Just something to think about.. The 99-04 auto hubs are complete garbage. I messed with mine when they would lock but not unlock or just one or the other would stick. I pulled them apart and cleaned them up and greased everything but I still had problems. My advice is spend the $200 on a set or Warn hubs. The piece of mind of knowing both your wheels are unlocked when you want them to be is priceless. Driving around with 1 hub locked like I did, I'm lucky I didn't tear my front axel up. The Warns install in about 10 minutes a side. Good luck.