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thats what i thought as well but not a chance in hell 1st of all the back of my alpha is square and the piece of crap lower comes to a point drive shaft has a point on the top mine doesnt and my prop wont go onto the drive shaft properly rubs and shaft isnt tapered
My understanding is that gen 1 alpha drives can be swapped with MC-1 drives, but Gen 2 drives cannot. If the lower has the pin in the top of the shaft, it won't fit on the newer upper though.
My understanding is that gen 1 alpha drives can be swapped with MC-1 drives, but Gen 2 drives cannot. If the lower has the pin in the top of the shaft, it won't fit on the newer upper though.
Your original question was "can I replace my lower alpha 1 unit with a MR lower unit" now you say Pre 74, that is not an MR or an Alpha, it's an older 1 drive, and no you can't swap the lower units. You can swap the complete drive on the transom shield, but can't change just lower units.