RPM Calculator

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Popular Transmission Ratios - use for input below
TRANSMISSION 1ST 2ND 3RD 4TH 5TH
GM Muncie (M20) 66-74 2.52 1.88 1.46 1.00 n/a
GM Muncie (M20) 63-65 2.56 1.91 1.48 1.00 n/a
GM Muncie (M21/M22) 2.20 1.64 1.28 1.00 n/a
GM Powerglide 1.76 1.00 n/a n/a n/a
GM Turbo Hydra-Matic 350 2.52 1.52 1.00 n/a n/a
GM Turbo Hydra-Matic 400/4L80E 2.48 1.48 1.00 0.78 n/a
GM Turbo Hydra-Matic 2004R 2.74 1.57 1.00 0.67 n/a
GM Turbo Hydra-Matic 700-R4/4L60E 3.06 1.63 1.00 0.70 n/a
Tremec 3550/TKO 3.27 1.98 1.34 1.00 0.68
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Input - Note: Currently set for my personal trans (TH350) and rear tire combination.
1st gear ratio: 3rd gear ratio: 5th gear ratio:
2nd gear ratio: 4th gear ratio: 6th gear ratio:
Tire: x x
Rear axle ratio: Speed (mph):
1st gear RPM is: 3rd gear RPM is: 5th gear RPM is:
2nd gear RPM is: 4th gear RPM is: 6th gear RPM is:
Input - Second set for comparison using 700R4 specs
1st gear ratio: 3rd gear ratio: 5th gear ratio:
2nd gear ratio: 4th gear ratio: 6th gear ratio:
Tire: x x
Rear axle ratio: Speed (mph):
1st gear RPM is: 3rd gear RPM is: 5th gear RPM is:
2nd gear RPM is: 4th gear RPM is: 6th gear RPM is:

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