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There should be an axle code on the Vehicle Certification Label inside the door. I'm not sure what is what from the information you posted. Post the axle code from this label and then check the FAQ.
Some idea of how its done...I dug this up from another post...
3S 409H
3L 73 10 5 1B16
3S is the Sterling Heights, Michigan Visteon (formerly Sterling) plant.
409H is the axle model and revision
3L 73 is a 3.73 ratio with Limited Slip
10 5 is 10.5" ring gear diameter
1B16 is the manufacturing date code for February 16th 2001.
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