Paul,
          When you get time.  How do you get 3.17 ratio out of tracy’s
Redrive.   I have the gears on my bench and can get 2.17 with reverse
prop turning,  the normal 2.85 with same prop direction, but the 3.17
has me stumped.  What have I missed??  Neil.

Normally the ring gear is held and power is taken out of the planet carrier.
In that case the prop turns in the same direction as the engine.
Counter clock wise looking from the front of the airplane.

If that does not work you have the wrong planet set or a measuring error.

There are three planet sets in the late Ford boxes. Front to back.
The first is the OD planet set. The next has been historically known as the
front planet set. And the last the rear planet set.

The rear planet set looks like this.

Paul Lamar

They made both as I recall.
Some of the very early ones had only 3.

Paul Lamar
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