Ordered a gear vendor, help with deciding gears

DesertRat said

I have the GV unit with 3:73 gears and 28" tires . 2300 rpm@ 70 MPH. I like it, it's like having a 4speed.

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Now that is an awesome example with the particulars you need to know.
@DesertRat , do you know the OD’s final gear ratio?