For those of you that think the front diff on the i4WD system is open it is absolutely NOT. It does not have side and spider gears like an open diff. The Face Cams (what take the place of the side gears) have ramps/cams and there are 16 followers (aka chicklets) between the face cams. When torque is applied, the followers are what are actually driven and they are wedged against both face cams pushing them out against a cone spring and causing the diff to bind up and force traction to both wheels. It works under the same principal as the Torque Locker just not fully locked. I can best describe it as a forced limited slip. Once this pseudo limited slip starts to slip, i4WD kicks in.
There are tolerances/clearances in the diff carrier that keep the cams and followers under tension/preload and in the process of re-assembling my diff, I found them to be way out of tolerance. The measurement on housing revealed the shimming was off by .4mm and this is causing very little preload on the cam/followers. I have ordered the correct shim and will put it together with the proper clearance per the service manual and see if that enhances the traction even more.