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Thanks again everyone for your comments. All is greatly appreciated. Mission accomplished. I replaced with 2 quarts of Royal Purple 85W-140 and 4oz of Bardahl gear seal. Interesting note...the copper crush washers I removed were smaller than the ones I received from M_x. I used the correct part# from M_x for what is supposed to be 7/8 OD x 5/8 ID copper crush washers. All in all pretty easy. The smelly dark gear oil I removed looked a little dubious. Thoughts are welcome.

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Old gear oil is the smelliest stuff ever. The smell with penetrate through nyrtril gloves.

I heard that the old used some kind of animal fat that turns rancid. Hence the smell.

Probably because no one makes 5/8 ID washers anymore and they sent you 3/4 ID.

Doubt it will ever make a difference as long as they're torqued to spec and somewhat centered.

Just a heads up. As I had no patience to wait. Our venerable vendor actually sent me 1.00 OD x 0.625 ID copper crush washers under part #433248. For $5.00 a washer. Today I received my copper crush washers from fittings.space/ dynapex. They were 7/8 OD x 0.625 ID and 0.75 cents a washer. These were an exact match to what I removed. Like Potato said, I hope this does not make a difference as long as torqued properly. The bolts do have blue monster PTFE seal tape on them. I drove in multiple parades this weekend. So far no leaks. Fingers crossed.

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It seems that leaks mostly come from the large case seal which is simply a huge square O-ring. I added it to the parts cross reference, FYI.

Side note, is the engine oil pan drain plug the same size and use the same size crush washer as the 2x plugs for the rear differential?

Yes, and this can be checked in the parts book

The same plug was used on nearly every engine, Ultramatic, and diff case 48-56

https://packardinfo.com/xoops/html/modules/partslist/index.php?mode=partnumber&SearchValue=426205&ButtonLookup=Go

Thank you. I wanted to make sure I wasn't seeing things when I looked in the parts book as I did see it multiple times.

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