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The USA Made "Energy Suspension" torque arm inserts are a very strong replacement INSERT for the factory torque arm.
Once the old rubber is removed.. it clamps into the bracket shell and holds the metal arm that comes up from the diff with rigidity.. stronger then traditional rubber..and a bucket load cheaper then standard rubber.
The Torque arms basically are there to reduce wheel hop in acceleration, reduce shudder under braking & add greater handling control.
Its not uncommon for these to wear out.. but they add to clunking & stress on the gearbox mount if its crook. These are also preffered when ussing higher performance tires & horsepower upgrades. Works to upgrade your traction bar by firming things up.
These are so good they are Patented.