the true track is thebest of both worlds, the lack of preload means less clutch wear and tear around corners as the clutches can easily slip, however under power the specially cut helical gears massivly increase the amount of pressure the side gears are forced outward towards the clutches with, this is increased even more if one axle is spinning faster than the other as the gears try to "climb" away from the spider gears (TPA-tooth pressure angle, the profile of the helical teeth area is what helps this), and are forced even harder into the clutches.
his clutches might be a bit worn dep on how often he's flooring it around corners, but that is a true trac right there bud, not an open diff (which has straight cut tooth profiles)
if you wanna test it get two guys one on each side with the trans in park both turn the wheels in the same direction, one of ya try to spin the tire with a little more force than the other and have a third eyeball on the side gears, you will physically see the side gears forced outward as they release and apply turning pressure (also a good way to determin the condition of the clutches, they actually have a spec for it iirc)
so toss in a tube of lsd lube