Allison 1000 Series Five-Speed Automatic Transmission

Allison 1000 Series Five-Speed Automatic Transmission Features:

  • The Allison five-speed automatic transmission available on 2500HD and 3500 models is a GM-segment exclusive.(1)
  • The Allison transmission uses many of the same load-carrying components found in Chevy medium-duty commercial truck transmissions.
  • Heavy-duty park pawl.
  • Grade braking — a feature that automatically downshifts to help slow the vehicle when the driver applies the brakes while descending long, steep grades.
  • Impressive gear range, including a low first gear to get the load moving.
  • Passive shift stabilization to help reduce shift "busyness" when driving on mountainous terrain.