a while back I replaced/swapped an orbital valve on a buddies truck with a PSC branded orbital. We only swapped them around to diagnose a problem on his fathers rig and never swapped back. The original was good and turned with ease no matter what position the tires were in and drove down the road pretty good. Once we installed the PSC his steering when to shit. While driving down the road to get to the trails you are constantly turning right to keep the rig straight and when you need to turn left it darts. When you are bound up on the trails, say going down hill in a rut the wheels will not turn at all, but the steering wheel will turn but is very hard. All in all it a pain in the ass to drive, unless you are driving around a flat yard. Im not sure what model the orbital is is but can find out if needed. This is on an old toyota truggy with an LT1, D60's, 4linked w/coilovers all the way around. He has a HUGE resi (like 1.5Gallon) with a very short suction rated line going to the pump which worked fine with the other orbital (again I dont know the model number). he uses a chief 2x8 single ended ram. Did he just get a bad orbital or is it mismatched to his system? any Idea's?