From my previous post:
>On the SOMA axles used on the S26, the crownwheel/pinion gear sets can be between 35x7 and 27x20. The hubs are about 4:1 while the overall axle ratio would be about 7:1 for medium duty work up to about 100 tons.<
The half shaft is clearly shown in post 14, item 12, and is splined to accept the sun gear rather than having a drive flange.
The crown wheel, pinion and half shaft are similar to a conventional axle but lighter duty as the torque is produced at the hubs. The highest overall reduction would use the 35/7 cw/p to give a 5:1 which multiplied by the 4:1 hubs gives 20:1. This would be used on something like a site dumper or yard crane operating at low speeds while at the other end of the scale the 27/20 cw/p gives an overall ratio of about 4.8:1 suitable for 70mph.