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What could it be

(1999 Chevrolet Silverado 1500)
in Ryan, OK on March 25, 2017
4x4 selector shows 2 wheel drive when switch to 4 wheel high light flashes on dash. when i put it in 4 wheel low it comes on and stays on but can go back to 2 wheel drive. the front drive shaft will not turn in 2 wheel drive
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Popular Answer
on March 25, 2017
You may have internal transfer case damage, the fluid is too dirty for sensors functioning, or the ECU is faulty.
Have an auto parts store scan it, if you can get it there without driving 4lo on pavement.
If there is an electronic issue, there will likely be codes, if not, sounds like a gearing issue.
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