I stuck the GPS on the dash and took it for a ride. When my speedometer is
reading 60 MPH I'm doing 61.5 according to the GPS. Sooooo....
61.5 @ 3000 RPM w/ 255/65R15 tires w/ 1:1 transmission and 3.92 gears
If I put your tires on my rig now..
My tire diameter (28.05) divided by your tire diameter (32.83) = .854
3000 RPM * .854 = 2562 RPM with your tires on my truck at 61.5 MPH
2562 RPM's / 61.5 MPH = 41.66 RPMs / 1 MPH
41.66 RPM * 70 MPH = 2916 RPM's at 70 MPH
According to this my GPS system should indicate about 72 MPH on your
dashboard when your speedometer says 64 MPH. Have you had your speedometer
checked? Could it be that your mileage is better than you think!
Regards, Mike Klinke
-----Original Message-----
From: Mike Klinke <LSOMike@email.msn.com>
To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
Date: Sunday, October 22, 2000 12:39 PM
Subject: DML: Re: Re; Anybody have any problems w/ 3.90 axle w/ V8 5 spd
>....I can't think of anything else
>that's different between your drivetrain and mine that would affect RPM's
vs
>MPH so unless I'm missing something obvious one or both of our speedometers
>must be off. I think I'll break out the GPS and get an accurate speed
>measurement.
>
>Regards, Mike Klinke
>
>
>-----Original Message-----
>From: Mike Adair <spinlocker@yahoo.com>
>To: dakota-truck@buffnet.net <dakota-truck@buffnet.net>
>Date: Saturday, October 21, 2000 11:40 PM
>Subject: DML: Re; Anybody have any problems w/ 3.90 axle w/ V8 5 spd
>
>>
>>I have a 96 CC 1500 Ram w/ 5.9 auto. Running
>>285/75x16s. I went from a 3.55 open to a 3.92 posi, as
>>the power increase from the supercharger warranted
>>same.
>>
>>What worked super for hot rodding wasn't worth squat
>>for towing. 3000rpm@64mph in direct, 2000@70mph in
>>o/d. .....
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