[Ron Sutton]

If this is the broken Torque Arm situation that I'm aware of ... there is more involved. The one I'm aware of had rear wheel hop issues going into the corners. Torque arms don't cause that. Just the opposite, as "most" torque arms place the pick up point out 50"+/- ... which will lower the anti-squat % & help reduce wheel hop.

Wheel hop is typically caused by one of these things:
A. Too soft of rear springs ... insufficient force to hold the rear wheels down.

B. Too soft of shock valving ... insufficient control to hold the rear wheels down.

C. Too stiff of rear springs ... combined with too soft of shock valving ... running over bumps or irregular surfaces.
* Stiff spring impacting bumps causes the hop ... and the shock with too soft of valving can't stop it.

D. Too much anti-squat (too short of an Instant Center) ... causing the car to be loose under braking. Rear wheel hop is the stage just before "loose entry".
* Too much rear brake bias can compound the problem, but doesn't cause wheel hop by itself.

E. Driver down shifting too early and/or letting the clutch out too early (before engine RPM's match the speed of car).

None of those are caused by running a Torque Arm suspension ... but continuous rear wheel hop ... can break almost any rear suspension. So in this case ... if it is the one I'm aware of ... the wheel hop most likely broke the Torque Arm. As most likely, as the Torque Arm was breaking, the hop got worse.