Stock Jeeps have a slip yoke style output shaft at the rear driveline. This design is not conducive to off road use nor the steeper operating angles caused by suspension lifts. To ensure smooth and durable driveline operation, convert to a fixed yoke output and install a CV drive shaft (style RE1898). A must on all lifts over 3.5 inch. This kit requires the modification of your stock output shaft. Drill and tap included for easy installation. Drive flange is machined from solid Stainless Steel for extreme strength and corrosion resistance.