No, the printer is named for my workplace, so I didn't want to post that. I tried making Adobe PDF default and it doesn't do anything, so I'm trying to make it work on my real printer.
If by "print dialog" you mean the first image, that is Adobe Acrobat Pro itself. I have to open a document, click File > Print Setup to get that dialog, which I then have to change to Letter to make it print on Letter. I'd rather it just automatically have Letter populated instead of Legal.
If you mean the second image, that's Adobe PDF in Devices and Printers. It's set to Letter, but that doesn't seem to mean anything, because PDFs continually try to print in Legal.
I hope I cleared it up & thanks.