Re: transmission/overdrive oil for R-9

Posted by Owen_Dyneto On 2008/3/29 13:59:06

Tom, the differential on a 32 and up Packard is a hypoid type which mandates use of an EP gear oil, though it certainly isn't required in the transmission or steering gear box. Without it your ring and pinion will scuff severely. Perhaps the corrosion/pitting you saw was from long storage with condensation in the oil? On the half-dozen 34 Packard differentials I've looked at that sat for decades, there was lots of pitting, especially near the interface of the oil and air. Perhaps a straight GL-1 gear oil is a better choice for the steering gear and transmission, these are just straight mineral oils with defoamer added.