Re: R9 Overdrive Problem

Posted by 39SixSedanMan On 2014/12/16 19:17:43

I too have a 39 with a 40 R9 OD and have worked on many R9's. Sounds like perhaps the bulk ring on the sun gear is not rotating to allow the stoppage of the sungear. My first troubleshooting step, based on your observations, would be to thin the transmission/OD oil, or to fully drain it, flush with kerosene and refill with a lighter oil in order to troubleshoot it. If old oil congeals in the pawl/interlock/balk ring mechanism, it can stick.

I have worked on several Packard R9 OD equipped cars that had been in storage or non functional for years and the above trick worked on each, after checking all electrical components.

I hope this helps.
Pat