Charlie, the 3203 was only out for a short time (2006->2008), and then was replaced quickly for whatever reason-sort of the red headed step child of the 3-series lineup at the time (I hope not to offend any red headed step children on the forum

so little is available from JD in the way of options for them, and little info in general.
That out of the way...You can replace the oil line #7 in the drawing to feed a new valve, SCV side to the IN port, PB back to the rockshaft, then for the OUT connection you will have to find a port on the tranny case somewhere to place the hose to. It's a custom job, but certainly doable.
Transmission Suction Line And Implement Pump Line
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
1 61M5004 Adapter Fitting 3
2 51M7045 O-Ring 1 19.300 X 2.200 mm
3 38H5004 Adapter Fitting 1
4 T77932 O-Ring 1
5 LVA12845 Oil Line 1 (IMPLEMENT PUMP TO SCV)
6 LVU13422 Clamp 1
7 LVA13165 Oil Line 1 (SCV TO ROCKSHAFT)
8 AM123226 Fitting 1 (W/SCREEN)
9 LVA14310 Oil Line 1 (SUCTION)
10 19M7789 Screw 1 M12 X 30
Cart key PART NO. PART NAME QTY SERIAL NO. REMARKS
11 LVU13981 Spacer 1
12 LVU13424 Clamp 1
13 M134346 Manifold 1
14 LVU13421 Clamp 1
15 LVU13591 Compression Spring