Where are the letters

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May 22, 2017 | 04:53 PM

67Rocket

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Joined: May 2015

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From: Southern Virginia

Where are the letters

According to my CSM, M 20 trans. have the letters HP and M22 have the letters HF stamped on the side of the case, where are these letters located? Thanks

May 22, 2017 | 07:21 PM

68442

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Joined: Aug 2010

Posts: 820

Not true, Never heard of that . In 69 they started to put a single letter at the end of the date code(PXXXX) to signify the ratio. A= M20, B= M21 C= M22

May 23, 2017 | 06:10 AM

67Rocket

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Joined: May 2015

Posts: 344

From: Southern Virginia

My CSM is for a 69 year model Cutlass/442/Toro and it says the letters are an inch tall. Whatever, is there any way to externally tell if a Muncie prior to 69 is M20 or M22? Thanks.

May 24, 2017 | 04:34 AM

68442

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Joined: Aug 2010

Posts: 820

The number of Rings On the Input shaft is the only other way prior to 69
63-65 No rings = M20
66-74 Two rings = M20
63-74 One ring =M21
67-74 No rings =M22