I had a truetrac in a 4200 lb dakota pick-up with a stroker 383 that was making 535 ft lbs of torque, shifted with a TKO transmission, and never had a problem with it. I prefer the truetrac over a locker because going around corners is very smooth, no ratcheting action like you get with a locker.

when you get into the throttle and "set" the truetrac, it locks up just like a locker does, but when there's very little throttle input, and/or nearly zero traction, it acts like an open diff, in fact, if you jack up the rear and spin a tire, the opposite side will spin backwards, just like the open diffs, it does this because there's no load on the gears inside the differential.

I also like the truetracs because they don't have clutches that wear out