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Old 03-25-2014, 05:46 PM
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Gear question

2009 F250 4x4
7" Icon lift
37/13.50 mud grapplers
H&S tuned/deleted. 5" exhaust.

So its the first time ive towed since i put the bigger lift on. I knew it would be different, because daily driving i can tell the heaviness of the tires/wheels.
Anyway i towed a buddies 7.3L excursion home about 100 miles. I have a 24ft gooseneck that probably weighs around 4000lbs or so, i dont know.

Anyway it pulled great and i ran 70-80mph most of the way. My boost really spikes up though, more so then before (obviously tire weight i know), but seems like even towing at lower speeds on the two lane roads id see 25-33lbs of boost. Seems like a lot. Would a regear eventually be something to look into. And if so which gears to swap with. Theres a ton of opinions on the topic that ive already read. i came from gassers and 4.56 was kind of the sweet spot for 37s.
Id like some real world experience knowledge on the topic. Thanks

Oh and window sticker i found of my truck says 3.73 gears....I dont think id be that happy with keeping these forever, i know ive read some say thats plenty, but i think i disagree

Last edited by Big_Smokey; 03-25-2014 at 05:54 PM.
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Old 03-26-2014, 03:23 AM
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What size tires did you have beffore? Do you prefer it to be geared more like stock or how it was with your last tires?
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Old 03-26-2014, 03:39 AM
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35/12.50/18 It was better with 35s,
Went th 37/13.50/20, so the wheels also changed weight
Stock it was a flat beast, which I liked the best. I'm up for a compromise though
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Old 03-26-2014, 06:19 AM
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Quote:
Originally Posted by Big_Smokey View Post
35/12.50/18 It was better with 35s,
Went th 37/13.50/20, so the wheels also changed weight
Stock it was a flat beast, which I liked the best. I'm up for a compromise though
Ok, easy to calculate....new tire size divided by old tire size multiplied by current gear ratio. So 37/33x3.73 = 4.18 so 4.10s or 4.11s. I can't remeber which is available for this rear end would be very close to a stock setup. That would be slightly less gear (you would turn a little RPM at the same speed) than stock. On a SRW F250, if you wanted more gear, I am not sure what is available but maybe 4.33 or somewhere around there (you would be turning more RPM than stock at the same speed).
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Old 03-26-2014, 05:36 PM
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Cool. Im just digging into the gear thing. Id really like to install my own, ive did everything else so far....plus we have a jeep id like to do as well. Ive never seen that equation before. Logged in the brain for now. Ill do some more searching on available options.. Thanks for your help
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Old 03-26-2014, 05:39 PM
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Quote:
Originally Posted by Big_Smokey View Post
Cool. Im just digging into the gear thing. Id really like to install my own, ive did everything else so far....plus we have a jeep id like to do as well. Ive never seen that equation before. Logged in the brain for now. Ill do some more searching on available options.. Thanks for your help
My truck hasn't had stock tires since '08 so I cant remember the exact size from the factory. Before you do the final gear decision, make sure the factories are 33". I think that is it, but they might have been 32.5"
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Old 03-26-2014, 05:43 PM
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I agree with B5, 4:10s if you can get them.....
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Old 03-26-2014, 06:22 PM
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32.5 is pretty close. Calculates out to 32.6

Pretty sure 410, but havent had any time to dig around yet. Ill probably hold off a bit as id like to do a locker as well while im in there
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Old 03-26-2014, 07:18 PM
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Yes a locker is a good idea as well

Last edited by Ontario Trucker; 03-29-2014 at 06:05 AM.
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Old 03-26-2014, 07:41 PM
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That actually calculates out to 4.23 so 4.10 would be in the middle of stock and 35s. 4.33s are available for the dually F450s, but I don't know if available for yours. I still kind a lean towards the 4.10s cause you can always add a little powa if need a little more to get them big ole tires rollin, but you will still keep your RPMs on the highway in a good fuel economy range.
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