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  1. M

    An Engineer's Ultimate Guide To 3.21 VS 3.92 Axle Ratio

    Using the data provided, it appears that at lower non-highway speeds where the 3.92 stays in gear 4,5,6,7 or 8 that it would be slightly more fuel efficient than a 3.21 in gear 3,4,5,6 or 7….
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