ATHS has Peterbilt sales order records available from converted microfilm factory records. Copies are available for trucks built as early as 1939 to approximately 1972. Records range from 5002 to 49448 for trucks; 5014 to 5894 and 28080-K to 39396-K for glider kits.

Peterbilt trucks built from June 1939 through August 1958 were identified by M-XXXX for two-axle trucks and L-XXXX for three-axle trucks. After August 1958 the five-digit sales order number was also used as the chassis identifier.

The truck ID# is located on the brass tag on the inside of the cab in front of the clutch pedal (Display 1), and stamped in the right-hand frame rail below the right rear corner of the cab (Display 2). Please check both areas to confirm matching numbers. The truck ID# on the brass tag or frame rail is required when placing an order and will be entered in the space provided.