A vehicle suspension assembly that includes first and second main beams each having a first end operably coupled to a vehicle frame, and a second end having a cavity formed therein, and first and second extension members each having an aperture extending therethrough, wherein the first and second extensions are interference-fit within and extend outwardly from the cavity of the first and second main beams, respectively. The assembly further including a torsion member having apertured first and second ends that receive the first and second extension members therein, and threaded mechanical fasteners extending through the apertures of the first and second extension members and engage nuts that are frictionally engaged by the first and second main beams.