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The 5-bolt case with the pinion running in the bushing instead of the drive shaft also puts the bearing support in both axial and lateral directions right at the load. The pinion in the 4-bolt case is it supported by a thrust bearing at the load. The drive shaft bushing is separated from the load slightly by the mechanical joint (keyed or splined shaft connection) which also wears once the bushing starts to wear. The fact that the drive shaft provides all the lateral support in the 4-bolt gearcase is the reason for the ridiculously oversize drive shaft diameter in the 58 – 63 10hp. That is why the 10hp has a larger diameter drive shaft than the 18s.
-Ben
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