Trying to keep it simple, there is always 100% power to the front wheels. When the rear axle is engaged the wet clutch pack in the rear differential can go from 0 - 100% engaged giving up to 50 /50 power distribution. It's pretty much imposible to send more power to the rear than the front like sport mode implies. Unless there is a center diff. Which we don't have.
The video that clew mentioned shows 40/60 F/R split in Sport and "up to 100% of torque available to the rear" in Mud/Sand mode. What do you make of that? Not possible?
I thought I read a post from someone on this site that stated a 50/50 split in one of the modes (but of course I can't recall which mode -- that's why I'm trying to find it).
2014 Trail Hawk
V6 | Anvil | Black leather | Tow | Comfort | Cold | Tech | Nav | Subwoofer | Soul patch | 20% tint | 245/70R17 Duratrac