Gear Display
The current transmission gear and driving mode are
displayed in the static menu at the bottom of the
driver display screen. See
Fig. 17.3.
Selected Gear (Detroit and Eaton
Transmissions)
If the selected gear is different than the current gear
for longer than a half second, the current gear dis-
play will flash and the selected gear value will be
shown. Once the current gear and selected gear
match, the selected gear display disappears and the
current gear display stops flashing.
Suggested Shift (Detroit and Eaton
Transmissions)
In Manual mode only (if available), a suggested shift
is displayed to indicate the most economical gear
available. The suggested shift is the number of up or
down arrows from the current gear with a maximum
of three up or down arrows.
Detroit
™
Automated
Transmissions (DT12)
Detroit transmissions have twelve forward gears and
up to four reverse gears that can be shifted automati-
cally or manually. Shifting and clutch actuation are
computer controlled, and there is no clutch pedal
needed to operate the vehicle. Automatic shifts are
selected for fuel economy or engine power. Manual
shifts can be requested with the shift control and the
transmission ECU grants them when conditions per-
mit. In all cases, shifts depend on the following fac-
tors: engine speed, accelerator pedal position, ser-
vice brake usage, engine brake operation, vehicle
load status, and road conditions.
NOTE: To avoid potential engine stall risk or un-
expected shifting, use the interaxle differential
lock when the vehicle is operated in slippery
conditions. See
Chapter 19 for information
about the interaxle differential lock.
Driving Modes
There are three driving modes: Manual, Automatic
Economy, and Automatic Performance. To activate
the manual drive mode, press and hold the mode
switch briefly. Press the switch quickly to activate the
automatic drive mode or change between modes.
See
Fig. 17.1.
In Automatic Economy mode, gear shifts are de-
signed for saving fuel. In Automatic Performance
mode, gear shifts are designed for higher perfor-
mance and are made at higher engine speeds. In
manual mode, gear shifts are requested manually.
NOTE: In Automatic Performance mode, the
transmission will automatically change to Auto-
matic Economy mode if it hasn’t received a re-
quest for more power in several minutes, unless
current road conditions require higher engine
performance.
f270164a02/17/2017
0
1
2
3
0. Off
1. Low
2. Medium
3. High
Fig. 17.2, Engine Brake Positions
f611348
06/13/2016
12
3
1. Suggested Shift
2. Current Gear
3. Driving Mode
Fig. 17.3, Typical Gear Display (Detroit and Eaton)
Automated and Automatic Transmissions
17.3
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