These CAD-engineered TeraFlex JK: Alpine Long Arm Brackets are designed for maximum strength. By streamlining the frame-end mounting points, we were able to incorporate both upper and lower mounts in each bracket thus simplifying installation while maintaining a factory appearance. On higher lifts, Alpine Long Arm Brackets reposition the frame-end control arm mounting points to restore near factory orientation to reduce bushing stress during droop and shock load transferred through the control arms. Can be added to an existing suspension lift. MUST be used with adjustable Long Control Arms (Alpine IR: # 1315000 & Alpine: # 1315000) to optimize caster angle and tune anti-squat geometry for proper suspension alignment on JK Wrangler/Unlimited models with 3-6in lifts.