Hi,

I recently acquired a 1966 Nova SS that originally comes with a Muncie 4 speed. My question is, how do I determine weather it comes with the M20 or the M21. Any help would be great.

Thanks

You can try this site, he might be able to tell you more, but the cowl tag list the trans as a 4 speed, doesn't say which one.
http://www.novaresource.org/c66.htm
Hope this helps. :smokin: