Hello. Need some help. I am rebuilding a 5 speed trans from a 77 280Z. I want to replace the seal and o-ring on the shift shaft assembly. The shift mechanism is attached to that shaft with a pin riding in an indent in the shaft. How do I remove that pin? I can get the nut off but there is no room to get a tool in there to push that pin out. I found a YouTube video showing an access hole on the side of the tail casing, but I do not have that. Suggestions? This is the last thing to complete rebuild.