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:

155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325 335

x 30 35 40 45 50 55 60 65 70 75 80

x 12 13 14 15 16 17 18 19

Rear axle ratio:

Speed (mph):

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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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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:

155 165 175 185 195 205 215 225 235 245 255 265 275 285 295 305 315 325 335

x 30 35 40 45 50 55 60 65 70 75 80

x 12 13 14 15 16 17 18 19

Rear axle ratio:

Speed (mph):

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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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© 1965-1972 Buick GS Showcase & Registry

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