m22 how to tell from m21?

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**Steve Shauger** · #1 04-09-2008, 05:25 AM

M22 transmissions built late Oct of 1968 had a C designation following the build date. Those transmission built prior did not have that identifier so the easiest way would be to look at the input shaft. M22's had no grooves on the input shaft. M21's had one groove on the input shaft and M20's had two grooves. Fine spline was used in later years and was not a transmission type identifier.

**427king** · #2 04-09-2008, 05:30 AM

[ QUOTE ]
M22 transmissions built late Oct of 1969 had a C designation following the build date. Those transmission built prior did not have that identifier

[/ QUOTE ] Steve, M22s used the C in 1968 date production[69 model year]

**Steve Shauger** · #3 04-09-2008, 05:34 AM

[ QUOTE ]
[ QUOTE ]
M22 transmissions built late Oct of 1969 had a C designation following the build date. Those transmission built prior did not have that identifier

[/ QUOTE ] Steve, M22s used the C in 1968 date production[69 model year]

[/ QUOTE ]

I meant 1969 production. The identifier was implemented Oct 21st of 1968 for 1969 production. Is that better

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