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DT12 General Description
P4 DM Ch17; CasGen5 DM Ch15
Detroit transmissions have twelve forward gears and up
to four reverse gears that can be shifted automatically 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
permit. In all cases, shifts depend on the following factors: engine
speed, accelerator pedal position, service brake usage, engine brake
operation, vehicle load status, and road conditions.
Note: To
avoid potential engine stall risk or unexpected shifting, use the
interaxle differential lock when the vehicle is operated in slippery
conditions. See General Description, Interaxle Lock and Tandem Axles for information about the interaxle
differential lock.