If the vehicle has an Allison® five-speed or six-speed automatic transmission, you will also find an Allison® Transmission Operator's Manual in the vehicle which goes into more detail. On the headliner, in front of and above the driver, or in some other place near the driver, you will see a label that describes important operating facts about the automatic transmission in the vehicle. Make sure you follow the instructions on this label.
Vehicles equipped with an Allison® 3000 Series transmission come with a push button shift selector that will display transmission information. Refer to the Allison® Transmissions Operator's Manual for more information on transmission diagnostics and shift selector operation.
Be sure to keep the parking brake set until you are ready to shift into D (Drive). See Parking Brake for parking brake procedure. Press the brake pedal while shifting from N (Neutral) or P (Park) to a drive gear.
All vehicles with automatic transmission can be started in P (Park), if equipped, or in N (Neutral). See the Allison® Transmission Operator's Manual for additional information.
Caution: It can be dangerous to get out of the vehicle without the parking brake firmly set. The vehicle can roll. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure the vehicle will not move, even when you are on fairly level ground, always set the parking brake.
Caution: Shifting into a drive gear while the engine is running at high speed is dangerous. Unless your foot is firmly on the brake pedal, the vehicle could move very rapidly. You could lose control and hit people or objects. Do not shift into a drive gear while the engine is running at high speed.
Overdrive Defeat
If your vehicle has this feature, you can select not to shift up to fifth gear. This is useful when towing or under a heavy load.
The overdrive defeat switch is located in the instrument panel to the right of the steering column.
Press the switch to limit the transmission to fourth gear. This will allow for fewer downshifts while pulling a trailer or under a heavy load. The indicator light in the switch comes on whenever overdrive defeat is active.
If the vehicle is equipped with a push button shift selector, refer to the Allison® Transmission Operator's Manual for shift selector operating instructions.
