Changing rears in my dually - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 05-13-2013, 02:58 PM Thread Starter
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Changing rears in my dually

I was wondering if anyone has ever put in a different gear stack in the rear to either help with fuel econ or for towing purposes. I currently have 410 rear in my 05 dually. And towing sometiing mayb 5 times a year and only a few thousand lb loads at most. But now ive currently started daily driving mine and fuel ecom isnt the greatest ~12-13 on a great tank. I know putting longer gear ratio for highway driving would help out loads. My question is has anyone ever done this or does everyone always just deal with it

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post #2 of 5 Old 05-13-2013, 05:21 PM
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I believe most say that it will take a very long time to gain the cost back from a gear change. Slightly larger tires to offset the 410s might be a better option, idk. Thats kind of what im getting ready to do. Im putting 315s on but also adding a few inches of lift. I doubt I will gain anything.

33s may or may not help you, but will make it look better imo

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post #3 of 5 Old 05-15-2013, 08:51 AM
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Here is a calculator that will show you the effect that a taller tire will have on your gear ratio.

Tire/Gear Calculator
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post #4 of 5 Old 05-21-2013, 10:14 AM
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I'm looking to swap my 3.73 rear end to either a 410 or 430 rear end. I have 37s on my 373s and its just not enough gear.
To answer your original question, yes you can change but its going to cost you.

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post #5 of 5 Old 05-31-2013, 08:05 PM
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I have been thinking of going to a taller skinny tire like a 255/80 17 on my truck with 4.10's that would be the same as going to a 3.90 gear. going wider to go taller often doesn't help mpg. and by staying skinny do not need any lift or rear spacers. only issues is currently bfg mt2 (very aggresive tread) is the only tire available in a 255/80 17 or 255/85 16. it is a 33+ inch tire.

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