TeraFlex JT: Alpine Short Arms provide complete alignment adjustability and dependability for maximum performance on JT Gladiator models with 0-4.5 Inch Lifts. Bolts to the factory control arm mounting brackets. High-quality, dependable, maintenance-free, factory-style bushings provide excellent NVH damping and ride quality.Can be added to any existing suspension lift.Includes: Alpine Short Arm Pairs: Arm Pair - Front Upper (# 1416520) Arm Pair - Front Lower (# 1416500) Arm Pair - Rear Upper (# 1417530) Arm Pair - Rear Lower (# 1417540) Fitment: JT Gladiator (pickup) Specs: Lift Height: 0-4.5 Inch Control Arm Specs: JL / JT: Alpine Short Arm Pair - Front Upper (# 1416520): Tube Diameter & Wall: 42mm x 4mm Factory Length: 20.185 Inch Min. Length: 20 Inch Max. Length: 21 Inch Bolt - Both: 12mm Bushing - Axle: OEM Bushing - Frame: # 611014 JL / JT: Alpine Short Arm Pair - Front Lower (# 1416500): Tube Diameter & Wall: 42mm x 4mm Factory Length: 24 Inch Min. Length: 24 Inch Max. Length: 25-1/4 Inch Bolt - Both: 16mm Bushing - Both: # 09-01-201-001 JT: Alpine Short Arm Kit - Rear Upper (# 1417530): Tube Diameter & Wall: 42mm x 4mm Factory Length: 16-3/8 Inch Min. Length: 16-1/8 Inch Max. Length: 17-3/8 Inch Bolt - Both: 16mm Bushing - Both: # 09-01-201-001 JT: Alpine Short Arm Kit - Rear Lower (# 1417540): Tube Diameter & Wall: 42mm x 4mm Factory Length: 23-3/4 Inch Min. Length: 23-1/2 Inch Max. Length: 24-3/4 Inch Bolt - Both: 16mm IR Bushing - Both: # 09-01-201-001