Going back to the Eaton Truetrac diff...
It's not for us. This is from their instruction manual "Note: TrueTrac differentials require a certain amount of resistance at the ground in order to start the power transfer. A TrueTrac differential may not transfer power if the spinning wheel is off the
ground. If spinning occurs, often a light application of the brakes, while carefully applying power, will slow the spinning wheel enough to allow the TrueTrac differential to transfer torque to the other wheel."
Although it's open until one wheel spins, if that wheel lifts or spins too much, it goes open again.
Torsen diffs are a better option, but the amount of work needed to tune the helical angles of the gears to get the performance we need is probably a cost beyond the reach of most manufacturers. Love it or hate it, a friction or fluid clutch is probably the best-cost option to see if an LSD is a performance enhancer or not compared to the beloved ball diff.
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