4.30 gears and and 37" tires - Ford Powerstroke Diesel Forum
6.0L Performance Parts Discussion What has or has not worked for you?

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Old 04-12-2009, 03:10 PM
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4.30 gears and and 37" tires

Does any one run 37" tires and 4.30 gears? What kind of mpg do you get? How does it tow? What rpm do you run at 70 mph?
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Old 04-12-2009, 07:26 PM
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I'm pretty close with 4.10's and 36.6. My mileage has hardly changed...still get about 16 hwy and around 12 towing. No complaints in the towing department. Running about 1800 rpms at 70mph...with the 4.30's it'd be about 1900rpm.
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Old 04-12-2009, 07:31 PM
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i have them.. at 70mph im usually around 2100

towing is good and bottom end torque increased... im only getting around 14mpg but your 6.0L will prob get a lil better than my truck
-Raul
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Old 04-12-2009, 08:16 PM
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I am running 4.88 with my 38's and just bought some 40's with 18" rims......so I am hoping I gain some on the freeway.......
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