Allison® 1000 6-speed automatic transmission

With over a decade on the job, the legendary heavy-duty Allison® 6-speed transmission includes: 

  • Driver Shift Control (DSC), which allows the driver to manually select upshifts and downshifts with buttons on the column shifter
  • Tow/Haul mode, which reduces shift cycling for better control and improved cooling when towing or hauling heavy loads
  • Automatic Grade Braking, which uses the engine and transmission to slow the vehicle on downhill grades and help reduce brake wear (operates in Tow/Haul mode)

Requires the available Duramax 6.6L Turbo-Diesel V8 engine.