Products - Marine Transmission and Powertrain Clutch Assemblies Capitol Gear offered 4 standard sizes of clutch assemblies. Friction Disc's for Marine Gears We offer a broad range of friction products from quality manufacturers. Manuals & Part Lists Download the installation & maintenance, service & repair and parts information manuals. Parts and Service We have a complete offering of spare parts and assemblies for your Capitol Marine gear. Product Design and Development Product Design and Development. Transmission Models 12 Drop Center type reduction models and 4 In-Line Direct Drive (1:1 ratio) models.