I don't believe that there is any way to permanently disable it because it is required by Federal Motor Vehicle Safety Standards. That is why the AdvanceTrac w/ RSC button allows disabling to occur only below 25 mph. Electronic Stability Control will save between 5,300 to 9,600 lives and prevent 156,000 to 238,000 injuries in all types of crashes annually once all light vehicles on the road are equipped with ESC.

With AdvanceTrac w/ RSC, there is no need for limited slip differentials, the brake applied on the slipping tire works way better at tranferring torque to the non-slipping wheel than any LSD.

The Owners manual has a way to solve your problem on page 262. If you press the AdvanceTrac w/ RSC button, you disable engine power reduction and get only brake application on the slipping tires. As stated above, this actually performs better than a limited slip differential, and it will do it on both front and rear diffs.

If you press and hold the button more than five seconds it disables brake application, too. But, then you would have open diffs front and rear making acceleration in snow more difficult.