Jarrid Gross (Yorba Linda, CA) wrote:
> ----------
> Steve Sage writes of 5 speed glamour.
>
> > Plus, 70-75 MPH means 4500-4800++ RPM and
> >things get very noisy and "buzzy" at that point.
>
> I calculate that if you have a 3.89 rear (as you should) you should
> only be turning 4250 RPM at 75 MPH.
> (based upon 3400 RPM (at) 60 mph).
>
> Looks to me that your tach is out of whack, or you have a 4.22/4.55
> rear end in your car.
>
> BTW,
> Put in the Alpine GT 3.70 rear, and that drops to 4040 RPM at 75.
>
> Jarrid Gross