Keeping you Ready for the Road Ahead , the Dorman Manual Transmission Output Shaft Speed Sensor monitors the speed of the output shaft of the transmission and transfers the data to the Transmission Control Module (TCM). This data collection ensures optimized engine performance, monitoring the operation of the transmission, and ensures smooth gear changes. If this sensor becomes compromised or fails, it could lead to issues such as rough shifting, poor fuel economy, or problems with the truck’s overall drivability. Dorman has a distinguished reputation in the heavy duty truck and trailer aftermarket, manufacturing a variety of parts for a complete repair. Through advanced engineering, Dorman successfully checks into today’s most common failures to figure out the why, ultimately delivering modern solutions that not only match OEM parts, but solve known issues. FleetPride is your First Click in Heavy Duty .