Pete, thanks for posting. After reading through my manuals, it loos like only the Select-O-Speed transmission models came with the "multi-speed" PTO options (540/1000 and 540/1000/ground speed), so I'm guessing that the 4 is for 540 rpm independent PTO with the S-O-S transmission, as my 4000 S-O-S has a 4 and it's got the 540 rpm only PTO, and the 7 is for 540 rpm independent PTO with the 8 speed manual.
If anyone has a later 4000 or a 5000 with a manual transmission and 540 rpm independent PTO that has a 4 in the fifth position of their model number, let me know.
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