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Check for low fluid.
While under, have ignition on, engine off, in 4th with OD indicator light on.
Wiggle wires from solenoid back to 4th gear switch including feed to 4th gear switch.
If solenoid reacts, correct poor contact.
If a relay in system, check wiring to relay, the to 4th gear switch.
If happens again while driving, pull shifter to rear and right and hold. If reingages OD and stops dropping out, replace 4th gear switch.
If all the above pass muster, time for new actuating piston O-rings.
Duane
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