Manufactured by Teraflex. The TeraFlex TJ/LJ Dana 44/Dana 60 Rear Axle Upper Flexarm Mount is constructed from heavy-duty, CNC laser cut and precision bent 3/16�-thick steel and is accurately formed to ensure proper positioning for correct suspension geometry. Raw steel is ready for welding and paint or powder coating. FITS: � TJ/LJ Dana 44 or Dana 60 rear axle w/ 3.25� O.D. tube. � Driver side only. NOTE: � Welding is required.