4-speed automatic transmission

Engineered to provide smooth seamless shifts, the Hydra-Matic electronically controlled 4-speed automatic transmission with overdrive is matched with the Vortec 4.3L V6 and 4.8L V8 for added control and confidence. It includes Tow/Haul mode, which adjusts the transmission shift pattern to reduce shift cycling, providing increased performance, vehicle control and transmission cooling while trailering.

On Crew Cab models, requires Vortec 4.8L V8 SFI FlexFuel engine.