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I would think it would be a 3.91 .But you should find a small metal tag on one of the cover bolts. I can't remember the constent number or you could find it using your tach,tire hight and mph
Theres 3 options for that rear. Look eithe ron a metal tag held on by one of the cover bolts, or there should be a paper tag around one end of the axle tube.