chevrolet Silverado 2500 HD. When I placed the truck in reverse, there was a whining grinding noise. When driving, anything over 10mph causes grinding whining noise. If I take it to speed and drop to neutral, no grinding. shifts from 1-4 fine no problem, outside of the grinding. Thought it may be it was a problem with the transfer case. I pulled the transfer case out.

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