Main Shaft and Related Parts

Accurate reproductions of the mainshafts for 3-speed transmissions of pre-war models.

While all other gears of the 3-speed transmissions in 1915-35 Big Twins are in good condition, the sliding gear (1st and 2nd main shaft) is mostly shot. The teeth of our sling gears feature chamfered edges for smoother shifting.

Accurate reproductions of the main drive gear bearing races for 3-speed transmissions.

Right side bearing for the mainshaft that replaces your worn period part. Harley-Davidson used an angular ball bearing for this heavy-duty-job, as those bearings offer a wider off-center tolerance than "standard" ball bearings. Two balls more per bearing than standard provide higher load capacities. The bearing will take axial loads only in one direction, so be sure to install it the right way.