Got a 4 speed in mine too 1 is 540, 2 is 750ish, 3rd is 960ish, and 4th is 1100ish i had searched on this site and found it. Can't remember the exact that they said it was. Most attachments would be powered in 1st on the pto
Everything pto wise runs at the standard 540rpm. The other 3 gears is if you want to run something like a pto generator and don't want to crank your throttle wide open and burn up fuel.