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5.0L New gears, ideas?

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Old 09-17-2015, 10:20 PM
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Technically you could do a lot of stuff that would increase your capability. But the numbers that insurance, motor carrier inspectors, and vehicle inspectors care about are what is on your sticker.

You could beef up the frame, swap axles/suspension, and change your gears. It's been done before. Just doesn't make it legal.
Old 09-17-2015, 10:27 PM
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Originally Posted by sloate9471
I have a 3013 SuperCab STX with 3.31. Will going to 3.73 allow me to tow a heavier trailer? I installed a Blue Ox underbed Gooseneck hitch.
Originally Posted by SteveLord
But if you put the sticker and legality aside, then it could tow more then right? If that is all that is different between some of these configurations.
Not necessarily more, but it would tow easier with lower gears.
Originally Posted by SteveLord
Seems like that is all that was being asked.
That's all that was answered...I just added a little legal disclaimer.


Originally Posted by SteveLord
Regardless, I would at least see it as being able to tow your stickered rate a lot easier.
That's what I said.
Originally Posted by NASSTY
Your truck will tow better with lower gears. But the tow #s that your truck can legally tow won't change. If your truck was rated to tow 8k lbs , your limit would still be 8k lbs.
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Old 09-18-2015, 10:42 AM
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Okay, if I understand everyone's posts:

It all comes down to the sticker on the doorpost, and legal liability in court and/or with my insurance carrier if I were to be involved in a collision that caused personal or property damage while towing a trailer that was outside the limits on the sticker.

My question was regarding the Ford Engineer's rating of gears/motor/frame combinations, and not the legal aspects. That being said, I do appreciate the warnings regarding the potential for liability in the case of a collision or other catastrophe that may cause damage.
Old 09-18-2015, 08:45 PM
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My truck is going in next week for 4.56 gears. I live in the mountains so I decided on 4.56. It is also getting a F150 2-3 inch lift, Helwig sway bar kit front and back and new rotors and pads. I am running 34 inch tires on stock rims. I have been fooling around with CAI's and a Livewire and some programs but have yet to find the happy zone on the latter. Working on it this weekend.
Old 09-18-2015, 08:47 PM
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Is it worth it enough to void the powertrain warranty? That's my only problem or I would love to jump from 3.55 to 4.56 gears
Old 09-18-2015, 09:42 PM
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Originally Posted by maz226
Is it worth it enough to void the powertrain warranty? That's my only problem or I would love to jump from 3.55 to 4.56 gears
In most cases...Yes. Because the chance of a gear swap causing powertrain issues is slim to none.
Old 09-18-2015, 09:56 PM
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Originally Posted by NASSTY
In most cases...Yes. Because the chance of a gear swap causing powertrain issues is slim to none.
If done properly. Take it to a trusted shop that deals in regearing. But yeah, if they void the warranty for a gear change then they are just being lazy.
Old 09-19-2015, 09:16 AM
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Originally Posted by maz226
Is it worth it enough to void the powertrain warranty? That's my only problem or I would love to jump from 3.55 to 4.56 gears
That is a risk I am taking. No doubt. I am having the work done by one of the best 4X4 shops in Denver and they have a warranty. This is not my daily driver so the time portion of the warranty will expire long before the mileage portion does.
Old 09-19-2015, 09:18 AM
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Originally Posted by MisterScott
My truck is going in next week for 4.56 gears. I live in the mountains so I decided on 4.56. It is also getting a F150 2-3 inch lift, Helwig sway bar kit front and back and new rotors and pads. I am running 34 inch tires on stock rims. I have been fooling around with CAI's and a Livewire and some programs but have yet to find the happy zone on the latter. Working on it this weekend.
I was going to work on it this weekend but an upgrade to Windows 10 on my work computer has resulted in issues recognizing the Livewire programmer. I despise Microsoft.
Old 09-19-2015, 02:05 PM
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I[m getting the parts together to change from 3:55s to 4:10s and add an Eaton TruTrac in the rear. I'm not doing it to haul more. I'm doing it to haul better. I'm also getting tow mirrors. If done correctly, there shouldn't be any problem with the differentials ever. If I understand the warranty issue correctly, the only thing that would be voided is problems directly atttributable to the gear change. Any other issues would still be covered.


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