As far as I know, there is no detailed breakdown of the valve body for the 51-4 original Ultramatics other than what you found in the parts manual and a bit on page 12 in the
Ultramatic section of the 51-4 service manual. The first time Packard made a decent complete valve body detail available was for the late 54 Gear Starts and 55-6 Twin Ultramatics.
You might also see if the early version of the
Serviceman's Training manual can help. When describing how the valves operate in part III detailing the hydraulic section, there are some very detailed cross sectional views of the various valves but nothing really showing how or where they fit in the valve body.
Note that both manuals show early version transmissions. Yours may not be exactly the same if some of the field modifications and changes were made. If you check thru the
service index and concentrate on the 51-52 years and to some extent the 53s when looking at some of the Ultramatic service bulletins, you will find where they changed one valve shown in the manuals from a cylinder type to a pair of spring disc like affairs and completely eliminated another valve that was in the case. There was also a significant redesign of the converter for 52 and I believe that was interchangeable so your trans could also have the later converter.
You might also go to YouTube and search for Speedwell Garage to look at some of the Ultramatic rebuilding videos made by Ross Miller.
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