There is also a training book on the unit produced and given to mechanics when it was first seen in the field with the late 54 cars. Same basic unit but was called the Gear Start Ultramatic when introduced. The training book has almost the same info as that in the SM section so not really needed but it may go into a bit more theory of operation detail and how some valves work.https://www.packardinfo.com/xoops/html/downloads/gearStart.pdf
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