Allison® 1000 6-speed automatic transmission

  • Electronically controlled with overdrive for smooth-shifting performance
  • Tow/Haul mode that reduces shift cycling for better control and improved cooling when towing or hauling heavy loads
  • Auto Grade Braking that automatically downshifts when needed to enable engine braking to help slow the vehicle on downhill grades and help reduce brake wear (operates in Tow/Haul mode)
  • Requires the Duramax® 6.6L Turbo-Diesel V8 engine