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the best gear ratio 1996-f250/460

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Old 06-17-2010, 09:36 PM
So-Cal Sancho So-Cal Sancho is offline
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the best gear ratio 1996-f250/460

I know this has been beaten to death but with a lot of reading i came up with these numbers. Just want an opinion on what would be the best long term application for towing a 8000lb. toyhauler.

from what i found. It is 242 hp @ 4000, and 394 lbs-ft @ 2200 rpm for California. 7.5L mass air

stock tire size was-235/85-r16 which equals 31.7"
my tires are 285/75-r16 which equals 32.8"
so using rpm calculators with a E4OD final drive ratio of.71

this is what i came up with for stock tires.
65mph x 31.7" tires x .71 drive x 3.55 gears = 1736 RPM
65mph x 31.7" tires x .71 drive x 4.10 gears = 2005 RPM

and now my tires:
65mph x 32.8" tires x .71 drive x 3.55 gears = 1678 RPM
65mph x 32.8" tires x .71 drive x 4.10 gears = 1938 RPM
65mph x 32.8" tires x .71 drive x 4.56 gears = 2155 RPM

so with all this info what do you guys think ? i was gonna do 4:10 but now maybe 4.56 which seems closer to peak horsepower.
but not in overdrive at a 1 to 1 ratio the rpms look like

3.55 = 2363 rpm and at 4.10 = 2730 and at 4.56 = 3036.
this is all while towing a 8000 lb toyhauler. any Ideas?
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Old 06-17-2010, 10:26 PM
poocher pup poocher pup is offline
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if you can afford the gas go for it. but i'd just go get a diesel truck if you're going to tow all the time.
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Old 06-17-2010, 11:00 PM
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General consensus on here is the 460 will consume a lot of fuel with 4.10 gears or better and when towing but you're not buying one of the biggest gasoline engines ever produced for fuel milage so that's probably not a big concern. I'd say you want 4.10 gears for sure.
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Old 06-18-2010, 12:11 AM
capn kirk capn kirk is offline
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i wouldnt swap your until i tried pulling the trailer or one of similar weight, that said 4.10s do good up to 33" tires with a trailer under 10k lbs, my 3.73s had no problem with close to 10klb trailer when i had 33" tires
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Old 06-18-2010, 06:44 AM
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For that weight trailer, Ford recomended the 410. anything more would only tend to be a waste of fuel...I would'nt go for the 456
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Old 06-18-2010, 10:51 AM
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One other thing to worry about... with some transmissions the overdrive is actually weaker and towing in OD will lead to early failure. I know for a fact the ZF is one, but I don't know if the E4OD is or not. I would head over to the tranny/axle/t-case forum here and see if you can get Mark Kovalsky's attention. Ask him if there is a problem towing in overdrive with an E4OD.

But I agree with the 4.10 gear ratio.
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Old 06-23-2010, 09:41 AM
CRABBO CRABBO is offline
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YOUR PROBLEM IS THAT THE 460 IS NOT EFFICIENT UNTIL ABOUT 2800 RPM,,I WOULD DEFINATELY NOT PULL IN O.D. ON AN E4OD PERIOD..
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