Drive Range - Fourth Gear (Gen 1): Notes

As vehicle speed increases, the transmission control module (TCM) processes input signals from the automatic transmission input and output speed sensors, the throttle position sensor and other vehicle sensors to determine the precise moment to command OFF the normally-high 35R pressure control solenoid 2. At the same time, the normally-low R1/456 pressure control solenoid 3 is commanded ON to regulate 4-5-6 clutch apply and the transmission shifts into Fourth gear.