Need help setting up hydraulic winch control on J.D. 640

[woodman87]

I recently bought a 640 grapple/cable. The winch was removed when I got it, got it all back togethor but I can't find where to hook up pressure and return line going into valve that controls winch. Valve to winch is easy, just trying to figure out where on the transmission to come from to supply pressure to valve.  Any help would be appreciated.