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Post Info TOPIC: M20 or M21


A Poncho Legend!

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M20 or M21


Small world story wink   

In 1971 I bought a Ventura II  307 speed...  Friend  John, here in Clinton, owned a rusty 66 L79 Chevy II   I bought the M20 out of it, for 200.00 biggrin 

John sold the 66 L 79 shell to Friend Doug  (in about 1971-2)....

40 years later...  John is restoring a 66 L79 Acadian biggrin  and Doug still has 66 L79 Chevy II hardtop (just went to Clinton Auto Body for restoration)   

Doug owns the building I store 2 vehicles in...  

Today I see Doug in Post office, and ask if he has a trans for his car?   answer NO  

I ask him if he wants to trade my 1969 M20 for some storage fees..(like a whole year)  

He says he will think about it  

Steve Johns (guru) tells him he needs a M21 ??     tonight the light came on !  I bought the original trans and it was in my 307 car and was a M20

 

Why would a restorer tell him to get a M21 for a 3:36 rear car ??    

 

just wondering     Carl



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Guru

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A well know tranny builder in the Okanagan told me an M20 with the larger 1" output shaft was the ideal tranny for rear end gearing between 3:36 to 3:73. Anything beyond that M21

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"you can't burn out, if your not on fire" -Jim Morrison


Poncho Master!

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Hi Carl, it should be an M20 for a '66 Acadian.

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A Poncho Legend!

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Excellent     a years storage paid for will be sweet    



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MC


Canadian Poncho Superstar!

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Wow... that's quite a game of musical chairs there, Carl!  biggrin

Best of luck with your free storage deal!



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Canadian Poncho Superstar!

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now that is a cool story !



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later...rog

AADD supporting member !!
I'm a collector...not a builder!!Located in sunny central Saskatchewan at the lakehead!


Guru

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Some people automatically assume the close ratio M21's are somehow better. They work fine with 4.11's or 4.56's but as Carl mentioned, an M21 is not a good transmission for a car with 3.36 gears. The high first gear coupled with a high rear end gear would make the car very sluggish off the line.



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Barrie Ont.

409 powered 61 Poncho

best time 9.06@ 148 



Poncho Master!

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M21 is NO good with 3:08's changing to 3:73

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A Poncho Legend!

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I ran an M21 in my 66 327 Nova with 3.73 and as stated, that was fine.

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1966 Strato Chief 2 door, 427 4 speed, 44,000 original miles "FAKE_66"

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