GMC Troubleshooting Questions? Ask a Mechanic for Answers
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
My info is showing that your 4wd system on this model is electronically shifted using a transfer case control module and electronic actuators on the front differential and transfer case.I only show vacuum diagrams for the heater and ac system and the emissions system.In the link below is the diagram I show for this model here.If this is not the diagram you need here let me know.