Dave Zuber
TDR MEMBER
With the long wheel base of the crew cab 4x4, you will push the tires in a tight turn, thus wearing the outside edge of the steer tires. Find you some clean concrete and turn the wheels close to the lock and drive in a circle, then get out and look at the concrete, you will see all the black marks you have left. My driveway has all the evidence you need since I turn tight in it every night. I run 80 psi in the fronts and 45 in the rears unless the 5ver is on, then it is 80 all around.
Agree with this. I've seen the same wear on all my front straight axle trucks. The Ackermann angle on these aren't perfect at extreme turns.
http://en.wikipedia.org/wiki/Ackermann_steering_geometry
So, the front outside scrubs more. To fix it, just don't do tight turns. And rotate after the first 5k miles. I've found this effect slows after the tires get a few miles.
I rotate them after