M5R1 5-Speed 4WD Remanufactured Manual Transmission

The Zumbrota Drivetrain M5R1 manual transmission is a remanufactured unit built to exacting quality standards for Ford Ranger and Bronco II 4WD models from 1988-1992. This 5-speed transmission is specifically designed for the M5R1 gearbox and features a 4WD drive type and a 7-tooth speedometer gear. Each Zumbrota Drivetrain transmission is subjected to a comprehensive three-step remanufacturing and inspection process. This includes an initial pre-inspection to identify case cracks, excessive wear, or OEM-specific issues. A second inspection verifies that all component parts meet OEM specifications during the remanufacturing process. Finally, a post-build inspection ensures the unit is built to strict quality standards, with 100% inspection of internal parts, including gear wear, mainshaft straightness, and synchronizer testing. To guarantee performance and reliability, all transmissions are dynometer tested through numerous real-life scenarios to confirm operation, shiftability, and noise levels. This rigorous testing, combined with the replacement of all seals, sets a high standard for manual transmission remanufacturing, ensuring precision and reliability at all critical touchpoints. The remanufacturing process also includes an exclusive hydro-blast rinse and sandblasting procedure on internal and external parts, followed by a proprietary shot-enticed deep cleaning.