Hey all, I just went thru this on my 03 4.6 w/93K miles. I run 315/35/20 on the rear. Right rear had wear on inner side, the remaining 3 tires had no unusual wear. I took it for an alignment and the camber on the right rear could not be adjusted to spec, close but just out of the accepted margins.

I went on the forums and was advised it was probably ball joints or upper control arm (refered to as the wishbone in parts diagram). I was in denial about this but after lots of prying on the suspension my alignment guy and I determned it could be these two parts so I ordered the wishbone and ball joint for both left and right sides from Rocky Mtn European. I thought since I was messing with one side I might as well do the other. Total parts were $281, alignment $150, labor $377, and two new Vredesteins $500.

For the new allignment we followed recommended specs ie, a full tank of gas, 150 lbs on left and right front seats, 150 lbs in middle back seat and 46 lbs in the cargo area. Everything was able to be adjsuted perfectly. The alignment guy was very pleased with the results and was pretty sure changing the wishbone and ball joint was needed. Hope this helps.