Congrats on finding it! Daniel is way more knowledgable than me on the interworkings of these tractors. I have taken one apart and planned on providing pictures so anyone interested to see how it looks inside at when I get the time. The rear end uses a sunstrand gear pump. I have never noticed any writing/marking on the transaxle itself, but there are model numbers on the bottom side of the pump- just opposite of the shifter that sits on top of the pump.
Here is a thread I started when I had an issue with one of mine. These rear ends were found in early JD 140 tractors and the Palomino jeep looking mowers.
Like Daniel said above I do have transaxles and gear pumps for sale.
Can't wait to see those pictures!
Sent you a pm about those parts.
These steering columns were made by Ross. I have not checked but pretty sure Cub Cadet used them in some of their models.
The only Cub Cadet ones I found were just as long as this one, found one Wheel Horse one that was close but big money. Wish I could find a steering wheel that was at least close too.