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Re: another gear ratio question with a bbc
This link is off an EV site but is the simplest Speed, rpm, gear ratio, tire size calculator that I have found. http://advanced-ev.com/Calculators/TireSize/
It is figured at 1 to 1 at the output shaft so you have to factor in any overdrive in the final gear ratio meaning if you have an 80% over drive and are running 4.11 gears you multiply the 4.11 by .80 to get 3.288 or 3.29 or 30 for your final gear ratio.
You put in any three factors and get the fourth so that helps a lot. It's great for the "what will a tire size change do to my RPM at 70 kinds of questions.
This one will just give you the rpm after you put in the other factors.
https://purperformance.com/p-29669-rpm-calculator.html Great if you just want to know what rpm will change when you do other changes though.
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Founding member of the too many projects, too little time and money club.
My ongoing truck projects:
48 Chev 3100 that will run a 292 Six.
71 GMC 2500 that is getting a Cad 500 transplant.
77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.
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