Maximum shear stress in a metal shaft

Question

How can I find the maximum shear stress in a metal shaft given power, rev/s, and gears that remove power?


Note: I know the maximum shear stress will occur on the outside surface of the shaft. I'm not exactly sure how to draw the free body diagrams for each of the sections...

Also when drawing free body diagrams, please use double-headed arrow for moments/torques

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