I have mine apart now for second gear issue. I found the shaft is worn in the thrust washer reccess. I just orderd parts $550 cnd. That is both gears, shaft, washers, gskts, and misc. I am a heavy duty mechanic but I did this at home with my "at home tools". About 5 hours to get the engine out and and hour to tear it down. I have great pics of the worn parts. I hope this helps.
Scotty