37s which gears from factory? - Ford Powerstroke Diesel Forum
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Old 07-18-2013, 03:41 AM
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37s which gears from factory?

I'm fixing to bite the bullet and buy a 2013 f.250 and plan on running 37s within the 1st 3 months after getting it. I pull a goosneck about once a month total weight loaded down 15k max including trailer. Would the 3:55s be the best gear ratio for me?
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Old 07-18-2013, 05:41 AM
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Yes.......
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Old 07-18-2013, 05:46 AM
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That's what I figured just wanted to make sure. The whole gearing thing confuses me
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Old 07-18-2013, 12:40 PM
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I'd just regear to 3.73's personally afterwards but that's just me. It will definitely help if you're pulling 15k regularly and the gear prices from Ford have dropped to like 1/3 of what they were a year ago.
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Old 07-18-2013, 12:43 PM
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Originally Posted by Axis2011KR View Post
I'd just regear to 3.73's personally afterwards but that's just me. It will definitely help if you're pulling 15k regularly and the gear prices from Ford have dropped to like 1/3 of what they were a year ago.
How much would the MPG's drop going from 3:55's to 3:73's ???
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Old 07-18-2013, 12:50 PM
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We've got a 6th gear now so it's not nearly as bad as it used to be with overdrive. If you want it to drive the same performance wise it's:

3.31 for 18" rims and 32" tires
3.55 for 20" rims and 34.5" tires
3.73 for 20" rims and 37" tires

You'll definitely notice the decreased power though when you're towing 15k if you only run the 3.55's on 37's because of all the extra weight from those tires. The truck still has plenty of power to do it even in stock form, I'm not saying you can't at all just saying it will pull better with more gear.

Last edited by Axis2011KR; 07-18-2013 at 01:10 PM.
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Old 07-18-2013, 01:01 PM
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Originally Posted by "Stroker 8" View Post
How much would the MPG's drop going from 3:55's to 3:73's ???
If he's running 37s he's gonna get better fuel mileage with the 3.73s over 3.55s in town and towing, highway probably wont make much of a difference unless he's in a hilly area like I am. Personally when I lift my truck its getting 4.10s and 37s because no matter what its going to drop mileage so if I'm getting crappy mileage I'm gonna make sure I have lots of power
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Old 07-18-2013, 01:11 PM
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Originally Posted by Randy_270 View Post
If he's running 37s he's gonna get better fuel mileage with the 3.73s over 3.55s in town and towing, highway probably wont make much of a difference unless he's in a hilly area like I am. Personally when I lift my truck its getting 4.10s and 37s because no matter what its going to drop mileage so if I'm getting crappy mileage I'm gonna make sure I have lots of power
Yeah the 4.10's would be nice but Ford doesn't offer that OEM ring and pinion anymore only 3.73 and then it jumps to the 4.30's
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Old 07-18-2013, 01:15 PM
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True but Nitro Gear and Axle does make 4.10s for the 11+ Super Duty's. I don't know how well they are made but I'm sure when time comes for me to lift my truck someone will have a review on them.
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Old 07-18-2013, 02:02 PM
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Quote:
Originally Posted by Axis2011KR View Post
We've got a 6th gear now so it's not nearly as bad as it used to be with overdrive. If you want it to drive the same performance wise it's:

3.31 for 18" rims and 32" tires
3.55 for 20" rims and 34.5" tires
3.73 for 20" rims and 37" tires

You'll definitely notice the decreased power though when you're towing 15k if you only run the 3.55's on 37's because of all the extra weight from those tires. The truck still has plenty of power to do it even in stock form, I'm not saying you can't at all just saying it will pull better with more gear.
OK gotcha, thanks for the info.
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