Originally Posted by DAW89446

Yes and no. Late model Subarus are full time 4wd; asemetrical tires on pavement in 4wd causes slight but constant drivetrain windup.

Your tires with the most mileage are slightly smaller in circumference than those with less mileage (I assume all tires are the same size); there will be a smaller difference in the other two. Off road, these differences don’t make any real difference with your 4Runner in 4wd. Since your truck will be in 2wd most of the time on the road, having a new and old tire on the rear end can be a slight problem if left this way over time.

However, I suggest the tires with the most wear be mounted on the rear. This way they are close in circumfrence for pavement and won’t cause any undue stress to the rear differential in day to day driving.