James Gaskets’ Super Nut improves the sealing ability on Harley Big Twin 4 speed transmission shafts found on Knucklehead, Panhead and Shovelhead models.

The additional seal built into the nut helps avoid transmission oil leakage from main drive gear bushing wear.

Fitment

• 36-64 Harley knucklehead, Panhead Big Twin (Open or closed primary)
• 65-69 Harley Panhead Big Twin (Open primary only)
• 70-80 Harley Shovelhead Big Twin (Stock primary)