hydrostatic drive

I have a 4 wheel drive ( each wheel has a hydraulic motor ) and a hydrostatic drive unit that will power the wheel motors. My question is what kind of a divider valve do I use so that the front two wheels will get the same hydraulic fluid as the rear two wheels? I see that you can buy a pressure divider valve or a gear divider valve. There will need to be one divider valve for forward and one for reverse. Also will the hydraulic oil go back through the divider valve when you are going forward or backwards.
Thank you
marcus

hydrostatic drive