I am concerned there is something really wrong and am going to run out of warranty before I find out it is. Three times, my truck as acted almost as if it were in 4wd when it was only in two. What I mean by that is that there is a shuddering feeling when I have turned into my driveway. Now I can't get it to do it anymore!!! WEIRD how that happens. I am at 99,000 Miles and I just had it looked at, but the only thing they found was my passenger side wheel bearing and both front axle seals were shot. Any ideas??