So here’s my dilemma, the Chevrolet booklet that supplements the film strip for the Four-Speed Synchro-Mesh (SM420) Transmission Overhaul, gives this instruction on page 8:
http://www.pbase.com/dennygraham/image/137384964/large The “spacer” in this transmission is a special cup shaped freeze plug with an OD of 2 7/16” which doesn‘t match anything that I can find under 4.426 in any of the parts books.
Here are a couple of actual pictures of the SM420 out of my 1950, 3600. This is the original transmission that it came from the factory with and I got that from one who was there when it was new and helped maintain it over the years.
http://www.pbase.com/dennygraham/image/137384971/large http://www.pbase.com/dennygraham/image/137384973/original Now punching a hole in it and prying it out was all fine and dandy back in 1950 when the mechanic could walk across the center isle to the parts department and have Andy Anderson that parts man pull a new one out of the parts bin.
But Old DG taint got that luxury and it’s really dragged me down to a halt on this project. The kit I got from Novak, which I thought was supposed to be complete, does not have one of these in it, in fact unlike the Chevrolet booklet and film strip, they don’t even make mention of it in their disassembly/assembly instructions for the SM420 kit.
http://www.pbase.com/dennygraham/image/137384975/large Anyone run into this during your SM420 rebuild?
Denny Graham
Sandwich, IL
