A buddies truck weve been toyin with had a bad night last night! Made a right turn off one road to another and the grinding began. Got it hauled to my house and pushed on the rack, then took the cover off to look at the carnage. Too our suprise there was nothing, so i told him tomorrow ill let you know whats wrong. I popped the snap ring out the trutrac and removed that spacer holder and then the spacer, and the pass side c-clip and holder on the end of the axle fell out. Hmm broke axle!!!!! Looks like the grinding was the axle came out of the splines and the ends of the splines were grinding each other.

His truck is a 07 F150 reg cab 4.6, tune, volant CAI, underdrive pulley, trutrac, and 4.30's