Hy again 32Fordpuchoptop, the valve in the original Suburban system is much more than a mere proportioning valve and it be a mistake to replace it with your Wilwood valve. Mount your Wilwood valve somewhere accessible in the line to the rear brakes so that you can adjust and test until you get it where you like it. As far as location other than accessibility any where in the system if fine, once the system is bled the pressures in the system are the same everywhere in the system, except after valves, hope that helps.