Knocking in front axle
I had some serious issues with my axle studs holding the wheels and lost both passenger tires simultaneously while traveling down the freeway at 80mph. Fixed everything and hear no more clicking. I think my issue was very uncommon... 
The whole wheel and my spacer came off the jeep. sheared the axle studs right from the rotor. Passenger front and rear at the same time. Not something you want to go through haha
1.5" and yes there was lock-tite but the lugs on the spacers were way over tightened and the seal on the lock-tite was broken so.. The studs just sheared off on the passenger rear and the spacer lugs came unscrewed in passenger front. So just make sure you know who's working on your wheels and what they're doing..
Video of the noise..
http://www.youtube.com/watch?v=mXcZqyxUHrM



Glad your alright