Axle, gear ratio change for economy - Ford Powerstroke Diesel Forum

 
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post #1 of 6 Old 01-08-2013, 01:57 PM Thread Starter
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Axle, gear ratio change for economy

Can anyone direct me towards a source for understanding axle/gear ratio's and the effect on fuel economy.
Currently we have 4:10's in our E450, performance is far more than adequate and I am curious as to how going to a lower ratio (?) might change things.

I am in the process of looking closely at a Gear Vendors aux transmission and the reduction in rpms is significant, got to thinking that a rear end change might be a simpler way to get a few more miles per gallon.
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post #2 of 6 Old 02-13-2013, 07:40 AM
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I got a 2003 F-350 DRW with 410's also... Seeing that I don't hardly tow anything. Iam going with 373 gears and Detroit True-Trac's front and rear... Been told, I can expect anywhere from 3-5 mpg increase... As far as understanding what the differences are. Just go to whatever gears and differentials you want and read what their advantages are...

Last edited by hdwindjammer; 02-13-2013 at 07:44 AM.
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post #3 of 6 Old 02-13-2013, 09:17 AM
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Re: Axle, gear ratio change for economy

You want between 1750 and 2k rpm while cruising. Too little or high will make your economy suffer

I made my Samsung SGH-I997 send this.



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post #4 of 6 Old 02-13-2013, 09:44 AM
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Right now when Iam crusing at 60mph my tack reads 2000 rpm's. Even with all the engine mods, the milege is not where it should be... The gear changinig should make a hellov a difference...in MGP... Plus Iam going with the Tru Trac's...

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post #5 of 6 Old 02-13-2013, 09:49 AM
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Quote:
Originally Posted by E450psd View Post
Can anyone direct me towards a source for understanding axle/gear ratio's and the effect on fuel economy.
Currently we have 4:10's in our E450, performance is far more than adequate and I am curious as to how going to a lower ratio (?) might change things.

I am in the process of looking closely at a Gear Vendors aux transmission and the reduction in rpms is significant, got to thinking that a rear end change might be a simpler way to get a few more miles per gallon.
i believe you mean higher ratio. yes gear vendors are expensive, but if you've never swapped gearsets you should probably pay a shop to do it and then that gets expensive too.

here is a link to see how much a ratio will affect anything.

Gear Ratio Calculator

94.5 F250 Reg Cab 4x4 5 speed 4.10 276000 plus miles

97 F350 Crew Cab LB 4x4 5 speed 3.55 320000 plus miles (parts truck)



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post #6 of 6 Old 02-13-2013, 12:14 PM
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Re: Axle, gear ratio change for economy

You want between 1750 and 2k rpm while cruising. Too little or high will make your economy suffer

I made my Samsung SGH-I997 send this.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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