finding the gear ratio? - Ford Powerstroke Diesel Forum
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Old 06-10-2011, 06:34 AM
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finding the gear ratio?

been checking on the gear ratio of my 1997 350 and in abit confused. read most of the threads on it so i know to check the tags on the rear end there is none. the tag on the door is not rite , previous owner changed. went out and spun the tire, this is wear i get confused. tire turns one time around the drivline turns two and a quarter. the is ratio? oh I'm running 35's and am at 65 at 2000RPM.
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Old 06-10-2011, 07:17 AM
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that cant be right....2 1/4 turns at the driveline for one turn at the wheel would make it like a 2.32?? not sure man, good luck
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Old 06-10-2011, 10:02 AM
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checked it several times. 2 1/4 turns. maybe i can get a vidio this weekend. and i can find out what is wrong? i need help.

Last edited by chaosdanno; 06-10-2011 at 10:58 AM.
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Old 09-12-2011, 03:23 PM
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wouldnt the 35s change your rotation?
are you making the marks on the ground?
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Old 09-12-2011, 03:24 PM
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The 35s will obviously change the whole thing. Maybe try putting a stock size tire on and see what the difference is?
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Old 09-12-2011, 03:35 PM
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The 35's would only change the amount of ground covered by one revolution of the axle since the outer circumference is bigger. 35's not have an effect on how many revolutions the axle makes in relation to the driveshaft.

The ring gear should have the ratio stamped on it, if you pull the diff cover off.
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