All,
How can I tell if the 2011 truck I'm looking at has the 800 Ft/lbs of torque engine? My research says that the year had two engines, early in the year (650 ft/lbs), and second half of the year (800ft/lbs). It's a 2500 MegaCab, Laramine. VIN 3D7UT2HL6BG518623
Thank you!

 

It'll have a little badge on the tailgate that says "Cummins High Output" unless the truck has been debadged.

 

...and of course the High Output only applies to those with the auto trans.