Is it me or is the gasket area on that pan also warped from over-torquing?

Looks like they supported it with a bottle jack...?

Wasn't planning on it. Are they available NOS, or you found some supplier?

I still need to inspect the oil pump I plan to use. Was going to today, but got tired 🥱

For grinding down the pump body, do you just jig them up on a Bridgeport? I assume about 2 thou impeller endplay is the goal?

Ah, good point...

Thanks Jack but I'm not sure I'm following. Why wouldn't a shim with the same ID and OD of a gear, placed next to the gear, help reduce the pressure loss that would otherwise occur through that gap?

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Parts book gives a 5/16 x 24 with lockwasher as Howard said.

https://packardinfo.com/xoops/html/modules/partslist/viewgroup.php?partslist=1948-1954&groupnumber=9.1001&PlateNumber=86&cat=20#resultanchor

I don't know what anyone could possibly use that's metric

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Looks like this is it
https://youtu.be/v0RZVQQVMZs?si=I9EBQDr0yp3G-MkQ

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Hey Mr “The 400”

I have one also and I’d love to see some pics of yours. Can you add some detail what you mean 21 vs 28 circuit? Or where you are shopping for one?

But first if I were you I would go ahead and start a project blog. These cars are very popular in the Packard community so you’ll get lots of help if you ask. If you answer there I will see it.

https://packardinfo.com/xoops/html/modules/newbb/viewforum.php?forum=10

One idea to repair excessive gear endplay would be to punch a 1/2” hole in some 1-1/2” disc shims, 0.002 thk then install one above each gear. The only difficult thing to DIY is getting the ID punched exactly in the center… or just use a 5/8 ID punch LOL.

https://www.mcmaster.com/product/2904T62

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The service manual says to dress it down with a surface plate but there is nothing specific in the drawing. That would be covered in the endplay which as I mentioned, contradicts the service manual. I should measure the endplay, and gear & bore lengths on my pumps and see what they actually are.

One curiosity is that the assembly in the drawing I have does not have the vacuum pump attached. Instead, it has just a plate held on with cap screws.

The one drawing that I asked the Studebaker museum for but that I don't have is the one for body with the late design relief valve, 6492431. I have only the earlier body 440679.

When I have a sec I'll cross reference the assembly BOM on my drawing vs. the parts book. Because I have the important component part drawings, I did not ask them if they had 440679, the assembly drawing as given in the parts book. But while searching they stumbled upon the drawing I did order which is a much newer number and was drawn in mid 1956.