According to the Novak site:
http://www.novak-adapt.com/knowledge/sm420.htm The casting number would indicate a 64-67 SM420, since it is a 7 digit number starting with 37xxxxx. Apparantly all the trannys prior to 64 only had 6 digit casting numbers.
The following passage was taken from this webpage:
http://members.cox.net/cglabe1/SM420/sm420.html "You can determine the date of manufacture of your sm420 by decoding the casting mark on the top of the drivers side. The code starts with a letter that stands for the month (A-L), followed by two digits for the date and two digits for the year. In the example below, H3061 means August 30, 1961."
I just noticed that your casting number matches my SM420 trannys casting number. I just finished rebuilding my SM420 recently, that is why I am so familiar with the sites I posted above. I have some pics of my tranny being rebuilt, but I need to put some more pics in the album showing the completed tranny. Here are some pics:
http://community.webshots.com/photo/546614518/2646378880052948230tEJbXV Jim
