When I pulled the front passenger tire while installing a lift kit I discovered a wart on the passenger side of the front axle. After looking in my chilton's manual I discover this is a "shift motor" and a 4x4 sensor. The shift motor has a couple of vacuum lines going to it and the 4x4 sensor has a couple of wires that controls the 4 wheel drive light (mine is always on
). The shift motor is suppose to couple the front axle when in four wheel drive. Now I'm confused
Doesn't the transfer case disable power to the front wheels when not in 4 wheel drive?
Isn't there a differential in the front axle that allows the wheels to turn at different speeds when cornering?
If so, then why is the axle on the passenger side split with a mechanical coupler used to connect it? It seems this is redundant?