Re: 4.30's or 4.10
You can use 4th and 5th around town without lugging the motor when you have 4.30s, so cruise rpm is still very low.
Also, you're unlikely to see any change at all in your in-town gas mileage with the gear swap. I didn't.
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-Charles
2003 F-350 6.0 Powerstroke
1984 Mustang LX 408
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