Ed/Charo,

If you would like to build a 3.17:1 box and use
the rear planet one trick is to EDM out the roll pins
holding the six planet shafts in and replace them with
hard shoulder bolts. Then screw the shoulder bolts into
a flange on the prop shaft. Makes a real elegant box.

This will work on the front planetary too if you wish 2.85:1.

I am leaning towards a splined prop flange held on with a large nut.
A lot like a Merlin. Fits a hollow prop shaft well.

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Better picture of the Merlin prop shaft.

Easy to install needle rollers. Also easy to take
apart and inspect everything.

Also hundreds of Ross boxes used rollers so a separate oil
supply is no big deal. No hot high pressure oil from the engine
required.

Paul Lamar