Can anyone tell me the gear ratio in 4th gear on a '72 M-21 transmission? Trying to figure out half shaft and wheel rpm's. Thanks.
Gear ratio
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Re: Gear ratio
The GM Archives Vehicle Information Kit for 1972 (page 129 of 163) shows M21 ratios of:
First: 2.20, Second: 1.64, Third: 1.27, Fourth: 1.00, Reverse: 2.26.
Information fits are available for free download at:
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Click on the link then scroll down the page to "Corvette" and click on "Show". Select (click) the year you want to download, "1972" in this case and accept approval of the GM Usage Agreement. The pdf will then download. In your case, "1972", the info is on page 129 (Multiplication Factors are on page 117).Judging Chairman Mid-Way USA (Kansas) Chapter- Top
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