The front end has a differential in it meaning that the torque will be transferred to the wheel with the least amount of resistance. Basically if the left side is stopped or has more pressure against it, the power will be sent to the right side and turn that drive shaft.

My suspicion is that the vacuum hubs you have are not engaging completely because they are dirty, or the seal is torn. This is a known problem with the Sportage and the Warn manual hubs address it. You still have the differential action that will occur unless you put a traction aid in the front like a LSD (Limited Slip Differential) or locker of some kind.

The rear end of the Sportage works in the exact same way unless you have the LSD in it.

Logansportage <img src="/forums/images/graemlins/patriot.gif" alt="" />

White 1998 4 door KIA Sportage 4x4 w/Eibach 2.5 spring lift and TJ rear coils, 4crawler 1.5 body lift, Monroe Sensa.trac shocks, Bosch 4+ plugs, Eaton LSD, 31x10.5x15 BFG KM tires, 2.5 cat back exhaust w/SpinTech muffler