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Old 07-21-2014, 08:59 PM
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37's and gearing

So I just bought a used 13' f250 and it came with a 6" lift and 37's. Definitely does not feel like the gears were redone after the left.
Can anyone help me out on what gears I need to compensate for the tires and allow this truck to run properly?
Also, what will I need to make the computer be alright with the gear change?
And lastly, will changing the gear void my powertrain warranty?


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Old 07-21-2014, 09:00 PM
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37's and gearing-imageuploadedbyag-free1406005174.823379.jpg
Just thought I would upload a picture so y'all can see what I'm working with.


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Old 07-21-2014, 09:01 PM
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And do trucks with 37's tow fine? I have to move a 5th wheel camper for my buddy sometime soon.


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Old 07-21-2014, 10:28 PM
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Truck in my Sig has an 8" lift with 37's. I bumped up the stock gearing from 3.73 to 4.30's. Made a big difference off the line and up hills. I pull a 7-8k lb boat loaded. That was with the 6.0 of course and it pulled like a raped ape when it wasn't blown up.
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Old 07-22-2014, 02:44 AM
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Quote:
Originally Posted by Y&R0864 View Post
And do trucks with 37's tow fine? I have to move a 5th wheel camper for my buddy sometime soon.


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NO way would I move a 5er with what you have. Even "IF" you could back up under the rig it will be extremely nose high You to level it out you'd have to have the hitch at it's lowest setting and the gap between the top of your bed and tailgate would be very small. You stand a very good risk of damaging your buddy's trailer and your truck. Depending on the weight of the 5er and height of the nose on the front of the rig your truck will struggle...especially if there are any hills to speak of.

There was a fella down here in S. Florida that didn't have as much lift and smaller tires that had to remove everything to head back west.

You have to decide what you want... When you lift a truck and install larger tires you put a lot of strain on your axles, bearings, brakes, ujoints, transmission, engine...etc. Don't get me wrong. I like the look of a lifted truck, but lose some of the utility and intended purpose of what it was intended for while gaining some capabilities.

The amount of power you lose through gearing, I'd out pull you with my stock 08 6.7 cummins even if you had a higher output ford setup.
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Old 07-22-2014, 03:33 AM
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Well the regearing is inevitable. But just wanting to know if I will need anything for the electronic side of things or if that will all just work fine?
And I guess I'll just keep using the old 6 speed cummins for towing.


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Old 07-22-2014, 06:27 PM
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6.4 liter here. Had 37's with 3.73s hooked up 9k BBQ trailer. Couldn't pull faster than 55. Kept looking for gear and got hot. Put 4.30s in a month ago. All I can say is wow. So much more power. Sucks fuel unloaded at70+ moth! but so much more fun to drive. No tunes.
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Old 07-22-2014, 06:45 PM
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the rear end VSS (speed sensor ) reads after the gears so it only reads the axle shaft RPM's and won't read off with the gear swap
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Old 07-22-2014, 06:46 PM
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Deuce 50 what did your gears run$$
??
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Old 07-22-2014, 07:39 PM
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That's right. If you have the hypertech inline behind dash calibrator you just change for tires, don't mess with gearing ( I learned that the frustrating way).

For my gears- let me think 1500 for 4.30s, master install kit, lube,detroit, install and mag hytec diff cover. That's just the rear axle too. I haven't done front axle yet. It took the tech about 3 days to get the setup right. I did it at 4wp in Memphis.mthe tech there is extremely particular and wouldn't let it go unless it was just right. Not sure about the 6.7s but I think the axle is the same as the 6.4 and it's a "bastard gear" or something like that because the parts are interchangeable so he went with the 10.25 internals or something along those lines to build up the guts.
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