Not familiar with its configuration and whether it has a selector inhibitor - a system that locks the shift until the engine is run and your foot is on the foot brake - this is operated by a solenoid through a relay. If it has this system it would be more likely that the relay has failed. If you have a technical manual check relay positioning. If it foes not have an inhibitor set up we are looking at torque convertor or gearbox. (Inhibitors were introduced for the auto box when people began saying their vehicle moved without driver input -- "unintended aceleration")
SOURCE: we own a 1988 coachman
8 degrees BTDC engine warm & 700 RPM.
distributor vacuum off & plugged. In drive, & accessories off.
Don't forget parking brake on.Hope this helps!
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