Transmission Controls
Detroit™ Automated Transmissions
See Chapter 15 for complete Detroit automated transmission operating instructions.
Vehicles with Detroit transmissions use the multifunction control see Fig.. This control moves in two directions and has two switches. It is used to request manual shifts, change shift mode, set engine brake levels, and control specialty engine brake functions during cruise control operation.
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Front View
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Shift Requests
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Four positions for engine brake settings
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Engine Brake Symbol
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D/N/R Switch
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Mode Switch
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Gear Shift Symbol
Fig. 1, Detroit Multifunction Control
Eaton Automated Transmissions
Note: See Chapter 15 for complete automated transmission operating instructions.
The SmartShift electronic transmission control is installed with the Eaton® Fuller® UltraShift™ and Eaton Fuller AutoShift™ transmissions. The SmartShift control is operated by the fingers of the driver's right hand, allowing both hands to remain on the steering wheel.
A two-position driving mode slide switch is mounted on the body of the control lever just before the paddle widens out. The slide switch allows the driver to choose automatic (AUTO) or manual (MAN) mode. See Fig..
Note: To upshift manually, pull the lever back (towards the driver). To downshift manually, push the lever forward (away from the driver).
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SmartShift Control Lever
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Slide Switch (forward driving mode switch)
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MAN Mode (of slide switch)
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AUTO Mode (of slide switch)
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Upshift Direction
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Reverse Position (of selector switch)
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Selector Switch
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Neutral Lock Button
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Neutral Position (of selector switch)
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Drive Position (of selector switch)
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Low Position (of selector switch)
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Downshift Direction
Fig. 2, SmartShift Control (Eaton Fuller UltraShift and AutoShift transmissions)
Manual Transmissions
Note: See Chapter 14 for complete manual transmission operating instructions.
If so equipped, the transmission range control and splitter valves are attached to the gear shift knob.
The range-preselection lever allows the selection of the low or high range for each transmission ratio. It is used once during an upshift sequence and once during a downshift sequence.
Dependent on the transmission model, some ratios can be split using the splitter-control button.
Allison Automatic Transmissions
Automatic transmissions have up to six forward speeds and one reverse speed. These transmissions have electronic shift controls that can be programmed to allow the use of different geared speeds. See Fig..
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Indicator Panel
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Mode ID