My power steering seems to fail intermittently, especially when the Jeeps gets a bit hot. I'm going to start with a fluid flush and make sure I have the correct fluid in there. My question though is if there is a system upgrade needed to handle 35x12" tires on a 4" lift? Do I need a heavier duty pump and/or steering gearbox? Any recommendations on parts. I don't have a problem replacing the power steering pump, but if the stock part is going to fail because of being overloaded by the bigger wheels/tires then I'd rather replace with something that could handle the load. My Jeep is also a bit heavy, it has some heavy duty bumpers and rock rails on it, plus winch.