Collection: Transmission Parts for Harley-Davidson, Indian & Metric Custom Motorcycles

The engine's power alone is not worth much if it doesn't reach the rear wheel efficiently – and that's precisely the gearbox's job. The gearbox is the mechanical system that transmits the engine's torque through the appropriate gears, allowing for smooth starts, dynamic acceleration, and calm, low-RPM highway cruising. A well-maintained gearbox works almost imperceptibly – but as soon as a gear, bearing, or shifting component starts to wear, you'll immediately feel it: in the form of difficult or jerky shifting, unusual noises, or uneven power delivery. Our range includes gearbox parts for Harley-Davidson, Indian, and metric custom motorcycles, from classic 4- and 5-speed systems to modern 6-speed gearboxes. Available are gears, main shafts, bearings, shift forks, shift components, mounting plates, covers, and gaskets, as well as complete rebuild kits – from factory-spec replacement parts to heavy-duty, performance-enhanced solutions. Quality parts are manufactured with precision from high-strength materials to reliably withstand continuous shifting and high torque, even with intensive use. Whether you're replacing a worn part, undertaking a complete gearbox overhaul, or a restoration project, you'll find the gearbox parts that precisely fit your motorcycle's system.