I am rebuilding a 67 Sm420 transmission. I downloaded the overhaul manual that "54 3600" had posted. The manual is for older SM420's & does not mention the problem I have. On the inside opening of the 1st speed sliding gear there are 2 metal snap rings that snap into 2 separate grooves. Inside the bottom of each groove is a rubber strip. I'm guessing these are for applying tension between the gear & main shaft. Also the rings are wavy not flat & have 2 teeth opposite the ring opening. This gear did move on the main shaft before it was disassembled but it was pretty tight. I'm having trouble getting the gear back on the counter shaft. My questions are, what are these for, do the rubber strips belong in the grooves , is there a certain orientation for these rings to be installed & is there a trick to getting the gear onto the main shaft? Here's a
video that I hope helps make sense of all of this . Thanks Mark
