Vehicles are assigned the VIN number at the time the order is scheduled but specifications/options can be changed up until the order is "Locked In" which is about the time the scheduling is refined to the "Scheduled to Day" point or 2-3 weeks prior to production. There are restrictions and certain specifications cannot be changed... Body Code, Equipment Package/PEP #, Powertrain (?) and/or controlled commodities. The most common changes are to paint, interior trim and miscellaneous freestanding options. Any changes made to a scheduled order will push the scheduled production date back a minimum of 1 week. Changes made to an order are sent to the plant for processing with confirmation and a revised DORA sent 24 hours later if the changes are approved.
Edited May 18 by ice-capades