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Old 04-22-2021, 11:31 AM   #2
geezer#99
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Join Date: Aug 2009
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Re: rear diff change

If you’re thinking less rpm equals better mpg, it’s likely not true in your set up.
For best mpg you’re likely turning about 300 rpm lower than optimum. Assuming 28 inch tall tire you’re near 2200 rpm at 70mph. 2500 rpm is likely where your motors sweet spot is.
Going to a 4.10 gear would be better.
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