For what it's worth. I have owned my 4.9L F150 since I drove it off the dealer lot (4 miles on the odometer)in 1994. It has always made a straining sound when taking wide turns. The gent who lives across from me has a 1988 F150 and his is even louder. I have never had a leak or failure in mine (nock wood) and I just think Ford power steering pumps are loud....I have learned to accept it.