it is not a drain nut it takes a 1/2 inch rachet to unscrew it from the bottom of the oil pan
The gas tank on the 2008 GMC Sierra-3500HD holds 34 gal..
The gas tank on the 2008 GMC Sierra-1500 holds 26.0 gal..
The gas tank on the 2008 GMC Sierra-2500HD holds 34 gal..
Sorry but no
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).