The weight of the truck shifts to the rear which raises the front end. It raises the front end enough that the front wheels have less traction than the rear wheels and all of the engine power gets transferred to the front. I am still running the grease filled diff's, so power is going to be delivered to whichever wheels have less traction.

As far as how much the front tires balloon... If 0% ballooning is when the truck is parked, and 100% ballooning is about to shred the tire, then i would say it's about a 35% - 45% ballooning.

These tires bite into the dirt really well, thats why i was considering a thicker rear diff oil such as 5K. I would like to get just a small about of oversteer under power. I've already tuned the brakes to do this under braking, which works really well for me.