What Gear's to use? - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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post #1 of 29 Old 07-30-2008, 09:20 AM Thread Starter
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What Gear's to use?

I am putting a 12" lift with 40" tires. I need to find out what gears should i get to put the ratio back to stock......thanks


09 Harley Davidson F-250
4" straight pipe
AFE Stage 2 intake
Spartan 300
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post #2 of 29 Old 07-30-2008, 09:23 AM
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I got 10 inches of lift with 22's on 40's and I went with 4.56's which put it back stock and helped the mpg some also

Looking for 05-07 front end with Harley Lights
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post #3 of 29 Old 07-30-2008, 09:23 AM
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post #4 of 29 Old 07-30-2008, 09:25 AM
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I'd say maybe 4:56?

06 f250 red (If you aint first you last) RICKY BOBBY
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post #5 of 29 Old 07-30-2008, 09:26 AM
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thats what i had on 38.5 and lots of power

06 f250 red (If you aint first you last) RICKY BOBBY
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post #6 of 29 Old 07-30-2008, 10:26 AM
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4.88 for 40's.

'04.5 F-350 CC SB XLT SPORT FX4, DR 8" Lift, 18"x10" Weld Cheyennes, 38"x15.5" Toyo M/Ts, etc.

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post #7 of 29 Old 07-30-2008, 10:33 AM
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I had 4.56's when I ran 40's in one of my other trucks and it seemed like a good ration to me.
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post #8 of 29 Old 07-30-2008, 10:49 AM
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This is such a loaded question....

First off, you need to take into consideration on the extra rolling mass(larger tires &wheels),....the charts don't figure that stuff in.

second,...
do you drive highway mostly?....
do you offroad alot?....
are you changing it to get better mileage?
are you trying not to work the tranny as hard?
do you tow often?
do you like to race?

it's difficult to answer gear questions,...because another big factor has to be taken into consideration is,...preference,...everyone prefers something different.

I have 41's and 4.56's....but I also have a manual tranny...which also has to be taken into consideration...lol
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post #9 of 29 Old 07-30-2008, 01:17 PM Thread Starter
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Quote:
Originally Posted by TANK'S 250 View Post
This is such a loaded question....

First off, you need to take into consideration on the extra rolling mass(larger tires &wheels),....the charts don't figure that stuff in.

second,...
do you drive highway mostly?.... I drive on the Highway alot yes......
do you offroad alot?.... Yes,I drive off road to work on my land but not for fun.
are you changing it to get better mileage? No but that would be nice
are you trying not to work the tranny as hard? Yes, that would be a plus
do you tow often? Not really, but about 3 time a month.....
do you like to race? Who doesn't, lol

it's difficult to answer gear questions,...because another big factor has to be taken into consideration is,...preference,...everyone prefers something different.

I have 41's and 4.56's....but I also have a manual tranny...which also has to be taken into consideration...lol
The guys at the shop were im doing my lift recommended only going with 4.10's ???? I am thinking 4.56's or 4.88's...... both should be close to the stock ratio i would think but im not an expert so??? Thanks for all the input everyone keep it coming... please


09 Harley Davidson F-250
4" straight pipe
AFE Stage 2 intake
Spartan 300
Lead foot
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post #10 of 29 Old 07-30-2008, 01:29 PM
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Quote:
Originally Posted by Strokin' & Smokin' View Post
The guys at the shop were im doing my lift recommended only going with 4.10's ???? I am thinking 4.56's or 4.88's...... both should be close to the stock ratio i would think but im not an expert so??? Thanks for all the input everyone keep it coming... please
i think you should take it to another shop... if those idiots really think 4.10's will be enough for 40" tires they obviously know nothing about gears....
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