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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	0.75	n/a
GM Turbo Hydra-Matic 2004R	2.74	1.57	1.00	0.67	n/a
GM Turbo Hydra-Matic 700R4/4L60E	3.06	1.63	1.00	0.70	n/a
Tremec 3550/TKO	3.27	1.98	1.34	1.00	0.68
Tremec TKX-5	2.87	1.89	1.28	1.00	0.81

Input - Note: Currently set for typical wide ratio M20 and rear tire size of 215x70x14 - Naturally you can substitute any transmission/tire-wheel combination.

1st gear ratio:		3rd gear ratio:		5th gear ratio:
2nd gear ratio:		4th gear ratio:		6th gear ratio:

Tire:

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 - Naturally you can substitute any transmission/tire-wheel combination

1st gear ratio:		3rd gear ratio:		5th gear ratio:
2nd gear ratio:		4th gear ratio:		6th gear ratio:

Tire:

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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