Harley Davidson Transmission Seal Super Nut 36-86 4-speed Big Twin 36-86 BC18163

MCS, transmission seal nut (super nut style)
Import. The Super Nut has a strong reputation stretching several decades. The added benefit? This mainshaft nut, with built-in replaceable seal, will help you keep the transmission oil where it belongs... Inside. Note: Due to the added height it may interfere with some mainshaft support or inner primary cases. 

Fits: > 36-86 4-speed Big Twin (NU)