How to Decode Buick Grand National VIN Numbers

VIN numbers can tell you a lot about your vehicle. The Buick Grand National was only produced for five years, but left a mark on many people. If you choose to restore your Grand National, you may need to use the VIN numbers to learn information you need to return it to original condition.

• You can locate the 17-digit VIN number on a plate located on your dash. You can see this number best by looking from the outside through your windshield on the driver’s side. Write down the VIN number on a piece of paper.
• The first digit indicates the manufacturing country. Buick made all Grand Nationals in the United States so this number will be a one.
• The second digit stands for the Manufacturer. Since GM manufactured the Grand National, this digit will be G.
• The third digit stands for the division of the manufacturer. GM has six divisions: Chevrolet, Pontiac; Oldsmobile; Buick: GMC and Cadillac. GM sells the Grand National under the Buick nameplate, so here you will find the number 4.
• The fifth digit notes the series, or body style. The letter G here stands for the G body.
• The sixth digit notes the option level of the vehicle. The VIN does not distinguish between the Regal T-Type and the Grand National. The letter K here shows that its one of the two.
  
• The seventh digit stands for the body code. The Grand National is a 2-door coupe, so here you will find a four. The body code’s second digit fills in the eighth digit.
• The ninth digit tells you your engine code. This will vary depending on which engine you chose.
• An X fills the tenth digit as a check digit. The 11^th digit notes the model year. The twelfth shows which plant your Grand National was manufactured at. Finally, you will find your six-digit serial number, which shows your car’s place in the production line for that year.