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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Nothing electrical can cause no reverse engagement.
Yes there is possible solenoid issues but not for the reverse concern.
This vehicle does not have a TCM.
Braking while driving means there are 2 clutches engaged at once, or there is a faulty one way clutch.
The flashing OD light is telling you there are codes stored.
Overhaul is 95% likely based on the symptoms you gave me.
If you can do diag prior to repairs and or plan to remove and overhaul the transmission. Can you do a line pressure test at idle in each gear and give me the pressure readings.
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Thanks for using Just Answer, Chris
Hello again Chris here,