Thanks for your help. I folloed your instructions to move tray 4 out and close, but it still said A4. After playing the tray guides for awhile I found that the back plate is broken. The back plate was not moving when I moved the guide in and out. So I set the back plate to 11 (where it is for 8.5x11) and inserted something to block the plate so it stayed in place. Then I set the guide in the front to also 11. When closed the tray, now it said Letter (8.5x11).
Now when making photocopy, it defaults to tray 4.
Thanks again for your help.