Transmission Controls

Manual Transmissions

if equipped, the transmission range control and splitter valves are attached to the gear shift knob.

To operate a range-shift transmission, move the shift knob through all the low-range gear positions and then pull the range-preselection lever up to move into the high-range ratios. Use the same shift knob positions in both the low and high ranges.

Dependent on the transmission model, some ratios can be split using the splitter-control button (located on the side of the shift knob).

Eaton Automated Transmissions

Eaton Fuller automated transmissions use a shift selection module. See Fig.. Shifts can be made automatically, or manually using the shift selection module.

The current gear is displayed on the gear indicator. At the start of a shift, the current gear continues to display until the transmission has been pulled into neutral. As the transmission is synchronizing for the new (target) gear, the gear indicator flashes the number of the target gear. When the shift is complete, the gear indicator displays the new gear, without flashing.

Allison Automatic Transmissions

HD-series automatic transmissions have six forward speeds and one reverse speed. These transmissions have electronic shift controls that can be programmed to allow the use of different numbers of geared speeds. See Fig..