I'm experiencing very tiring wander on my '05 F350 4x4. The truck is 100% stock aside from a 2.5" level kit. YES, it wandered before the kit, so it's not the kit causing the problem.
We bought the truck about 20,000 miles ago and have experienced the problem the entire time. I have replaced the steering box (OEM from Ford) and the drag link (OEM). The truck has been aligned since installing the 2.5" level kit.
The truck continues to wander side to side - It doesn't pull stronger one way or the other, it just feels like there is a dead spot in the steering. To keep the truck in a straight line requires CONSTANT adjustment. It is very fatiguing. Driving at highway speeds with more than 3 lanes wide is very hard and we are fighting the wheel constantly.
I have checked:
Sway Bar Bushings
Steering box (replaced)
Drag link (replaced)
Steering Stabilizer (replaced)
Again, the truck is stock aside from the level kit.
I'm really not sure what to look at next. The bushings LOOK okay, but could a bushing really be causing my problem (trailing arms or track bar bushings?).
What could be causing the wandering? I've GOT to fix it - I refuse to believe this is just how these trucks are. My wife's family has had them for years (3 were 05+ models) and we've never seem wandering like this. It's so bad it's unsafe.