33's or 37's

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Jan 19, 2006 | 02:01 PM

countryF150

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From: mankato, MN

33's or 37's

I know it could go in the tire forum, but no one knows better than the 73-79 crew. I was wondering if going from 33's to 37's will drop my gas mileage enough so i should hang on to my 33's and rims and get new rims and 37's. I go home 3 times a year (150 one way). How much will the 37's drop it. Its a 79' f250, 8" lift, 4x4. I only get7 now. Is it worth hangin onto em or should i sell em. How much will it drop.
country

Jan 19, 2006 | 02:09 PM

amish77

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From: Seneca, SC

if all you're gettin' is 7, I wouldn't worry abou it. You might drop a mile per gallon or so, but extra air resistence isn't what's limiting your gas mileage IMO.

Jan 19, 2006 | 03:20 PM

Thomasm67

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From: Nebraska

YOur not gonna notice any difference if your only getting 7 so don't worry about it plus those 37's will make your truck look better than those 33's with that much lift.

Jan 19, 2006 | 03:42 PM

78250crewcab4x4

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Joined: Mar 2004

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From: OR

whats your gear ratio? depending what it is and how you drive it might improve your milage

Jan 19, 2006 | 03:48 PM

havi

I'll have the Roast Duck

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From: Northshore, MN

bigger tires without changing gears, will lower your highway rpm

Jan 19, 2006 | 07:40 PM

highboy1975

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Joined: Sep 2003

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From: southwest pa

yea, it would lower your highway rpm and if you have the power to turn em, could actually improve your mileage. thats my thought anyway.

Jan 19, 2006 | 07:54 PM

ncl

Fleet Mechanic

Joined: Oct 2003

Posts: 1,371

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From: Green Springs, OH

This is my setup on my 77 f150 and I get 9-10mpg highway

400 w/4bbl edelbrock and rv cam
c6
np205
4.10 gears
36/12.5/16E TSL Radials

When it had 33/12.50s on it I got around 6-7mpg. Larger tires help a little when you get going out on the highway due to the rpm decrease but lots of city driving they dont due to larger mass to get rolling.

Last edited by ncl; Jan 19, 2006 at 07:58 PM.

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Jan 20, 2006 | 11:54 AM

KubotaOrange76

Its Comin Right for us!

Joined: Feb 2005

Posts: 12,144

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From: GA

i get 10mph highway with my setup in my gallery

5.13's, 472ci. 4 spd, np205 1 tons w/ 44's

Jan 20, 2006 | 05:41 PM

#10

MBBFord

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Joined: Mar 2005

Posts: 8,542

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From: Louisiana

If you had money, a gear change could be a option, but if you have 4.10s already stock, then you should be ok. Go with the 37s, will look better, and I don't even think you'll loose much mpg. Not telling you how to drive, but try taking it alittle easyer on accleration and see how much more mpg you get. Works for me!