JL / JT Alpine IR Short Control Arms: • Adjustable Alpine IR Short Control Arms balance front caster angle and pinion angles as well as optimize rear pinion angle and tune anti-squat geometry for proper suspension alignment on 2-4″ lift kits • Alpine IR Short Control Arms are constructed from durable 42mm x 4mm wall DOM tube for maximum strength • Bolts to the factory control arm mounting brackets • Install and drive simple bolt-on installation – no welding required JL / JT Alpine IR Control Arms (all): • Re-centers axles in the wheel well for proper suspension movement. Can also be used to increase wheelbase • Full range of movement will not restrict articulation or flex off-road • Innovative IR Bushings provide unrestricted rotation and flex as well as excellent NVH damping • Maintenance-free IR Bushings improve on- and off-road ride quality and performance • Zero maintenance forged threaded joints for smooth quiet flex • Premium black e-dipped coating on tube and forged rod end housing provides superior durability and corrosion resistance • Anodized 6061-T6 aluminum clamp collar to secure rod end after length adjustment • TeraFlex Lifetime Warranty against defects