Sensors
for your 1991 GMC R3500
The sensors housed with the trans components-automatic work in conjunction with the relays to transmit information between the ECM and the transmission. The information can relate to shaft speed, oil pressure, gear position, and the revolutions of the engine. These components are GMC R3500 specific and vital to the operation of the transmission.
When components like sensors and relays malfunction, your GMC R3500 may receive mixed signals from the operating system. If the transmission is not able to consistently change gears, you can do long-term damage to several parts of the engine. If you wait too long, a transmission can be a costly repair. Find replacement parts at StockWiseAuto.com.