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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: Nov 2002 Posts: 1,002 Shop Shark | | Shop Shark Joined: Nov 2002 Posts: 1,002 | There are RPM calculators on the web that will tell you what your rpm is for a given rear axle ratio and tire size. Here's one there are others; http://www.csgnetwork.com/multirpmcalc.htmlI went from 4.56 to 3.73 in my 68 C20 with 327. I wanted to be under 2500 rpm at 65 mph, and 3.73 doesn't do it. A 3.55 would just get me there, 3.30 would be better. My tire size is 265/75 16. Hope that helps. Larry
I don't own a vehicle that isn't old enough to drink.
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