Gearing
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
How low do you want to go? I know I've seen 4.56 available for the 10.5" rear, and I think I've seen 4.88's and maybe even 5.14's.
Way too low to run down the highway with 31" tires.
Way too low to run down the highway with 31" tires.
Thread Starter
|
Posting Guru
Joined: Mar 2005
Posts: 1,460
Likes: 0
OK.......I dont' do hardly any towing and was looking for increased gas mileage and just wanted to see my options........70mph with 2,000rpm's would be 3.73 right? What would be the best for me?
Post Fiend
Joined: Jul 2005
Posts: 14,582
Likes: 12
From: 21791
yes but with a high gearing setup (low number) you wont want to haul anything much, because it is much more stressful on the drivetrain components than a 4.10 would be. it would be nice when you are crusing, you could be at 75 mph at the same engine RPM when with the old gears you were at 65 
New User
Joined: Sep 2005
Posts: 1
Likes: 0
I have a '94 F350 Dually w/ 190,000 miles. My milage is only 10-12 mpg. With saddle tanks and $2.85/gal., it is an expensive truck to drive. About $70 to fill up now. I am interested to find out if my ol' truck can handle a rear end ratio change this late in her life. It would help out my "back pocket." I have 4:10's and want to go to 3:73's.
Trending Topics
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Welcome to FTE dinka0702 Please take a moment to read our forum guidelines.
4.10 to 3.73 is a pretty small difference...probably wouldn't ever offset the cost of the gears in fuel savings.
4.10 to 3.73 is a pretty small difference...probably wouldn't ever offset the cost of the gears in fuel savings.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Thread Starter
|
Posting Guru
Joined: Mar 2005
Posts: 1,460
Likes: 0
Originally Posted by cookie88
Oh, you want higher (numerically lower) gears. Something like a 3.55 or 3.27 gear. The lower gears (higher numbers) will kill your milage on the freeway.
Posting Guru
Joined: Aug 2004
Posts: 2,417
Likes: 4
From: Braham MN
I know of a 2x4 that has 3.08's claim he gets 28 MPG, but has to really ease into the throttle. I actually lost milage with my 3:55's, but I drive it hard, so it took more to get going, I gained milage on the open road, but made up for it in more used to get rolling.
Diesel Rod
Diesel Rod