87-06 Wrangler TJ/YJ;87-01 Cherokee XJ;87-92 Comanche;93-98 Grand Cherokee ZJ;NP231 transfer case;Heavy-duty output shaft;18% larger spline diameter;54% increase in torque capacity; California Residents: WARNING *Some models may require mode fork shift rail to be shortened. Add the Slip Yoke Eliminator to the Wranglers NP231 transfer case and solve a couple of problems such as changing a damaged drive shaft on the trail without losing all the lubricant, or eliminating the noise, vibration and wear that develops when the NP231 is lifted. Another benefit is the beefier rear output shaft that provides a 54% increase in torque capacity. Other kit components include: specifically designed aluminum rear output housing, bearings, seals, snap rings, bolts and instructions. **CV rear drive shaft is required.