Reply To: 1958 Johnson Gearcase

[Don]

Good question indeed. I’m pretty sure this can be done, but you will have to investigate further. I think this will work out because the shock absorber driveshaft used a larger diameter lower gear housing bushing, that is the same diameter as the driveshaft on the 10hp….
But, you will need the 10hp driveshaft, upper bushing/seal, and prop shaft, along with the 10hp shift rod. You will need to remove the original shift rod detent spring because the 10hp shift rod does not have the detent reliefs in its shift rod.
Let me know what you discover, have always wondered about this….