98 Explorer XLT 4.0. I have tried researching this, but there isn't a clear answer. My dash has 3 options: 2wd, 4wd AUTO, and 4 low. From auto to 4low it grinds and I can hear it switch. From auto to 2wd, there is no noise at all. No switch. Lights show up on the dash like they're switching, but I can only HEAR it switch from auto to 4low. Is this normal? How do I know if I'm stuck in 4 auto? I can't do a burnout to test, I've tried. The steering feels fine in tight corners, yet I jacked the car up and all 4 tires spin when in drive. In 4low, only the right side spins. In 2wd and 4auto, all 4 tires spin. What's going on?