3.5L V6 Ecoboost
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Joined: Oct 2006
Posts: 10,191
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From: Texas
Might want to post on the 2017 F150 section; you will likely get answers there a lot faster. Or ask the Mod's to move this thread to the proper place. Good luck.
Lead Driver
Joined: Dec 2013
Posts: 9,762
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Easy answer is that you have to measure the overall diameter of the tires to know the answer. This is true regardless of what vehicle you have.
In the truck's computer, the truck knows the size of the tire and the rear gear ratio. Both should match what you have to be 100% accurate.
In the truck's computer, the truck knows the size of the tire and the rear gear ratio. Both should match what you have to be 100% accurate.
More Turbo
Joined: Jul 2005
Posts: 592
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From: Groton, MA
Cargo Master
Joined: Jul 2009
Posts: 2,710
Likes: 77
From: Central Florida
That shows a pretty small difference in the tires. Assuming those are the tire sizes you are looking at you wouldn't even need to re-calibrate the speedometer or change the gears.
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Lead Driver
Joined: May 2015
Posts: 5,891
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From: Mts. S. of San Francisco
A new F-150 can be had with either of those rims, and 17" as well. The difference is in the tire profile and circumference (or diameter if you prefer). Put the correct tires on, and there is no difference in the end result.
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Joined: Nov 2016
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DLEWIS1624, i saw You say "without changing axle gear ratio". I am new to this and would like to know what i have to do in order to change my truck's axle gear ratio?
Any explanations would be fine to noobie
Richard
Any explanations would be fine to noobie
Richard
Fleet Mechanic
Joined: Sep 2016
Posts: 1,801
Likes: 48
From: Abilene TX.
Have the ring an pinion gear changed in the axle. Both front and rear if it is four wheel drive.
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