2000 Chevrolet Silverado 1500 Q&A
2000 Chevrolet Silverado 1500 Question: 4WD will not disengage
I would get the diagnostic codes checked, it's possible the transfer case shift control switch has failed, but a diagnosis should reveal that. - Bret Bodas
We just added this article last week, hopefully it will help you with your 4wd issue: http://repairpal.com/gm-4wd-warning-light-issues - Oakman
My 2002 Chevrolet Silverado 1500 extended cab V8 1/2 Ton 4WD with Floor Mounted 4wd shifter, will sometimes stick and not disengage from 4wd back to 2wd. Also makes noise.
my driveshaft for my 4wd will not move freely when in 2wd and makes noice while driving