I'm late to the party here, but maybe someone can answer this for me. I just got a great deal on the Yukon 5x4.5 kit and it's currently in transit. What brake rotors and lockouts does the kit use? I want to order spares, but I have no idea what to look up. Also, FWIW, I'm also a member of the harmonic vibration club. I regeared to 4.88 and get the resonance above 62 mph. No vibration with the front driveshaft removed. New driveshafts made it a whole lot better but didn't cure it. Adjusting the front pinion angle helps it some, but then I lose all the positive caster and the thing sucks to drive. I had considered a HP30 for the front, but I just put all the money into my current axle so why not gain the benefits of lockouts.. I don't trailer this thing so the lockouts also afford me a bit of an insurance policy in being able to drive home if I do blow up the front end.