Alright guys, I'm fixing my messed up lower unit in my '81 35hp Johnson. Gears and clutch dog are stripped. I just bought another lower unit and found out its one off an '84-97 unit. I tore the '84 apart and saw that the gears and clutch dog are different than the ones in my '81. Can I still use the '84 gears and clutch dog? What's the difference between the two? The housing are exactly the same as well as the other parts I see. Also, my '81 is a long shaft and the '84 is a short. Thanks! I can post some pics if needed.