as far as i know it is an SM420 transmission,
the question now is what PTO was available to fit these trans,,
Several were available and it depends entirely on what you wish to do with it, i.e., what are you wanting to power with it?
There were single gear single speed, one forward & one reverse, different ratios, two speed, etc. All made for different applications
so it is important that the correct one is selected. Then the problem will be one of locating one in working condition as they are no longer made for the old 420 transmission.
