This is hard to say, but my first instance is to reply to problems as if you could deal with them.

Governor pressure in the transmission opposes control and modulator pressure to some extent and causes the shift valves to move. No governor pressure no shift. Put your gauge in the governor test port and drive the car. Governor pressure is exactly proportional to vehicle speed, starting at 10kph.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician