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The data plate is on the dashboard. If you are sitting in the driver's seat, it is located in front of your left knee...angling down toward the floor. It is easiest to inspect when you are on the ground looking up into the cab. Check out our favorite auction site for pictures. Just scroll...

There was a flaw with the originally designed drive shafts. So, Stewart and Stevenson, the original manufacturer, sent service techs out to the field to replace the drive shafts with a better designed unit. The data plates of all vehicles that were so upgraded should be stamped with a D.