ZF 6S850 Gearbox – Heavy-Duty 6-Speed Manual Truck Transmission

The ZF 6S850 Gearbox is a robust 6-speed manual transmission developed by ZF Friedrichshafen AG for medium and heavy-duty commercial vehicles. Part of the renowned ZF Ecolite transmission range, the 6S850 is engineered to provide reliable power transfer, smooth gear engagement, and long service life in demanding transport operations. Designed for trucks with input torque ratings of up to approximately 850 Nm, the gearbox features fully synchronized forward gears, durable internal components, and optimized gear ratios that help improve fuel economy and driving performance. The transmission is widely used in regional freight, distribution, construction, and vocational truck applications. Built with heavy-duty bearings, forged shafts, and reinforced gearing, the ZF 6S850 offers dependable operation, easy maintenance, and reduced downtime, making it a popular choice for replacement and rebuild projects.