Quote Originally Posted by Dino
I bought brake pads to go all around and while I'm down there, I'll start troubleshooting my ABS. Still no worky, which explains wheel spin when I'm in 4 low with a wheel off the ground. As I understand it, that wheel should lock thus transfering torque to the other wheel on said axle. NOT!!

The TOD kicks in nicely on gravel roads. On pavement while driving I see one light on per side to the front axle. I'm sure the fluid is low, it has the symptoms but I've got that covered too.
ABS has nothing to do with wheel spin...only braking.
In 4Lo TOD is not in play. The transfer case simply splits the power 50/50 between front and rear axle. Your rear differential is a LSD. If one wheel loses traction the clutches heat up and engage the other wheel. The front differential is open. Only one wheel will spin...unless you (or the previous owner) have installed a locker. Only two lockers are available for the front Isuzu 10 bolt...the Aussie auto locker and the ARB selectable air locker.
Hope this helps your trouble shooting!