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Old 04-06-2005, 05:37 PM
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Identify M-22 4-speed

I need some help. Can anyone tell me how to identify a M22 from the M20 and 21? Numbers or whatever. I'm going to look at one and would like to be sure what it is. thanks
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Old 04-06-2005, 07:24 PM
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Try this link, it has some great information. Identifying a Muncie M22 today is a challenge, as there are a host of offshore replacement parts. One can actually build an M22 from aftermarket parts. Good luck with your endeavor.

Vince

http://www.5speeds.com/muncie2.htm
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Old 04-07-2005, 06:02 AM
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m22

The site Vince posted is a excellent place to gain the info you need about the M-22's ...The info there is about as close as you will ever get so don't let someone talk you out of believing it.

A few quick points... Not all fine (26) spline input muncies are M-22 this is the single most mis-understood fact about the muncie transmissions!!!!!! They did make M-22's in the 10 spline input's but in my 20 years of rebuilding these transmissions i have only seen like 2 or 3 of them....kind of rare..

Pay attention to all the numbers posted on that site, print them out and take them along with you... Don't be suprised if you give the guy selling it a lesson and he might even get mad at you because he was told a un-truth about the box.......

The other problem the site does not address is the fact that these trans were made over 40 years ago and there can be so much mixing and matching of parts it can make you head spinn.... Years ago i used to take the older 7/8' pin cases and bore them out to used the 1.0" pin clusters... I stopped because people would come with there books full of numbers and tell me it's not the trans i am telling them it is.... i would try to explain that i used a older case and machined it to accept the better parts and always got the "deer in the headlights look" So i just quit doing it...

What i am trying to get at is the case numbers might be something different then what the actual gear set is, So be careful..

Pull the side cover off, ( needs to be in second gear to put back on) Look at all the sincros, push them towards the gears they are mounted on. If they get closer then 1/16" then they are on there way out If they touch the gear where the small teeth are they are cracked or just shot...Compair the gear set to the ones Paul has pictured on his site and look close at the gear angle to see if it matches the M-22 picture. This is really hard if you have no previous skills with this trans!!!!!! look at the pin (measures 7/8" or 1.0" ) on the bottom of the case facing the bell housing, front of the trans...... It should be about 1/16 below the face of the trans where it mounts to the bell. If it is flush or sticking out the case is shot and will need repaired... I would recommend staying away from the 7/8" pin transmissions unless they have been updated with the later sincros, or if you don't plan on "YANKING GEARS"

Do you know what the asking price is???? Did the seller give any idea what the trans is out of???
If you need to i might be able to make some typ of gauge to send to you with both gear angles so you can know for sure....

Keith
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Old 04-07-2005, 08:06 AM
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Excellent information Keith. I think there are more M22's on Ebay than GM actually produced

Vince
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Old 04-07-2005, 08:19 AM
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Yup

I hear ya.....

Keith
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Old 04-07-2005, 07:55 PM
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Thanks Guys... now if I can just find the phone number I lost!
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