Lincoln Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
For the transmission not to automatically upshift in drive based on the symptoms you listed. It is going to be a faulty PCM, shift solenoids, or sticking valves within the valve body. The 2 shift solenoids can be tested while out as well as the valve body inspected. For the PCM command you would need to monitor the solenoid wiring from under the vehicle while on a rack and verify when the PCM shows a shift to occur the correct solenoid is getting a ground supply.
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Hello again Chris here,