The 2011 GMC Sierra-1500 has a 4-speed automatic.
The 2011 GMC Sierra-2500HD has a 6-speed automatic.
The 2011 GMC Sierra-3500HD has a 6-speed shiftable automatic.
The 2011 GMC Sierra-1500-Hybrid has a 4-speed shiftable automatic.
The 2011 GMC Sierra-3500HD has 16 valves.
The 2011 GMC Sierra-3500HD has a V8 engine.
The 2011 GMC Sierra-2500HD has 16 valves.
The 2011 GMC Sierra-2500HD has a V8 engine.
The 2011 GMC Sierra-1500 has 12 valves.
The 2011 GMC Sierra-1500 has a V6 engine.
The 2011 GMC Sierra-2500HD is a gas-powered vehicle.
The 2011 GMC Sierra-3500HD has overhead valves (OHV).