We replaced our prop shaft this season as a maintenance item. Nothing visually wrong with the old prop shaft, it's straight and no apparent cracks in the keys. I don't know what material it is, but the boat has been a bracket boat since it was built, so I'm guessing it's always used a decent quality material. If we were running a 9 second or slower boat, I would have run it.
At any rate, it's 1" diameter, 72 3/4" to the small end of the taper and 74 1/2" overall length. $125 + shipping. PM or Email [email protected]