Gearing change
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Joined: Dec 2005
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Gearing change
I do lots of freeway commuting in my 1986 extracab F-250 (460c.i)...Would changing the rear gear help the gas mileage? Right now it seems like the motor is screaming at 70mph...I believe it has 4:11 in it now...I only pull a small 6 X 12 on occasion....
What gearing would you suggest?
What gearing would you suggest?
Post Fiend
Joined: Mar 2002
Posts: 19,402
Likes: 38
From: Bonita Springs FL
The ones from a Ranger with a 4 banger and a 5 speed. 
Seriously, lower gears will give you slightly better mileage. But you won't notice much of a difference between 4.10's and 3.55's. Maybe 1mpg? Probably not even enough to justify the expense of a gear swap. Plus, if it's 4x4, you need to change front and back.
Seriously, lower gears will give you slightly better mileage. But you won't notice much of a difference between 4.10's and 3.55's. Maybe 1mpg? Probably not even enough to justify the expense of a gear swap. Plus, if it's 4x4, you need to change front and back.
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
If you wanted to go with 3:55's I have the set I pulled from my 85 F-250 4x4 that might work. Dirt cheap if you are interested. You could also try running a taller/narrower tire to bring down your freeway rpm's. I went from 3:55's to 4:10's and noticed an improvement in city mileage, but the rpms are at 3000 at 70mph.
More Turbo
Joined: Apr 2006
Posts: 560
Likes: 0
From: Radisson Sask
Hey Guys
One thing I did hear about a long time ago was using an old 3 sp standard tranny mounted backwards to use like an overdrive transmission. Not sure if this would work or not. Has anyone else ever heard of this type of Hillbilly overdrive.
Duncan
One thing I did hear about a long time ago was using an old 3 sp standard tranny mounted backwards to use like an overdrive transmission. Not sure if this would work or not. Has anyone else ever heard of this type of Hillbilly overdrive.
Duncan
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