Problem: When printing a large layout with the PostScript printer engine, the print is clipped at 54 inches
When using ArcMap to print an oversize layout with the PostScript printer engine selected in the File > Page Layout dialog box, the print job is clipped at 54 inches.
This is a known limit.
Solution or Workaround
Select the Windows printer engine. If it is necessary to print with PostScript, verify that a PostScript capable printer is available and that the PostScript driver supplied by the manufacturer is being used.