Our understanding, dealing with a Mustang 4 link suspension, was that one could make ineffective the upper links working with the free bushing rule, and add a working repositioned upper traction bar under the rule governing traction control devices.

Many running this chassis attemped to do this. For some unknown reason, we had a virtually ideal bushing/ride height/spring package, and never needed to go this route. We had workable, acceptable handling without the vices that others attributed to this chassis.

Hope this helps.

Good racing.

Bill