How can you tell what gear ratio you have in a 1993 ford f150?

On the end of the drivers door on one of the information stickers you will see a 2 " character " axle code such as " 19 " ( which would be a 3.55 non - limited slip ) , " 18 " ( which would be a 3.08 non - limited slip ) " H9 " (3.55 limited slip ) " B6 " ( 3.73 limited slip ) The code is used to look up the type of differential and gear ratio