Gears rartio Vs Tire size - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 07-20-2009, 12:38 PM Thread Starter
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Gears rartio Vs Tire size

gettin ready to change gears when i install my new tranny. i want to know what ratio will take me back to stock with 38 in tires and still give me good gas mileage. and if i decide to ever up grade to 40in tires what would be best there. i am debating between 4:10 and 4:56. can anyone give their input.








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post #2 of 7 Old 07-20-2009, 01:05 PM
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try searching on google for a calculator. it should be able to give you that information

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post #3 of 7 Old 07-20-2009, 01:07 PM
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probably 4:56 im right at 2000 rpms at 65 mph with 38s
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post #4 of 7 Old 07-20-2009, 01:14 PM
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I would say 4.56s as long as you youre just driving, if you tow alot I would go with 4.88s. But you probally dont tow much with 38s and thinking about getting 40s.

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post #5 of 7 Old 07-20-2009, 01:18 PM
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RANDYS RING AND PINION HAS A CALCULATOR

'99.5 F-250 SD PSD CCLB 4X4
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Your gunna have to climb over a smokin pile of brass to get my guns!!
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post #6 of 7 Old 07-20-2009, 06:36 PM
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had 4.88's with 38's (gas motor) and it was just about perfect, but this is diesel power hole other animal. they hav alot more torque, and can make up for the diff. just depends what ur doin, lookin cool or launchin hard off the stop light.
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post #7 of 7 Old 07-20-2009, 06:42 PM
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don't go smaller than the 4.56. I have that set up with 37's and it is just right. I do tow a lot so if you don't, do the 4.56's, if you do tow do the 4.88's for sure.

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