Posted by Vaughn [172.68.141.253] on Tuesday, May 19, 2020 at 19:48:37 :
C-571390 guide pin is used on the early, and late spur gears, and early NP420 trans used on the early M37. All the times I've searched for parts on Ebay, I've only seen the part one time, so it is extremely rare. Well, I've found a pin the same size as the guide pin, see image at link. The new pin is made from M2 Tool Steel, hardened to Rockwell 60, so it has excellent wear capabilities. The original pin is hard also, and I have no information on it. The next step now is to figure out how to mount it in the housing, plenty of length to work with.
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