George Lendich wrote:

Paul,
 Got your comments on the direct oiling of the sun gear in a PSRU and appreciate Tracy's opinion
on this - but how does the oil effectively lubricate the two shaft bearings.
The photos I've seen , mainly on the Ross PSRU show one line entering about mid-point of the
shaft. Does this mean that the oil just finds it own way around the shaft for bearing lubrication
i.e. splash feed  and is this sufficient.
George (down under)

Yes. Ross got away with this for years.

So called anti friction bearings (ball and roller) need very little oil. 
Tracy uses a plain bearing journal on the inner end of the prop shaft 
that requires high pressure oil of considerable volume. Tracy's
concern is; how does the line contacts between the sun gear and 
the planets receive their oil? In the sun gears, if you look closely,
you can see small holes from place to place. These are designed
by Ford to feed oil to the line contacts from the high pressure 
ATF in the hollow input shaft. Tracy uses his high pressure oil
feed to supply oil to these small sun gear holes.

Since Ross got away with no oil at all to the sun gear (other
than that that found its way past the bearings) a low pressure
splash or gravity feed direct to the sun gear also apparently works. 

Paul Lamar
 
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