General Information, Allison Transmissions

Refer to the Allison website for additional information:www.allisontransmission.com.

Allison transmissions have electronic shift controls that can be programmed to allow the use of different numbers of geared speeds. For instance, the transmission can be programmed to operate as a 4-speed, 5-speed, or 6-speed unit in the "primary" shift mode. If needed, a "secondary" shift mode can be programmed to provide another shift configuration to optimize vehicle use under different operating conditions. To activate a secondary shift mode, or other special functions programmed into the electronic control unit (ECU), briefly depress the mode switch on the multi-function stalk switch control; see Fig.Allison Gear Display in Automatic Mode, item 3.

These transmissions use the multi-function stalk switch to select mode, direction, neutral, low, and to preselect lower ranges. The current gear, highest available gear, and mode are shown in the driver display; see Fig. Automated/Automatic Transmission Shift Control. Forward shifts can be made either automatically or by using Manual mode.