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4:88 ratio
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  1. 7.3L Power Stroke Technical Info
    '01 F-550 2wd with 7.3 and auto. stock dana 135 has gear ratio of 4:88. seems that pinion ring and gears are only able to change to 5:3*. would like a 4:10 or better. question is: what other axles or vehicles can I swap axles with for a better fuel milage vehicle. Love the truck, only 150k on...
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