Yes on the locker and no on the Trutrac. TruTrac is Torque Biasing diff and directs the torque proportionally to the tire with the greater traction. It also drives the inner and outer wheels at different speeds in turns. The Torque Biasing diff's claim to fame is that they are totally smooth, do not bind, vibrate, or chatter at all on tight turns in high or low traction situations. Very nice design originally invented for F-1 cars in the 1960's
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Torque Biasing Diffs
Ed