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Muncie M20, M21, M22 differences?

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Old Nov 11, 2003 | 05:53 PM
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Default Muncie M20, M21, M22 differences?

Can anyone tell me the differences between these transmissions? Thanks!
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Old Nov 11, 2003 | 06:34 PM
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Default Re: Muncie M20, M21, M22 differences? (The_Dude)

m20=wide ratio=2.52
M21=close ratio-2.21
m22=same ratio as m21, but heay duty gears, l88 trany, lt1 tranny
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Old Nov 11, 2003 | 06:38 PM
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Default Re: Muncie M20, M21, M22 differences? (GDaina)

The easiest way to distinguish them is kooking at the input shafts, the wide ratio m21 has 2 grooves, the close ratio m21 one and the m22 none
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Old Nov 11, 2003 | 06:43 PM
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Default Re: Muncie M20, M21, M22 differences? (Twin_Turbo)

Go to http://www.5speeds.com and follow the menu to muncie 4 speeds.
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Old Nov 11, 2003 | 07:46 PM
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Default Re: Muncie M20, M21, M22 differences? (Twin_Turbo)

TT,
In the old days some of the aftermarket gear manufacturers did not cut the groove in the input shaft, so not every NO GROOVE trans is a M-22.
...redvetracr
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Old Nov 11, 2003 | 07:51 PM
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Default Re: Muncie M20, M21, M22 differences? (redvetracr)

I bought one of the older Muncies myself that was grooveless. There were many aftermarket suppliers that created this confusion to the groove rule. Fine transmission....a classic.

:chevy :thumbs:
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Old Nov 11, 2003 | 08:55 PM
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Default Re: Muncie M20, M21, M22 differences? (mengbar)

pretty good articles here:
http://www.corvettemagazine.com/1999...1/munciep1.asp


http://www.corvettemagazine.com/1999...2/munciep1.asp

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Old Nov 11, 2003 | 09:32 PM
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Default Re: Muncie M20, M21, M22 differences? (The_Dude)

I bought a '69 Nova with a 396 and a Muncie "M22" that turned out to really be an M20 in need of a rebuild :rolleyes:. I was just wondering what the differences were. Thanks for all the links.
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Old Nov 11, 2003 | 11:32 PM
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Default Re: Muncie M20, M21, M22 differences? (The_Dude)

Yep, there are thousands more M22's out there than were actually ever produced according to misinformed or misinforming car owners.
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Old Nov 11, 2003 | 11:41 PM
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Default Re: Muncie M20, M21, M22 differences? (The_Dude)

I like the M-20 for the antique part that it is. I like the lower first gear than the 21 or 22. I have PUNISHED mine with nitrous and slicks and I'll have to admit it has held up nicely. Other than the bearings and synchros all of the original 'hard parts' are still there. Some are worn out now after 30 years of service, but are not broken.
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Old Nov 12, 2003 | 01:06 AM
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Default Re: Muncie M20, M21, M22 differences? (The_Dude)

I bought a '69 Nova with a 396 and a Muncie "M22" that turned out to really be an M20 in need of a rebuild :rolleyes:. I was just wondering what the differences were. Thanks for all the links.
ahhhh!! Now I understand; When my M20 starts making loud whirring and grinding noises I can just tell people it's an M22 "ROCKCRUSHER" !! :) MJ
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Old Nov 12, 2003 | 11:21 AM
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Default Re: Muncie M20, M21, M22 differences? (MNJack)

ahhhh!! Now I understand; When my M20 starts making loud whirring and grinding noises I can just tell people it's an M22 "ROCKCRUSHER" !! :) MJ
:lolg: :rofl:
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Old Nov 12, 2003 | 11:29 AM
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Default Re: Muncie M20, M21, M22 differences? (mengbar)

Muncie...not a bad trans. I like it better than the newer "gazillion-speeds" that are floating around. But Ford and Chrysler had superior 4-speeds in those days. Ford's toploader was unbelieveably strong!

Dep
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Old Nov 13, 2003 | 05:25 AM
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Default Re: Muncie M20, M21, M22 differences? (MNJack)

I bought a '69 Nova with a 396 and a Muncie "M22" that turned out to really be an M20 in need of a rebuild :rolleyes:. I was just wondering what the differences were. Thanks for all the links.

ahhhh!! Now I understand; When my M20 starts making loud whirring and grinding noises I can just tell people it's an M22 "ROCKCRUSHER" !! :) MJ
you can easily convert your M21 or M20 to an M22 by simply adding a tbsp of Al-O2 powder to the gear oil. :lol:
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