Have you tried this calculator?
http://www.311s.org/gear_ratio_rpm.xls
----- Original Message -----
From: "Mike H." <twobeaners@earthlink.net>
To: "Datsun Roadster List" <datsun-roadsters@autox.team.net>
Sent: Friday, July 20, 2007 4:13 PM
Subject: Cool Gear Ratio Calculator
> Sorry, I was so excited to send this link, I forgot the link, Doh!
> This is a useful gear ratio calculator that I know some of you probably
> already have. I used this and the tire calculator from Gordon's site, to
> see
> if the 19 tooth pinion I put in the rebuilt 5-speed was accurate with the
> stock 3.9 rear end in my '67 stroker. It is right on the money, with all
> gears
> at 2000, 2500, 3000 rpm. I couldn't believe the speedo or the calculator
> was
> that accurate!
>
> http://www.torinocobra.com/gearratio.xls
>
> Enjoy,
> Mike Hudson '67 - R20 / 5-Speed
!
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