Bad idea, the hoses flow in the direction they do for a reason. Fill from the bottom, return from the top. Stops air bubbles from getting into the system just like the engine radiator. Switch them back to avoid problems.
Platinum 5.9 2.25" engine pipes 3" Magnaflow cat, 3" Hooker Aerochamber, 3" tail pipe, Ported kegger, 52MM Throttle Body, 24lb injectors, K&N drop in filter, Cast JEEP valve covers, MSD coil and wires, All new 6 piece clear light kit, 255/65/16 General Grabber HTS, 242 conversion, XJ u-joint front axle shafts