How about the serpentine belt? Is it slipping?
I don't know about the 03's but with Broncos (which are F150 twins) when the ball joints wear, they sometimes get tighter and bind. That'll cause the steering to be tight, and may cause one to wander on the road a bit, because the body will actually move before the tires will start to turn left or right.
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BroncoJoe19
2006 Alt Fuel Jeep (electric)
'98 windstar 3.8L
'99 Crown Vic 4.6L
'90 Full Size Bronco 5.0L
I'm not a professional mechanic, take my suggestions with a grain of salt, or a cup of coffee
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