Watch the pressure gage on the dash (transmission pressure) when making a shift from high to low range to go right the gage should dip and come right back up. if it does not I would look at the right hand spool in the control valve.
The spools were a two piece arrangement with a snap ring in a groove holding them together, I have seen them fail and the spool pieces separate and the spool not move. If you get a cooperative dealer you can get a replacement but they are not shown in every parts book that uses that spool. That tranny was used clear up through the series from 450 through 850 so searching the books to show a breakdown of the spool may be necessary, the later model year books are most likely to show a pic of it, HTH.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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