All Balls Racing 9 Tooth Jackshaft Assembly For Harley Big Twin One-piece design jackshaft assembly delivers more torque to the primary and is more tolerant of misalignment problems, all for less money than stock jackshaft assemblies. Features: Replaces the existing shaft, couplings and pinion gear Includes jackshaft, one 10-32 starter shaft bolt, spring, washer and snap ring Note: Also fits '94-'99 Evolution Big Twin w/ 66-tooth conversion gear installed on clutch basket.