The transfer case coupler, or spool as it is commonly referred by is an important part of your driveline inside your 3/S transfer case. It is the part the output shaft from the transmission slides into and transfers power to the bevel gear inside the t-case, which transfers power to your pinion gear and then your driveshaft. If you rebuild your transmission and install a new output shaft it is important to also do your spool if it shows any wear.
We have a video of pressing a spool in and out on our Youtube channel here:
We offer both stock replacement style spools, hardened, or 300M spools for maximum strength.
*300M 6 Speed Spool Pictured