[MrForbes]

I got the depth mic out of it's dusty storage and kind of accurately measured the apparent end play in an unused 56mm transmission (0.058"). I also measured the depth of the step on the output shaft, and the thickness of the planet carrier plate (0.157").

I see a problem here....and a relatively easy solution towards improving the strength of the DD joint by about 30% by simply adding a selective fit thrust washer, between the output planet carrier and sun gear.