Axle ratio can be found on a metal tag hanging on the diff cover (rear).
If you can't figure out the code on the tag yourself, just post it up.
Without that sticker (the Vehicle cert Label), you do not have anywhere to gather all the other info.
Your VIN can only tell you:
1,2,3rd = Designates Ford or Mercury, stripped chassis or Multi=purpose vehicle
4th position = Vehicle Brake Type and GVWR
5,6,7 position = Line, Series, and Body Type
8th position = Engine Code
9th position = Check digit
10th position = Model Year
11th position = Assembly Plant code
rest of them are an alphanumeric code for the vehicle build sequence, vehicle serial number and warranty number.