Gear Ratios: 3.31 vs. 3.55 - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 07-17-2013, 01:28 PM Thread Starter
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Gear Ratios: 3.31 vs. 3.55

I'm looking at 2 trucks tomorrow & one of them has the 3.31 and the other one has the 3.55. They are both 6.4L's. I am not real familiar with the gear ratios and what they mean, so I am looking for a bit of advice.

I use my truck for towing a mid size trailer (~4,000lbs), and most of that is city miles. Ultimately, I am looking for better gas mileage, not power, though I am sure that they are related.

So, what's your 2 cents?

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post #2 of 12 Old 07-17-2013, 02:04 PM
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I'd get the taller gears since you tow very lightly and are wanting better fuel economy. Delete that dpf, get s tuner and you should really see a bump in mpgs. Post some pics if you get it!

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post #3 of 12 Old 07-17-2013, 02:17 PM Thread Starter
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What do you mean by 'taller' gears?

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post #4 of 12 Old 07-17-2013, 02:24 PM
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Bigger gears.......3:55
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post #5 of 12 Old 07-17-2013, 04:23 PM
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Quote:
Originally Posted by jumpingjay View Post
What do you mean by 'taller' gears?
My bad, taller gears=longer legs lol. I'd get the 3.31

05 F-250 Crew Cab Short Bed
ARPs w/OEM Gaskets
MTW Stage 2 w/batmowheel
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BPD Updated umm...Everything
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Egr deleted
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Edge CTS
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X3 w/Matts SRL+/SRLxx and Tow Tunes
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post #6 of 12 Old 07-17-2013, 08:00 PM
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I would suggest 3:31 gears if you aren't towing heavy. You'll save fuel.

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post #7 of 12 Old 07-17-2013, 09:12 PM
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3.55 is lower than 3.31's I see that you live in GA, and the best I remember GA.
has lots of hills, so if your in a lot of stop and go in town the 3.55 would be better.
If it were me I would get the 3.55's because before long you may get a bigger trailer.
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post #8 of 12 Old 07-18-2013, 12:50 PM
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I would say go with the 3:55's.


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2008 (Job 1) F250 King ranch 4x4, snow plow prep package with 2.5 level. Black Maxx, B&W Diehard platinums. Dieselsite coolant and transmission filters, NCU Motorsports/amsoil oil bypass kit. Turbo blankets, 5.5 PMF traction
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post #9 of 12 Old 07-19-2013, 08:11 AM Thread Starter
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Well, I went with the 3:55, mostly because I like the truck better. Hopefully I can get the mileage where I want. I drove it home 350 miles last night, towing the car that I had driven up there to get it & I got 13.5 mpg, so it's time for me to start modding!

I will create another thread to formally introduce myself to the forum since I am not the proud owner of a Powerstroke!

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post #10 of 12 Old 07-19-2013, 12:18 PM
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You got 13.5 stock? That's pretty good. I get about 14.5 to 15 and I'm deleted. Although that's a good 40/60 mix of city/highway driving.


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2008 (Job 1) F250 King ranch 4x4, snow plow prep package with 2.5 level. Black Maxx, B&W Diehard platinums. Dieselsite coolant and transmission filters, NCU Motorsports/amsoil oil bypass kit. Turbo blankets, 5.5 PMF traction
Please collect and message me Shell, Rotella oil cap codes aka "my miles matter" I'm trying to save up for a hat or something.
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