Hey guys, my dad has a 2006 Ford F350 4x4 6.0L, ~106,000 miles. Recently there have been a few VERY DANGEROUS events with this truck. The truck will at random start to veer off of the road, at even 25 mph you it is a big struggle to keep it on the road. The first time it happened 3 lanes were crossed in each direction at 55 mph. It is not safe to drive in this condition. The thing is, we can't figure out what is wrong with it. It only happens intermittently. Here's what we've checked and know to be good: -After the first instance, we had a local tire/alignment shop look at truck. They re-aligned it, put on new shocks. They said that the ball-joints, tie-rod ends, and king pins were in good shape. -Power steering fluid is full. -Tires are in like new condition and are balanced. Rotated the tires front to rear. Has anyone ever seen anything like this before? It is definitely bizarre to say the least. Any help would be appreciated.