Sometimes the sticker is not available on the rear axle, or it is impractical to ask a customer to look under their car. In these case the two letter code from the door plate can be used to find out the factory installed gear set. This will not help if the rear axle gear set has been changed.
BB – 3.73
DD – 3.55
GG – 3.31
YY – 3.15
CC – 2.73