The air intake tmeperature (AIT) sensor location is in the MAF sensor that is attached to your Stock airbox and intake. It is the the small amber teardrop you see when you remove the MAF sensor.
The 2008 GMC Sierra-2500HD has a V8 engine.
The 2008 GMC Sierra-2500HD has 16 valves.
The 2008 GMC Sierra-3500HD has 16 valves.
The 2008 GMC Sierra-3500HD has a V8 engine.
The 2008 GMC Sierra-1500 has a V6 engine.
The 2008 GMC Sierra-1500 has 12 valves.
The 2008 GMC Sierra-3500HD has overhead valves (OHV).
The 2008 GMC Sierra-2500HD has overhead valves (OHV).
The 2008 GMC Sierra-2500HD has a 6-speed automatic.
The 2008 GMC Sierra-2500HD is a gas-powered vehicle.
The 2008 GMC Sierra-3500HD is a gas-powered vehicle.
The 2008 GMC Sierra-1500 is a gas-powered vehicle.