The FAST 12JSD200TA-B 12-Speed Manual Transmission Assembly is a heavy-duty mechanical transmission designed for commercial vehicles that require a wide range of gear ratios and high-torque capability. As part of the vehicle drivetrain system, the gearbox transfers engine power to the drive axle while allowing the driver to select appropriate gear ratios according to vehicle load, road conditions, and operating speed. The 12JSD200TA-B features 12 forward gears and 2 reverse gears, with a published input torque rating of 2,000 N·m and a maximum input speed of 2,600 rpm. Its gear ratios range from 12.098 in first gear to 0.779 in twelfth gear, providing low-speed torque multiplication for heavy-load starting and climbing while offering higher-speed ratios for highway transportation. The transmission uses a mechanical shift structure and a double-intermediate-shaft arrangement, with synchronizer configurations available in the 12JSD200TA-B transmission family. Its published installation length is 983.4 mm, while the listed assembly weight varies by housing material, with reference figures of 397 kg for an iron configuration and 288 kg for an aluminum-alloy configuration. The transmission is suitable for heavy-duty truck applications involving long-distance freight, construction transportation, mining logistics, and other operating environments where the drivetrain is subjected to substantial and continuous loads. Before purchasing, buyers should confirm the complete transmission model, engine torque, clutch and bell housing configuration, PTO requirements, installation length, output arrangement, and vehicle chassis specification to ensure the 12JSD200TA-B is correctly matched to the intended truck.