OK
Wheel sets arrived today, (that was quick, thank you NWSL), and after about 3 hours time, I am happy to report that the Geep 38 is now a fully functional 2 railed diesel.
Only hiccup was that I followed the instructions and added the "trust washers" to all four worms, but it was too much friction (I guess) on the truck with the gear tower, so I had to take that one apart again and remove said washers. It now runs smoothly and quietly.
Happy Holidays to all who might read this ...
Mark in Oregon