[ChaseDale3and8]

A couple of other things that would help narrow down the actual year would be the axles and transfer case. If it has a 10 bolt rear, 10 bolt corporate front, and an aluminum 208 transfer case, it's likely to be an 81 and up. 12 bolt rear, Dana 44 front, and either a 205 or 203 cast iron transfer case would indicate 77 or earlier. It could possibly be an earlier truck that has had a cab swap done. The drivetrain would give you a better idea of the actual year. ...Joe