> Allen, here's a formula for finding MPH with your tire diameter and rear
> ratio known......
>
> RPM x Tire Diameter
> ------------------------------ = MPH
> Gear Ratio x 336
>
> Example:
>
> 2000 x 29"
> ---------------------------- = MPH
> 3.55 x 336
>
> 58000
> --------------------------- = MPH
> 1192.8
>
>
> MPH = 48.6 at 2000 RPM or aprox. .0243 MPH per 1 RPM
>
> Hope this helps!
>
> Mike B. '56 8400 Wrecker :)
>
>
> ----- Original Message -----
> From: "Allen Jones" <jonesal@u.washington.edu>
> To: <oletrucks@autox.team.net>
> Cc: "Amy J. Jones" <AJJ@hartcrowser.com>
> Sent: Monday, January 24, 2000 9:37 PM
> Subject: Re: [oletrucks] 3rd Gear Ratio
>
>
> > Thanks for the responses. With a change to 3.55 gears in the rear axle
> and
> > 215R85-16 tires (man, they are tall tires), my speedometer is WAY off.
> I'm
> > making a poor person's speedometer by using my tachometer to tell how
fast
> > I'm going. It's an Excel spreadsheet that calcs a little RPM table
based
> on
> > the gear ratios I have and speeds I want to go (in third and fourth gear
> > only) that I can hide above my visor. I may buy a compensating box for
> the
> > speedometer when the tax return comes back (maybe not). If anyone wants
> the
> > spreadsheet, ping me off list and I'll email it to you. Turns out I'm
> > surprised I didn't get a speeding ticket on the highway 'cause my guess
at
> > my real speed was awful (the 261 really hums along!).
> >
> > Allen in Seattle
> > '50 3100
> >
> > ----- Original Message -----
> > From: Jack Halton <safesix@earthlink.net>
> > To: Allen Jones <jonesal@u.washington.edu>; <oletrucks@autox.team.net>
> > Sent: January 24, 2000 5:48 PM
> > Subject: Re: [oletrucks] 3rd Gear Ratio
> >
> >
> > 1st 7.06
> > 2nd 3.58
> > 3rd 1.71
> > 4th 1.00
> >
> > Jack / Winter Park FL
> > ----- Original Message -----
> > From: "Allen Jones" <jonesal@u.washington.edu>
> > To: <oletrucks@autox.team.net>
> > Sent: Monday, January 24, 2000 5:21 PM
> > Subject: [oletrucks] 3rd Gear Ratio
> >
> >
> > > Folks,
> > >
> > > Does anyone know what the gear ratio is for 3rd gear on a *stock* four
> > speed
> > > trans of a 50ish vintage?
> > >
> > > Thanks!
> > >
> > > Allen in Seattle
> > > '50 3100
> > >
> > > oletrucks is devoted to Chevy and GM trucks built between 1941 and
1959
> > >
> >
> >
> >
> > oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
>
>
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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