[Walt Fricke]

Are we seeing 3d gear on one shaft hitting (and damaging) 2d gear on the other shaft? Because something is out of whack concerning spacing, like too few or many spacers on one or the other of the shafts?

I am a bit baffled as to how a thrust washer itself can fail. Or even be damaged - knicked on its circumference, maye, by debris, but that ought not to affect its function, should it? But surely it can't compress to allow the shaft to shaft alignment of the constant mesh gears to be off.

If the gears on the pinion shaft were loose or otherwise not forced into the stops over at the pinon end? Bound up so torque didn't fully seat 4th?

I'm guessing.

Walt Fricke