...Also every one knows that with an open (no posi or ltd slip) differential it is the right rear tire that goes up in smoke. There must be more traction on the left rear? Maybe that is also the result of the change in direction of rotation in the differential...
Rick
This one is simple. The engine torque is sent to the rear axle, requiring an equal and opposite torque reaction from the contact patches of the tires and the suspension attachment points to the axle. The result is an effective weight transfer from the right side of the axle to the left. All things being equal, the right side tire has less "weight" on it, so it develops less grip.
I am interested in ordering one of these torque arms. But, I have another question about it. Does the connection between the arm and the forward chassis mount allow for some longitudinal compliance? In my experience (admittedly with a coil-sprung axle, not leaf), a small amount of front-to-rear compliance is needed to prevent binding as the suspension articulates while accelerating.
An observation: It is pretty impressive that this torque arm will hold up to Duke's massive torque monster of an engine. The one I ran on my less powerful Mustang was far more substantial. Nice work, indeed.
Regards,
John.