How Many Front Planetary Pinions?

I found this in a discussion on rebuilding a 727
. The large cast-alloy pan holds more fluid and bridges the open section of the transmission case to provide extra strength. The front planetary gearsets in small-block Torqueflites are three-pinion gearsets, while the big-block version has stronger four-pinion front planetaries.

Three- and four-pinion types are directly interchangeable. A four-pinion planetary handles about 33 percent more torque than the three-pinion version