Tire size vs. gearing
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Tire size vs. gearing
I'm about to order an 08 and I'm trying to decide if I want to add the 20' tires.
My question is what will be the net effect on my rear axle ratio. This is important to me since I will be using the truck to tow my boat. I was planning to order the 4:10 gears.
My question is what will be the net effect on my rear axle ratio. This is important to me since I will be using the truck to tow my boat. I was planning to order the 4:10 gears.
Hotshot
Joined: Jun 2003
Posts: 12,341
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From: SW VA
Originally Posted by georgedo
I'm buying the 6.4 diesel with the 5 speed auto.
Regarding the tire diameter, what numbers of the tire spec refer to the diameter?
Regarding the tire diameter, what numbers of the tire spec refer to the diameter?
http://www.powerdog.com/tiresize.cgi
If I were you, I would get the lowest available gearing you can get. Towing will be easier on the transmission, the truck won't feel like a dog, and you will even get better mileage because the engine doesnt have to work as hard. I would vote for 4.30's at least...
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
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From: Stephensville WI
When the factory determines towing ratings for a truck, they take tire size into account. You don't have to worry about it. Just make sure the truck you purchase can tow the boat you have and it's all good.
Cargo Master
Joined: Nov 2004
Posts: 2,751
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From: So Oregon
Are you ordering a single rear wheel vehicle or dual rear wheels (dually)? Will it be an F250, F350 or F450? Your choices are limited based on the truck you order, however, if you're sticking with stock wheels and tires it shouldn't be a problem whatever you get. It'll likely tow the boat fine.
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Cargo Master
Joined: Aug 2005
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From: Alberta, Canada
If you have Microsoft XL I can send you a spread sheet I made that calculates different tire sizes vs. axle ratios.
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I'm considering buying a 2003 f250 Lariat CC V10 4x4 with 3.73 gears. I think I'm getting a pretty good deal with 98K miles for $13500 in real good condition. My intention is to tow about a 8-10K lb fith wheel (yet to be found). The truck has got 35" almost brand new tires. This is clearly a suboptimal TV setup but will it be functional? How much difference would swapping out tires to a standard size make? Is it feasible to swap out to a lower axle ratio or is that cost prohibitive.
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Joined: Jun 2006
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From: Brinklow Md
Originally Posted by georgedo
I'm about to order an 08 and I'm trying to decide if I want to add the 20' tires.
My question is what will be the net effect on my rear axle ratio. This is important to me since I will be using the truck to tow my boat. I was planning to order the 4:10 gears.
My question is what will be the net effect on my rear axle ratio. This is important to me since I will be using the truck to tow my boat. I was planning to order the 4:10 gears.
you can also get 4.88 in the rear, but i think that might only be an option on the 450. but they do de-tune the engine so you dont blow your trans but if you know someone who works for ford you can get them to reset it so you ge the full power out of the 6.4
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