Gear ratio and tire size - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 12-31-2012, 12:40 PM Thread Starter
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Gear ratio and tire size

Who is running 37" with a stock 3.73 gear? What kind of RPM's are you seeing? I am debating to remove my 4.30 and go back to 3.73's since i have to rebuild my front diff since it grenaded the bearings last week.
Opinions please.

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post #2 of 7 (permalink) Old 12-31-2012, 12:45 PM
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Re: Gear ratio and tire size

I ran 37's and 3.73's back in the day. And really it boils down to what you use the truck for. If you do more highway go with the 3.73 or 4.10. If you tow a lot or do more stock and go in town driving keep the 4.30's.

The amount of power you are making can play a pretty big role as well as what tire/wheel set up you have. Some combos are just plain HEAVY.

Any rpm calc can give you specific answers.

Example: the truck in my avatar runs 5.38's with 46's. But there is also over 1200lbs of tire/wheel/adapters bolted to the hubs.
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post #3 of 7 (permalink) Old 12-31-2012, 08:07 PM Thread Starter
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Re: Gear ratio and tire size

Thanks for the reply. I know the gear calc will give me a # but what i was really looking for was real world feedback. Sometimes the answer in black and white does not work in the real world.

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post #4 of 7 (permalink) Old 01-02-2013, 03:38 PM
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Re: Gear ratio and tire size

i think joe ran that combo for a bit but may have dropped back to 35's.

not sure where the mpg point would be , you will be using more pedal to get up to speed with the 3.73 but cruising would be gains..since i only run 285s i thought about droping to say a 3.55 since 90% of my driving is open hwy light loads. with an occasional 12+k trailer.

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post #5 of 7 (permalink) Old 01-02-2013, 03:54 PM
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Re: Gear ratio and tire size

It can also effected the transmission, I assume its an auto, if you run that tire size and a high(er) gearing you put excess wear on the transmission, because you will be down shifting every incline you hit, I have seen it cause transmission failure in as little as 50,000 miles, just my 2 cents however if it is a manual, then it is your chose based on your driving.

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post #6 of 7 (permalink) Old 01-02-2013, 05:22 PM
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Re: Gear ratio and tire size

Quote:
Originally Posted by ltracer06 View Post
however if it is a manual, then it is your chose based on your driving.
That is why I love a manual...

41" tires, 4.56 gears

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post #7 of 7 (permalink) Old 01-03-2013, 02:59 AM
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Re: Gear ratio and tire size

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Originally Posted by TANK'S 250 View Post

You are not far off of what I see with my truck. Avg 12-13 MPG.
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