m22 how to tell from m21? - The Supercar Registry

04-09-2008, 08:04 AM

crash

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Re: m22 how to tell from m21?

The begining of the 1970 model year engineering drawing changed to put a fill and drain plug in every main case...
A lot of customer what drain plugs, so I have drilled and tapped many cases to 1/2" NPT, and I know a lot of rebuilder that do the same...
The only positive way of determining if you have and M-22 is to pull the side cover to see if the gears helical angle is 21* (M-22) or 39* (M-20-21)... Hope this helps... Crash

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