The rear outlet kit for the 4010-4115 is just a set of hoses that extend the front DSCV couplers to the rear.
You cannot "split" the front DSCV as Dutch suggested, you can only use the front OR the rear couplers.
The Fasse valve or any other electric diverter will technically work, but it would be a plumbing nightmare on these tractors, and the line would be very susceptible to damage.
The best way is as Jason explained, you'll need the Power Beyond kit from JD, all the rest (Control valve, hoses, fittings, mounting brackets) all need to be sourced elsewhere. I have all the parts to do mine, even have the bracket made to mount the valve, I just need a free /forums/images/graemlins/crazy.gif day to get the install done. All in all I have $600-$700 invested, and a WHOLE lot of time getting the stuff together and learning all the in and outs about hydraulics.
Clear as mud? /forums/images/graemlins/confused.gif