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#1
04-09-2008, 07:29 AM
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Re: m22 how to tell from m21?
any truth to a drain plug being a idenifier? dennis
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#2
04-09-2008, 08:04 AM
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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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#3
04-09-2008, 08:17 AM
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Re: m22 how to tell from m21?
[ QUOTE ]
any truth to a drain plug being a idenifier? dennis [/ QUOTE ] Sort of. M22 did have the drain plug, however many M20/21's had a drain plug retrofitted for ease of gear lube changes. Here's a pic of the gear sets showing the teeth angles: M20/21:  M22:  
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#4
04-09-2008, 09:01 AM
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Re: m22 how to tell from m21?
...note NO overlap of M22 gear teeth on the same gear while M20/21 teeth overlap the next tooth in sequence..
__________________
I don't think it was coincidence that the Great Depression happened during Prohibition... 
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#5
04-09-2008, 07:19 PM
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Re: m22 how to tell from m21?
Helical vs straight cut gears... that's what makes it the "rock crusher"
__________________
~JAG~ NCRS#65120 68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car #21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built. 71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist. NUMEROUS Lemans blue Camaros, Monza Red and Daytona Yellow Corvettes & a Chevelle or two... Survivors, restored cars, & other photos https://picasaweb.google.com/lh/myphotos
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#7
04-10-2008, 03:32 AM
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Re: m22 how to tell from m21?
Maybe the mods could pin this thread to help with any muncie question...
__________________
~JAG~ NCRS#65120 68 GTO HO 4 spd Alpine Blue /Parchment 2 owner car #21783 71 Corvette LT1 45k miles Orig paint - Brandshatch Green - National Top Flight - last known 71 LT1 built. 71 Corvette LT1 42k miles Original paint - Black - black leather - only black LT1 known to exist. NUMEROUS Lemans blue Camaros, Monza Red and Daytona Yellow Corvettes & a Chevelle or two... Survivors, restored cars, & other photos https://picasaweb.google.com/lh/myphotos
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