6-Speed Automatic
Transmission, 8-speed automatic, electronically controlled with overdrive and tow/haul mode, includes Cruise Grade Braking and Powertrain Grade Braking (Requires (LV1) 4.3L V6 SIDI engine or (LWN) 2.8L Duramax Turbo-Diesel engine.)
Transmission oil cooler, external (Not available with (LWN) 2.8L Duramax Turbo-Diesel engine.)
Brake/transmission shift interlock, for automatic transmissions