When shifting into 4 wheel drive the front wheel drive does not engage. I can turn the front drive line and the right axle will turn as it sits ont the ground, I didn't check the passenger side and I did not jack it up so front wheels were not off the ground. Is there some kind of diagram that shows how this system works, or whats the answer?
Check the vacuum servo that controls the front hubs engaging. The servo cable may have broken. Also check the vacuum at the servo hose. When you shift to 4 Wheel Drive. Vacuum is sent to the servo to engage the front hubs.