Here are some pictures of an SM420 rebuild that I just finished up for my
‘50, 3600. Best advice I could give you is to get a GM manual for the
trans and study it before and during your rebuild.
http://www.pbase.com/dennygraham/sm420_rebuild&page=all There used to be a complete manual on TCOMP but I’ve been looking for an
hour and can’t find a trace of it.
Denny Graham
Sandwich, IL
