Maybe this:

"Its designed to be a simple procedure because people do complain of
the lack of reverse....Not sure of your model but on my 3204, you will
need to look at the foot pedals underneath the machine. Look closely to
where the reverse pedal contacts and you will see a plunger and a small
metal tab...if you move the metal tab you are good to go...no cutting
wires or jumping switches... "

From this site:
http://www.tractorbynet.com/forums/p...&t ype=thread