What is a “rotation number?
VIN’s are assigned well before that car actually starts getting built, therefore it may not be in the actual order that that car goes down the assembly line. A “rotation number” is assigned to the car when it starts down the assembly line. This is a 4 digit number for the Thunderbird. The first series went from 0001 up to 9960 and then started over again. by knowing your VIN # and rotation # you can figure out the actual build or sequence number for your car. For example: my car’s VIN # is 119005 with a rotation number of 8588. Because of it’s high VIN #, I need to add 9960 to 8588 to get my sequence # of 18548.
