>> I checked with a friend on the difference in RPM between 3.90 and 4.10 and
>> 4.30 and he has a slide rule type thing from his racing days he told me that
>> 3.90 - 4.10 would add 400 RPM and 3.90 - 4.30 would add 825 RPM and 4.56
>> would add 1325 RPM. Doesn't seem right 2100 - 3.55 and 2250 - 3.90 but as I
>> said either tach or speedo could be off a little and throw this off. I will
>> check with him and see what 3.55 - 3.90 should be.. Anyone else out there
>> with V8 2WD Auto with any info on RPM at 70 MPH???
>
>I tried it with my '97 Dakota (4WD, Auto, V8), and I was running 1900
>RPM at 70 MPH. I believe I have the 3.55, and my truck has the Tire and
>Handling package (31x10.5 tires).
>
>-Dave
>
>------------------------------------------------------------------------
>D.J. Hannu dhannu@CENTURYinter.net
>http://www.geocities.com/SoHo/5177
>
Ya'll keep in mind that The tach on Dakota's is not very accurate. Mine for
example reads 200 higher at 4000 than it really is, so its actually 3800.
The higher the tach reading the worse it gets. I found out what it was
exactly the other day during my dyno run.
According to the AG engineering (Where I had it done) most factory tachs are
not very accurate.
Alan...
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