4 wheel drive not working

Hello,

It sounds like the encoder motor is going out. Here are instruction and diagrams to help you replace it below:

INSTALL OR CONNECT
1. Any gasket material remaining from the motor/encoder.
- New motor/encoder should have a new gasket attached.
2. Four bolts securing the motor/encoder to the transfer case.
- Ensure the motor/encoder aligns properly with the transfer case interior shifting components.
- Align the motor/encoder mating surface detents with the transfer case mating surface detents.
- Tighten motor/encoder bolts to 25 N.m (18 lb ft).
3. Wiring harness connectors to the motor/encoder.
4. Transfer case shield.
5. Negative battery cable.
6. Perform a functional test on the electronic shift select system to test the motor/encoder.

Check out the diagrams (below). Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

Okay thank you. So it is the actuator?

Okay, I have a 1999 Suburban will the parts interchange?

And I see now what you were talking about. Thank you

It should work if the parts numbers are the same. Please let me know how it goes.