Anyone Running 37s with 3:55 Gears? - Ford Powerstroke Diesel Forum

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post #1 of 10 Old 11-16-2010, 08:01 AM Thread Starter
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Anyone Running 37s with 3:55 Gears?

(Sorry about the misstype on the title.) Anyone here running 37s with 3:55 gears? If yes, what's your experience? Lose a couple of MPGs I'm sure.

What about driving up hills on the highway - does the truck constantly downshift?

Also, what about braking. Did you lose a lot of stopping distance?

Thanks in advance!


Last edited by 1stgear; 11-16-2010 at 08:07 AM.
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post #2 of 10 Old 11-16-2010, 08:22 AM
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Originally Posted by 1stgear View Post
(Sorry about the misstype on the title.) Anyone here running 37s with 3:55 gears? If yes, what's your experience? Lose a couple of MPGs I'm sure.

What about driving up hills on the highway - does the truck constantly downshift?

Also, what about braking. Did you lose a lot of stopping distance?

Thanks in advance!
Fixed it for ya bud .................it really depends on how/where you drive your truck.........if you do alot of city driving then yes you will notice a decrease in MPG, as to how much, again depends on your right foot cuz the engine does have to work harder to turn those 37's. If you do alot of highway driving your actually getting more distance per revolution because your tires are bigger, so your MPG could go up if its not too hilly. With the truck being a turbo downshifting shouldn't really be an issue as the turbo boost will make up for the power needed but again this will bring down your MPG

Gears really don't affect your stopping distance, but as for the tires, yes they will, remember your adding a bunch for rolling mass with 37's, its just simple physics.......but its nothing the truck can't handle

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post #3 of 10 Old 11-16-2010, 08:25 AM Thread Starter
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Thanks, Julian. I appreciate you fixing the title and giving me a little push to get the tires. Sounds like I'll be okay running them.

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post #4 of 10 Old 11-16-2010, 08:48 AM
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Thanks, Julian. I appreciate you fixing the title and giving me a little push to get the tires. Sounds like I'll be okay running them.
No problem

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post #5 of 10 Old 11-16-2010, 09:00 AM
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Rookie/Newb question, but uh how do you know what gears you have?



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post #6 of 10 Old 11-16-2010, 09:02 AM
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Originally Posted by CDUBYA View Post
Rookie/Newb question, but uh how do you know what gears you have?
Its on the window sticker or you can check by using your VIN

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post #7 of 10 Old 11-16-2010, 09:05 AM
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sweetness thanks.



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post #8 of 10 Old 11-16-2010, 09:07 AM
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I have 35s (used to have 37) and I was reading 27 mpg at 70 mph on the 30 mile drive to work this morning (with the black maxx set to the hottest tune) The meter is within 1 mpg accurate.

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post #9 of 10 Old 11-16-2010, 08:24 PM
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Originally Posted by 1stgear View Post
Thanks, Julian. I appreciate you fixing the title and giving me a little push to get the tires. Sounds like I'll be okay running them.
There is still a typo in the title. Not "3:55" but "3.55:1".

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post #10 of 10 Old 11-16-2010, 09:12 PM
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Originally Posted by CDUBYA View Post
Rookie/Newb question, but uh how do you know what gears you have?
The easiest way is to check the original window sticker listing the vehicle's options and price. Edit the following URL inserting your VIN in place of mine: Untitled Page...

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