I have an ultramatic transmission leak from the vent that I suspect is the result of the speedometer gear being installed backward. Is this something that can be fixed with the transmission in the car?

The 54 convertible in Indiana looks like a real bargain for $12k. If the ad is correct, a lot of work and new parts have already been done.

Looks decent in the pictures but not running $16k
https://denver.craigslist.org/cto/d/evergreen-1947-packard-deluxe-clipper/7606196230.html

I put one of the lug bolts back in at the 9 o'clock position and used a short piece of 2x4 wedged between the bolt and the garage floor.
Put the big axle nut on the end of the axle to protect the threads and to keep the hub from popping off and landing on your foot!

When I replaced my sending unit, I successfully siphoned out most of the gas. I didn't get it all but the tank was manageable when I dropped it and no gas spilled. I put a small floor jack under the tank to let it down easy.

The advantage of taking out the tank is that you can clean it. A consideration if this tank has never been taken off the car.

Agree the sidemounts look terrible. And what is going on with the front and rear bumpers?

I've seen these in several sizes.
For reference, my 39 has a purolator unit that looks like the one from Packard pictured and takes a Fram c-131 cartridge. The dimensions are Diameter: 3 13/16 Height: 4 13/16

Fram no longer makes this size but I have more than I will ever use in my lifetime if anyone needs one.

My 53 takes a different size that is still made.

How worn are your tires?
You might try rotating back to front and seeing if it makes a difference.
I developed this problem several years ago. Putting a new set of tires on cured it.

Make sure that your transmission is actually full. Attached is a page from the shop manual detailing the proper procedure.

My 53 would read full after sitting for a while but if I check it within a minute of running as described, I was almost two quarts low.

Attach file:

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  ultramatic fluid level check.jpeg (240.16 KB)

A good place to get oversize scans is Office Depot. Their copy machines will scan up to 11x17 and you can write the scans to a flash drive. Cost about .27 per scan.