FASTGEAR C6J50J Gearbox – Heavy-Duty 6-Speed Manual Truck Transmission

The FASTGEAR C6J50J Gearbox is a heavy-duty 6-speed manual transmission designed for light and medium-duty commercial trucks, delivery vehicles, and industrial applications. Manufactured by Fast Gear, the C6J-series transmissions are engineered to provide reliable power transfer, smooth gear engagement, and long service life under demanding operating conditions. The C6J50J belongs to FAST’s synchronized 6-speed transmission family and is designed for commercial vehicle applications requiring efficient torque delivery, fuel economy, and dependable durability. Similar C6J-series transmissions are rated for approximately 450–550 Nm input torque, feature fully synchronized gear engagement, and utilize an overdrive top gear for improved highway fuel efficiency. Built with reinforced gears, heavy-duty bearings, and a durable transmission housing, the FASTGEAR C6J50J gearbox is ideal for replacement, repair, and rebuild projects in commercial transport fleets.