Yes, you can change between 4WD, auto or 2WD at any speed. Only when setting LOW 4WD you must stop. Remember, when you set this position you only can drive straight.
Turn real sharp while moving and see if you feel the front wheels jerking
NO !
mine died because of a faulty fuel pump
Start with changing the fuel filter.
You Probley have a blowed head gasket.
Check fuel pressure, fuel pressure regulator.
Why will my abs break light and seat belt light stay lite on the dash of a 2003 chevy Tahoe while the motor is running? Please help. Thank you.
Yes, it is a shift on the fly system.
Yes. It prevents the motor from from turning over while in gear.
Yes, You can only shift it into 4 high while driving. You can not shift to 4 low while moving.
Possible bad fuel pump, fuel pressure regulator. Give more symptoms
Yes. The switch prevents the car from turning over while in gear.