My front drive shaft is locked with the front axle and is turning all the time even though the shifter is not in 4x4. IIRC, nothing locks up until the TC is shifted into 4x4 mode and the electric actuator on the front diff locks the diff???? I noticed it when the front wheels were on the ground and I tried to turn the shaft. Locked up solid. What in the TC and/or diff is being prematurely worn out by this??