You need to install the new front output shaft seal into the transfer case, install the yoke flange to the front output shaft, and lubricate the new yoke flange O-ring seal with transfer case fluid. Then you need to install the yoke flange O-ring seal and install a new yoke flange nut. After that, you need to attach the J 8614-01 to the yoke flange and stake the yoke flange nut in 2 places. Finally, you need to install the front propeller shaft and fill the transfer case fluid.