You would have to switch the rear end diff to the UXV500 Turf model diff. Although, the Diff on the Turf model will not fit in the frame on the standard UXV500, the mounting points are different as the Diff is larger with an extra set of spider gears in it. Also, the wiring is different as is the dash switch.
On the standard UXV's, the rear diff is locked at all times, when switched to 4WD it engages the front in limited slip mode, basically
3-1/2 wheel drive, then when switched to lock diff it locks up the front and you have all 4 turning at the same time.
The project to switch to turf mode diff would not be cost effective IMO
CJS