Rotary top 4-speed transmission is assembled. Rotary top 4-speed transmission includes all internal parts assembled in a replica case, chrome kicker cover & components, mount studs & clutch hub nut. Unit will accept belt or chain final rear drive and features later mainshaft to accept 1984-1990 clutch hub & componenets. Fits FXB models by substitution of rotary shift linkage. No Manufacturer's Statement of Origin required, Bill of Sale only.