35043-41 45CI Transmission Mainshaft

The mainshaft is the backbone of any gearbox, and for the 45" Flathead and Servi-Car models, finding a quality replacement is essential. This transmission mainshaft from Samwel Supplies is built to fit 1932 through 1974 transmissions, cross-referencing to OEM 35043-41. It is manufactured with the correct metallurgy and heat treatment to withstand the stresses of daily riding. If your original shaft is worn, pitted, or damaged at the splines or bearing surfaces, this replacement will restore the integrity of your drivetrain. It is a precision-engineered part that ensures your vintage Harley-Davidson continues to shift reliably, maintaining the mechanical standards required for these historic 45 cubic inch engines.