Exactly, at full lock the system pressure spikes and causes the pressure relief valve to open. That can occur multiple times when cranking the wheel to full lock doing donuts. Factor in that it’s a 10 year old truck most likely running original components and fluid, add the heat from pressure spikes and no airflow to cool it down, and you have a recipe for system failure. Never mind the fact that Gen 1 used the same PS pump as a standard F-150, but had to deal with the extra weight and 35” tires.going to have to disagree here. the oem pump works fine. its the driver. my pump lasted 172k miles before a hose split and blew my pump because i lost all fluid. i come from a background of rally and drift, and just about everyone i have talked to, end up doing something wrong that causes the pump to go. mainly 4wd and full lock on the wheel. countless people have blown their pump doing donuts and more so in 4wd. when on bumpy and rutted terrain at high speeds people are sawing at the wheel. fighting the wheel also causes these problems. you have to learn to steer with smaller wheel input and more throttle response. if anything a larger cooler would help more than a pump