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jqs, The only splines in the driveline is the trans input shaft to dampener plate of the flywheel. Since this guy simply looked at the boat, the only thing he may think are splines is the cutlass bearing in the strut. (it sort of looks like it's a spline because it's grooved) If he is in fact calling this bearing a spline, he doesn't know what he's talking about or must be smoking something. Don't worry about him!
BTW, I've seen cutlass bearings last thousands of hours and some last less than 5 after a boat hit something bending the shaft and or strut throwing the alignment out.
BTW, I've seen cutlass bearings last thousands of hours and some last less than 5 after a boat hit something bending the shaft and or strut throwing the alignment out.