Transmission
If so equipped, the transmission range control valve and splitter valve are attached to the gearshift knob. Transmission shift pattern labels are located inside the cab. See Driving Precautions for complete transmission operating instructions.
T-Handle Shift Selector
Vehicles equipped with a standard Allison On-Highway Series automatic transmission, have a T-handle shift selector. See Fig..
When the transmission is in D (drive), the vehicle will operate in 4th and 5th gear as needed. To shift down into a lower gear, pull the lower half of the T-handle selector up. Select the gear needed and release the lower half of the T-handle selector.
Fig. 1, T-Handle Shift Selector
On vehicles with an Allison MD Series automatic transmission or an Eaton Autoshift automated transmission, a push-button shift selector, shown in Fig., provides four, five, or six forward ranges and one reverse range. See Driving Precautions for more information about the push-button shift selector.
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Digital Display
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Mode Identification Label
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Mode Indicator LED
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Mode Button
Fig. 2, Push-Button Shift Selector
Transmission Mode Switch
Some vehicles are equipped with a transmission mode switch, shown in Fig.. The transmission mode switch is a fuel conservation option that allows the driver to choose either performance or economy shifting. When the switch is in the on position (the top of the rocker switch is pushed down), the transmission shift pattern changes from primary (performance) shift mode to secondary (economy) shift mode. When the transmission mode switch is in the off position (the bottom of the rocker switch is pushed down), the transmission reverts back to the primary shift mode.
Note: Primary and secondary shift mode calibration varies by vehicle.
