Transmission Shifting

Shift valve operation in 42RE transmissions with the electronic governor mechanism is basically unchanged. The 1-2 and 2-3 upshift sequence occurs exactly the same as in non-electronic governor transmission.

The valve body shift valves are still moved by a combination of throttle position and governor pressure. The only real difference is that governor pressure is generated by electrical components instead of a mechanical valve and weight assembly.

The conditions under which a shift to fourth will not occur also remain the same. These are:

- shift to third not yet completed
- overdrive switch is in the "OFF" position
- throttle is at 3/4 to wide open position
- vehicle speed is too low for 3-4 shift to occur
- transmission fluid temperature is below 1°C (30°F) or above 121°C (250°F)