96 Yukon won't disengage from4 wheel drive
Most common is a bad transfer case shift motor, try this: turn the key to on, lightly tap on the transfer case shift motor as someone holds the shift button down for 2WD if you hear the motor run and you are in 2WD then the motor is getting bad, if you don't hear the motor run then you need to test for signal power from the 4X4 control unit.
put it into reverse (and in 2wd) and drive backwards. if you dont feel a shift from 4 wheel to 2wd then do it again.
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