This is actually an electric vehicle speed rpm tire size calculator but outside of having to figure in the trans overdrive ratio to get either the engine rpm or rear end ratio right it is seriously simple to use. Playing with the numbers shows that at 65 in second gear = 1.63 you would be doing 4106 rpm. Looking at this calculator with the 3.23 gear and if you have a 28 inch tall tire you should be showing 1900 rpm at 70 Calculate RPM for Given Speed(MPH), Rear Gear Ratio, and Trans Gear Ratio () The reverse gear in this transmission is 2.9. Ford 9' with a 4.30 gear, 255-55R16 tires Vehicle is a 1937 Chevy truck that most likely weighs about 3000-3200lbs. Looking up the gear ratios of the trans shows The gearing that was used was 3.06 for first gear, 1.63 for second, 1 for third gear, and 0.7 for fourth gear, essentially a 30% overdrive. Engine has a Holley carb, with proper linkage for the trans pressure cable(TV made easy) 700R4 with a 2300rpm stall converter.
700R4 usually works best with around a 3.7 gear. I come up with a 15 tooth gray drive gear and the first time I used a 40 teeth black gear that lasted about 1,500 miles, the second. I have an early (89 ish) 700R4 that has a 28 spline input and as far as I know it came out of a 2WD truck. 700R4, Speedometer Drive Gears in-stock with same-day shipping.
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The 3.23 gears might be part of the issue. I keep breaking the driven gear on my 700R4 speedometer. Shop 700R4, Speedometer Drive Gears and get Free Shipping on orders over 149 at Speedway Motors, the Racing and Rodding Specialists.
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