Re: What gear oil should I use in my Clipper?

Posted by Peter Packard On 2017/5/3 6:52:39

I humbly suggest that GL4 is the correct oil for Packard transmissions with bronze synchro rings. GL 5 is a death sentence for the brass based components such as synchro rings and bushes. It turns the outer surfaces black and grinds off when friction is applied. I used GL5 in my R6 OD but found that I had a honey looking oil with brass tinges as brass was worn out by the friction additives of the GL5 oil reacting with the bronze components. The GL5 is as suggested best for differentials. I was astonished to discover that GL4 is still the recommended gearbox oil for my 1996 Mitsubishi van as it has bronze synchro rings. You may of course do as you wish...I would suggest that you at least Google ( or explore) the correct oil for manual Packard gearboxes. PT