Start at the passenger-side dashboard plate. If that fails, go to the underside of the hood. If that is painted over, get on your back and scrub the driver’s side front frame rail. In 99% of cases, that frame stamp will be there—faint, rusty, but readable.
: An engine-specific number can be found on the driver's side of the "shelf" where the transmission bolts to the engine. humvee serial number location