Tuner Setting - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 6 (permalink) Old 09-16-2009, 11:57 PM Thread Starter
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Tuner Setting

I have a 2004 Ford F250 4x2 and was wondering what axle ratio I should put in my tuner? I am guessing it is 3.73, but don't want to mess up the Tranny.
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post #2 of 6 (permalink) Old 09-17-2009, 12:15 AM
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Jack up rear and mark tire with chalk at 12 oclock position, mark driveshaft, now spin tire one full rotation while counting driveshaft mark. If it goes over 4 by a little it's probly 4.10 if it stops before the 4th rotation it's probly 3.73.
Or call dealer and have vin # ran.

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post #3 of 6 (permalink) Old 09-17-2009, 12:45 AM
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There shold be a tag on the rear end housing that states the gear ratio. It should be attached by one of the cover bolts.


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post #4 of 6 (permalink) Old 09-17-2009, 04:54 AM
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Being an F250, it is likely a 3.73 but you can do as has been suggested and know for sure......

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post #5 of 6 (permalink) Old 09-17-2009, 10:25 AM
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you can also find it on the build sheet/window sticker from when you bought the truck.

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post #6 of 6 (permalink) Old 09-17-2009, 12:28 PM
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look at the vehicle certification label insid the door. this will help decode it


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