So what does this peace do below just the rod end? Is this made to allow correct movement of the rear end and rear suspension travel Vs a fixed rod end? Can someone explain why some crossmember mounted torque arms are like this?


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The torque arm needs forward and backward movement also. Look at the factory mounted torque arm. It's designed to slide in the bushing. That's also why you have a slip yoke in the transmission.

There's an early design that had a fixed mount but had a slip tube design. This had a protective dust boot and needed to be greased.