1994.5 - 1997 7.3L Power Stroke Diesel  

Going from 4.1 to 3.7 or so. What tires do the trick?

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Old 04-04-2008, 02:47 PM
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Going from 4.1 to 3.7 or so. What tires do the trick?

With stock tire and my gear ratio I get in to very hi RPMs cruising on the freeway.
I don't tow anything more than 6K,
What size tires would bring those revvers down?
Hopefully noting to extreme., just wan't to drop RPM by 200-300.

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Old 04-04-2008, 02:48 PM
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how fast do u drive compared to rpms
 
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Old 04-04-2008, 02:52 PM
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even going from 265/75r16(31in) to 35/12 .5/17 I only dropped maybe 150rpm
 
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Old 04-04-2008, 03:24 PM
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Look here:
Automotive Calculators offer to you by Ford Trucks Enthusiasts | www.ford-trucks.com

Be sure to use the tire diameter...measure it.
It doesn't take much to get the wrong results
 
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Old 04-04-2008, 03:25 PM
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Old 04-05-2008, 10:48 AM
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going from 265/75/16's to 315/75/16's will go from a 4.10 gear ratio to a 3.55 gear ratio. it should have dropped fuelman more than 150 rpms. it dropped mine a bit more than that. fuelman, did you reprogram your ic after the swap?
 




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