6-speed automatic, heavy-duty transmission

The 6-speed heavy-duty automatic transmission includes:
• Driver Shift Control (DSC) lets you select a range of gears to suit variable driving conditions simply by moving the shift lever to "M" and using the convenient tap-up/-down button
• Tow/Haul mode raises upshift points to use more of the engine's power for acceleration and raises downshift points to use engine braking to slow your  vehicle for less noise and harshness
• Grade Braking (automatically activated in Tow/Haul mode but disengaged when DSC is activated) senses when you want to slow your vehicle, and if the appropriate conditions are met, implements a Grade Braking shift schedule to help you maintain your desired speed

Requires 3/4-ton models.