Hi Ray Bell . . . I found a lot of Ruckstell information when researching my Truckstell overdrive.
The folks at
Chaffin's Garage give the back story on the inventor of this two speed rear-end.
And here's a link to a circa '26 Owners Manual for the so called
Ruckstell Axle.This technology is a hundred years old!
regards,
stock49