If the transfer case does not engage the front driveshaft, there could be a problem with the TCCM or encoder motor. Engine at idle, trans in neutral, 4WD selected: The vacuum line at the axle actuator under the battery must have manifold vacuum. If it does, make sure the cable pulls in about 1/2" to 3/4". If the cable pulls in, the right front wheel should lock in. If not, the clutch mechanism in the axle tube needs attention.
You have to know how it works,
to figure out why it doesn't.
Last edited by Captain Hook; 05-30-2012 at 03:00 PM.