awd drivetrain, and play with the center diff (has to be LSD of some kind). have the base torque split be 0% to the front wheels, but adjust the locking and preload to get it to lock into awd mode when stuff goes wrong.
What if each tire has different grip depends on the road condition and want to transfer differant power to each wheels? Is center diff do the same effect? Also, I want to know the way vehicle detacts the road condition by itself. This movement should be all in automatic way like audi r8. This is no suv at all. I am talking about k series. In high speed 90% of the power goes to rear for a higher speed. In the corner, outside wheel gets more power than the other for a better turn. In the snow, if FL tire is in ice, that FL tire gets 40% of power and FR, RL, RR tire gets 20% each.
it's difficult. i believe the sunburst has lua code for an active differential, maybe take a look at that and try to adapt it?