Gear ratio for 37s? - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 02-04-2020, 08:14 PM Thread Starter
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Gear ratio for 37s?

Hey y’all, new to the group comin’ at ya from Magnolia, TX.

Just put 37s on my 1 ton long bed, as expected, she’s sluggish.. Currently running the factory 3.55. Weight reduction, tuned, and 5”. What gears are you fellas running with 37s, and do you like’em.. Pros/Cons


Thanks for any help/feedback in advance 👍🏼
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post #2 of 9 Old 02-04-2020, 10:27 PM
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I run the same gears(3.55) and what not with my 37’s. Got used to how to apply the power and see no need at all to change. Took a little getting used to though, I will say that.


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post #3 of 9 Old 02-04-2020, 10:33 PM
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To get you back to a stock ratio, you'd need 4.09190..... so somewhere in that area would get you back to a stock feeling truck but with 37" tires.

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post #4 of 9 Old 02-05-2020, 05:42 PM
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Im curious as to what 37's and 4.30's would be like....Considering 4.30 is an OEM gear and all.

Thoughts?

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post #5 of 9 Old 02-05-2020, 06:46 PM
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Quote:
Originally Posted by BMLS View Post
Im curious as to what 37's and 4.30's would be like....Considering 4.30 is an OEM gear and all.

Thoughts?
Use the formula
RPM= MPH x axle gear ratio x transmission gear ratio x 336 divided by tire diameter in inches

This website does it for you Gear Ratio Calculator

6R140 gear ratios 1st-3.97 2nd-2.32 3rd-1.52 4th-1.15 5th-.86 6th-.67

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post #6 of 9 Old 02-12-2020, 05:07 PM
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Quote:
Originally Posted by 00t444e View Post
Use the formula
RPM= MPH x axle gear ratio x transmission gear ratio x 336 divided by tire diameter in inches

This website does it for you Gear Ratio Calculator

6R140 gear ratios 1st-3.97 2nd-2.32 3rd-1.52 4th-1.15 5th-.86 6th-.67
Good info, thank you!

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post #7 of 9 Old 02-13-2020, 12:50 PM
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I run 38's, never changed the gears and have no issues.

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post #8 of 9 Old 02-13-2020, 08:15 PM
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I got my tunes modified and it helped. Shift point mph raised up, but our transmission learns so fast it did not last long. I want to swap gears also but that top end rpm at 100 mph is still decent with 3.55 gears

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post #9 of 9 Old 02-24-2020, 09:58 AM
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Quote:
Originally Posted by BMLS View Post
Im curious as to what 37's and 4.30's would be like....Considering 4.30 is an OEM gear and all.



Thoughts?


I have 37’s on a 7” lift and decided to go with 4.30(Yukon Gears). Love it! Really glad I didn’t go with anything less.


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