Gearing
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Joined: May 2001
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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.
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Posting Guru
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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?
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Joined: Jul 2005
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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 
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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.
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FTE Leadership Emeritus
Joined: May 2001
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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.
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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.
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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.
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