hey biscuit, welcome to the garage! hope ya got a picture to get in the gallery, we like pictures!!
do a search here for dump hydraulics - been discussed, and somebody knowledgeable gave a lotta info on different makers - the dump beds were all aftermarket as George sez, and if it's quite old you likely won't find anything more than generic info, but it's not rocket science, just talk to any farm equipt repair place in your area
Bill
