37" tires with 3:31 gears - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 08-25-2012, 08:54 AM Thread Starter
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37" tires with 3:31 gears

Would like to hear from anyone running this setup. Like the look of the 37" but figured 35" is what I would put on due to the gears however with the power this thing has I am thinking about 37's again. Will 37's be too much for 3:31 gears?

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post #2 of 12 Old 08-25-2012, 09:39 AM
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Iam running 38x13.50r24 Havent noticed much loss in anything and the ride is awsome and looks good
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post #3 of 12 Old 08-25-2012, 02:05 PM Thread Starter
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3:31 gears and 38's?

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post #4 of 12 Old 08-25-2012, 02:26 PM
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Was running 37's with 3.73 gears on my last truck without much of an issue. Towing was questionable on a steep grade.

Are you sure you have 3.31 ?

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post #5 of 12 Old 08-25-2012, 02:39 PM
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With the lower gear in the 6R140, 3.31s put down more low end than 3.73s and the older 5R110 trans. So as far as the question of it being too much for 3.31s (at least with that transmission) I don't see an issue. Just realize there is curtain compromises on the highway while in overdrive.
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post #6 of 12 Old 08-25-2012, 04:38 PM Thread Starter
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Quote:
Originally Posted by STROKED_NY_023 View Post
Was running 37's with 3.73 gears on my last truck without much of an issue. Towing was questionable on a steep grade.

Are you sure you have 3.31 ?

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Yes, specifically looked for them when I bought the truck. At the time was going with 35's and figured that would put my RPM's in the perfect range for the speed I drive and still keep good fuel mileage.



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post #7 of 12 Old 08-26-2012, 06:02 AM
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Do you have the 20" wheel option? if so the stock tires are dang near 35" tall anyway so putting 37's shouldn't make a huge difference.

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post #8 of 12 Old 08-26-2012, 09:44 AM
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i think the 20" wheel option only comes with 3:55's

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post #9 of 12 Old 08-26-2012, 10:23 AM Thread Starter
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Quote:
Originally Posted by Rob View Post
Do you have the 20" wheel option? if so the stock tires are dang near 35" tall anyway so putting 37's shouldn't make a huge difference.
No, I have the 18" wheels



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post #10 of 12 Old 08-28-2012, 09:03 AM Thread Starter
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Any others running 3:31's

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