When looking at the front of the truck, the top of the tires are tilted inward, the tires do not appear to be worn, why is this?

 

I have 1996 4x4, 460 and I have the same condition. I just purchased the truck 2 weeks ago and had the dealer perform an alingment, he said that's normal. I don't know. I've asked around and the service guys told that is normal for a diesel...

 

This is known as camber(either the inward or outward tilt of the wheel) and yes it is normal to have a certain amount of camber. If you are really worried just have the alignment checked.

 

Ford trucks overall are known for this. The front springs get weaker over time causing the front tires to tilt in. That's why they only put the straight axles on the new HD trucks.

 

Since I posted a reply, I have found what this is. I did an extensive amount of research, including calling different dealers. The problem is not alignment or weak front springs; it has to with the camber adjustment. The way to correct the problem is to install a camber adjustment plug. This plug is installed on the top of the spindle. The angle of the plug has to be determined at the time of installation.
This camber adjustment will fix the tilting inward of the front tires.
Most Ford dealers don't know this even exists. So if you need to get this fixed, insist that they install this unit. Ford will tell you that the alignment is with in specs, that's BULL, if your tires tilt in at the top, you're going to wear them unevenly.