[opnwhlmnd]

With uneven rear torsion bar lengths on a standard arm car, which has the longer arm on the left rear, the rear axle skews to the left as in it pulls the left rear toward rear and pushes right rear towards the front. With heights and rolling the birdcage you are just changing the skew and how fast and far the rear axle moves .

When reverse arm cars were popular they actually pushed the left rear forward and pulled the right rear toward the rear because the longer torsion arm was on the right rear. That's why they were so tight on entry. Shock technology back when they were popular was nothing like it is today.

There were also stacked/slant tube cars that had equal length/height torsion arms that the rear didn't skew the rear end either way.