3:55 Ration = Fuel Savings?

[Tiberian]

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?

[smokersteve]

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?

[Galaxie]

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!

[smokersteve]

Stick with you 3.73 gears. And buying 2 sets of gears is very pricey.

Originally Posted by Galaxie

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?

[Galaxie]

Originally Posted by smokersteve

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!

[Tiberian]

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.

[bfrank81]

I saw on Trucks that changing to manual hubs and swapping the cooling fan to an electric fan both do wonders to reduce MPG.