Mileage vs. rear gears - Ford Powerstroke Diesel Forum

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post #1 of 14 Old 10-21-2007, 05:00 PM Thread Starter
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Mileage vs. rear gears

I have a 2wd Ex with 3.73 gears right now. If I was to install 3.55 gear set would I be able to get the same mileage at 80 as I do at 70 right now? I would like to get a little better mpg as but don't want to suffer if I have something in tow. I'm I just pissing in the wind?

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post #2 of 14 Old 10-21-2007, 05:01 PM
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I don't think you would be too bad off. A good number of Dodges came with the 3.55, so I am sure it is stout enough to pull. It would be a little worse if you are in a hilly area. The extra MPG would be nice though.

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post #3 of 14 Old 10-21-2007, 05:05 PM
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will you be doing the work yourself? because the going rate to do gears is around 600 bucks per axle just for labor... gears would prob be another 400-500 with a master install kit....
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post #4 of 14 Old 10-21-2007, 05:07 PM
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wow that'd take a lotta extra MPG to make up for the cost!
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post #5 of 14 Old 10-21-2007, 05:11 PM
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wow that'd take a lotta extra MPG to make up for the cost!
exactly my point....plus you might experience worst millage.... it will take your engine just slightly more HP to get you up and running so for stop and go traffic you will get worse milage but highway you will prob get a lil better but not that much... maybe 1mpg
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post #6 of 14 Old 10-21-2007, 05:13 PM
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ouch. . . .
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post #7 of 14 Old 10-21-2007, 05:41 PM Thread Starter
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It wouldn't be worth the money for 1mpg. I would be doing to gears myself if I choose to go that route. I have all the pinion depth tools, so the cost of labor would be free though. I may just save up for new injectors seeing as how I'm already at 166,000. All of my friends with Dodges keep telling my to go with the 3.55s, but they also make more power.

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post #8 of 14 Old 10-21-2007, 11:30 PM
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i was thinkin about throwin some 4:10's in my truck any one know what they run. and how much of a difference it will make for speed on the high way

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post #9 of 14 Old 10-22-2007, 11:37 AM Thread Starter
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I have 265/75/16 with the 3.73 gear and at 70mph I'm running 2000rpm. I was hoping to see 2000rpm at 80mph, but the world may never know.

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post #10 of 14 Old 10-22-2007, 11:53 AM
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Running 4.10's I see about 2200 at 70 and at 80 all that I see is the fuel guage dropping.

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