OK...I fix boats, but leave the truck stuff to the pros...my local dealer has not been any help, but I can't blame him because he can't re-create the issue when he has the truck. 08 F250 PSD, 31K miles, 6" Pro Comp lift, 37"'s on 20"s: Maybe once or twice a day, I lose all power steering assist. When this happens, no noise, pump howling, nothing...just loses all assist. I'll stop, put the truck in park or reverse, back into drive, and the assist is back as if nothing has gone wrong. Fluid is full, looks/smells normal, and there are no know leaks or suspension issues.