There is no code on my door sticker for the axle ratio. Is there another way I can verify what I have. I want to make sure before I change the rear diff fluid. Any assistance would be appreciated. It is a 2001 4x2 4.6l Supercrew XLT.

 

Besides the door sticker, there's a metal tag under one of the differential cover bolts. It contains 2 rows of information. The lower row contains the gear ratio at the beginning (or on the left). Sometimes it's cruddy and the first numeral is hard to read, but easy to assume.