3:55 Ration = Fuel Savings? - Ford Powerstroke Diesel Forum
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post #1 of 7 Old 01-08-2011, 03:46 PM Thread Starter
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3:55 Ration = Fuel Savings?

I have a 2003 F250 6.0 with 3.73 gears. I use to do a bunch of towing but now I might use the trailer 3 times a year so the rest of the time the truck is my daily driver.

Would swapping to 3:55/3:54 gears help increase the MPG?
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post #2 of 7 Old 01-08-2011, 04:10 PM
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Depends on the use. That is too much strain at the lower rpms.

Search on google and you will find many posts on what to do for mpg.

tuning is a big part.

Is your truck 100% stock?
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post #3 of 7 Old 01-08-2011, 04:53 PM
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I dont think it will be enough of a change to make it worth while. Also, I agree, start with your tuning. When I was racing a lot, I was going back and forth from 3:55, 3:73, to 4:10s for some different outcomes at the finish line and different tires.

I am thinking for your street driving and going after some more milage, it wouldnt be worth doing 3:55s. If you are a 4X4, it is really not worth it in my mind. What size tires are you running? Just changing that might help out a lot as well! On my Mustang, I was traping at the same speed with 3:73s and a 28" slick as I was with 3:55s and a 26" slick.

Just my thoughts!

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post #4 of 7 Old 01-08-2011, 05:50 PM
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Stick with you 3.73 gears. And buying 2 sets of gears is very pricey.


Quote:
Originally Posted by Galaxie View Post
I dont think it will be enough of a change to make it worth while. Also, I agree, start with your tuning. When I was racing a lot, I was going back and forth from 3:55, 3:73, to 4:10s for some different outcomes at the finish line and different tires.
What was better with the gears?
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post #5 of 7 Old 01-08-2011, 05:53 PM
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Quote:
Originally Posted by smokersteve View Post
Stick with you 3.73 gears. And buying 2 sets of gears is very pricey.




What was better with the gears?
Results were about the same with 3:55s and a 26" tire vs the 3:73s and 28". I ran out of gear with the 3:73s and the 26" tire. The 4:10s are now in it and no spray. I can run a 26" tire and just hit red line at the line. 100% NA and slower now!

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post #6 of 7 Old 01-08-2011, 06:02 PM Thread Starter
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Thanks for the comments. Mine is a 4x4. I've got an Edge programmer with the in cab monitor. Other than that I have installed a Air Raid intake to get more air into the motor. I'm one size over the stock tire size.

Upgrade I want to do next is a 4" exhaust system.
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post #7 of 7 Old 01-08-2011, 06:11 PM
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I saw on Trucks that changing to manual hubs and swapping the cooling fan to an electric fan both do wonders to reduce MPG.

Brian


'05 F250 Harley-Davidson

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