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Re: Rpm question
If the tach is accurate, it's the gear ratio and tire diameter that's making it run higher RPMs. A factory 4spd is likely to have 4.10s. I doubt it's 4.56 but even could be, but that's rare. I think 3.73s would run lower than what you have. Your tires aren't crazy short, so I think you have 4.10s. I have 4.10s with 32" tall tires (4wd) and I'm probably at around 2500 @ 60mph. I run right about 2800 @ 65. 3.07 gears would bring that RPM down considerably.
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Tim
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