This System is stronger than O.E. type applications recommended for stock to 4�" lift & up to 35� tires for mild use. *2 door with 4�" lift are recommended to use 1350 rear driveline. J.E. Reel Drivelines are designed to work with 2�� & 4�� lifts from most lift manufacturers. Lifts higher than 4�" or long arm lifts must be measured for driveline length. It is best to measure all drivelines if possible. Note: JL 2018 Powertrain is installed at 9.25�. This means the Transfer Case rear output slopes down to rear axle and front output slopes up away from front axle. This is especially important to consider on the 2018 model JL. Maximum Angle 1310 C.V. Less than 26� and 1350 C.V. Less than 32�.