Slip Yoke Eliminator Kit for Jeep TJ, YJ, XJ, MJ Models w/ NP231 Transfer Case RT Off RoadEliminate drive line vibrations and increase the strength of your NP231 with RT Off Roads Slip Yoke Eliminator Kit. Each kit includes a replacement output housing, heavy duty main shaft, rear output yoke designed for a double cardan drive shaft, and all necessary hardware. The Installation can be performed with the transfer case in or out of the vehicle with basic hand tools. Engineered to function with the factory speedometer sensor cable and vacuum