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Click on image for the lowdown. 
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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Here's the formula; RPM = (MPH x Gear Ratio x 336) divided by Tire Diameter.
So in your case (assuming a .70:1 fifth gear) would be 2014.38 rpm at 75 mph.
Bill Burmeister
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