An open differential will apply 50/50 torque. If one side has a greater rotational mass then indeed the tyre will see less of the torque.
Unfortunately for such an argument, the radius of the driveshaft is about 0.5cm so the moment of inertia would be microscopic relative to the wheel and tyre. Then consider that we are only interested in the DIFFERENCE between the moments of inertia of the two driveshafts. I doubt such a difference would consume even a millionth of the mechanical energy.
The OP already indicates a left/right suspension imbalance. Old bushings don't like to be mucked with. The rubber developes a memory and likes to keep deforming the same way so it's critical to keep them happy, otherwise they will deform or tear and further throw out your L/R balance which is where torque steer thrives.
The mechanism for torque steer is identical to that of steering pull under braking. Scrub radius or longitidinal force - if they're not equal left/right, it's going to pull.
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Originally Posted by newpaddy3
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