I believe your transmission is the GKT-134. I pulled mine apart last winter and I don't remember anything too complicated about it. There may be a bolt or tab on the front of the transmission that has to come out before that shaft can be tapped out. I remember having to remove a bunch of crud from mine. I don't remember having to search for that bolt or tab.
Wish I could be of more help. I searched for some pictures but I guess I didn't take any.
