HM290 5-Speed Manual Transmission

The Zumbrota Drivetrain HM290 is a remanufactured 5-speed manual transmission, specifically engineered for 1988-1992 GM 1500, 2500, and Van models with 2WD drivetrains. This unit boasts an integral bell housing and a 3-rail internal shift mechanism, complemented by an external slave cylinder for efficient operation. It includes a 7/8-inch speedometer hole and is identified by Hollander Number 400-02254A. The remanufacturing process at Zumbrota Drivetrain involves a rigorous three-step inspection, including pre-inspection for common core issues like case cracks and excessive wear, measurement of component parts to meet OEM specifications, and a final post-build inspection. Internal parts undergo 100% inspection for wear, shaft straightness, and synchronizer function. Unrivaled standards are set for precision and reliability through proprietary cleaning procedures like hydro-blast rinsing and sandblasting, followed by a deep cleaning process. To ensure peak performance and quality, every transmission is dyno-tested for operation, shiftability, and noise levels, simulating real-life scenarios. The transmission also comes with a 2-year limited warranty for added peace of mind.