I can't rember the exact working of a torsion diff, but here goes nothing. The torsion diff uses a serious of interlocking (meshing if you will) gears to lock the axles. These gears are very thin and are designed for a smooth engagement, that is why they are so good for the street and road course. These gears are very temperamental under a dead dig situation and will not perform very good at the track after a little because the gears are not designed for the sudden shock. A torsion diff is good if you rarely hit the track, but if you plan on running the stang much you will be replacing the torsion diff very soon. I wanted one untill i researched them myself and found that they break under sudden heavy loads, and at ~$400 a pop i am going with a C-locker. These are not really designed for the road though. If i were you i would look into the clutch diffs. They work well and are rebuildable. Light Em Up
