My first car was a 1947 willys overland wagon with overdrive. It was really cool; with bean bag chairs in the back...i carried a lot of friends to school and church with that rig. Charged them sometimes...
Every old guy that said they owned one once always ended the conversation with; "it was purty good till I rolled it".
Yes you have to come to a complete stop to put it in first. In fact with mine I had to put it in second and quickly throw it over into first or it would grind.
It is here.
http://www.peachparts.com/shopforum/attachment.php?attachmentid=36057&d=1157636258