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?

 

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.

 

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.

 

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

 

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

 

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.

 

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..