ULTIMATE gear/tire/final drive ratio comparison chart - Diesel Forum - TheDieselStop.com
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6.7L Power Stroke Engine and Drivetrain Discussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.

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Old 12-18-2010, 01:42 AM   #1 (permalink)
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ULTIMATE gear/tire/final drive ratio comparison chart

Ok so i decided to make a chart to compare the different standard tire and gear packages. This chart also includes a comparison if you went from standard factory tires sizes up to 34"&35". There are also comparisons with the 2010 super duty and the two other major brands with standard options.

I am basing this on what i feel is the most common trucks. F250/350 SRW Diesel 4X4 Lariat/King Ranch.

Let me know if i messed anything up.
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File Type: pdf 2011 Ford Super duty final drive ratio comparison.pdf (140.6 KB, 858 views)
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Last edited by sleepersilverado; 12-21-2010 at 09:40 PM. Reason: sorry somehow dodge was left out fixed now/ typos 12.21.10
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Old 12-19-2010, 12:36 AM   #2 (permalink)
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awesome writeup sleeper, it's surprising the difference a couple inches in diameter makes in rpms
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Old 12-19-2010, 10:33 AM   #3 (permalink)
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I have a spread sheet with formulas that I use to figure gear ratios, speed & RPM in each gear along with different tire sizes. Just put in a couple of numbers and it will automatically calculate everything. If anyone's interested?
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Old 12-19-2010, 01:22 PM   #4 (permalink)
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very usefull sleeper
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Old 12-20-2010, 01:14 AM   #5 (permalink)
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Great info, thanks for doing this.
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Old 12-20-2010, 08:33 PM   #6 (permalink)
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With all the questions about 3.31's, tire sizes, and me having the same questions i decided to do this. That being said i find that comparing the 3.31's w/ 35's vs. the 2010 6.4 and the other two major brands interesting. There has been debate about having 3.31's and going to a larger tire. Looking at the final drive ratio the shorter gear does not look so bad on paper.
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Old 12-21-2010, 07:08 AM   #7 (permalink)
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Quote:
Originally Posted by sleepersilverado View Post
Ok so i decided to make a chart to compare the different standard tire and gear packages. This chart also includes a comparison if you went from standard factory tires sizes up to 34"&35". There are also comparisons with the 2010 super duty and the two other major brands with standard options.

I am basing this on what i feel is the most common trucks. F250/350 SRW Diesel 4X4 Lariat/King Ranch.

Let me know if i messed anything up.

thanks for the info..it helps.. I have the 325 60 R20's on stock rims w/3.55's. Top left of your page reads 62 vs 65 .. but I knew what you were getting at. Thanks Jeff
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Old 12-21-2010, 09:32 PM   #8 (permalink)
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yea there are a few mis numbers. i found one that read 111 rpm's. the numbers started to run together with 3 programs running on one screen.

Fixed few typos
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Old 01-06-2011, 09:17 PM   #9 (permalink)
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I have an 02 f250 4x4 7.3. went from 285-16" to 305-20". does anyone know what the best ratio is? Either way, need to work on rearend.
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Old 01-06-2011, 10:20 PM   #10 (permalink)
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depends what you are trying to accomplish. If you are just trying to get back to your original ratio use this site. Gear Calculator
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Old 01-06-2011, 10:36 PM   #11 (permalink)
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Thanks for the site. I'm looking for both power and performance. I pull a 34' travel trailer 8500 lbs.
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