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Watching your video, I actually saw no malfunctions. What I saw seemed to be a normal operating 4.0 and your slight movement is nothing to be worried about. The 4.0 balancer, when it's bad, will definitely be evident.
Black '07 4.0 coupe. 18" Bullitt Wheels, Bullitt susp & GT brake upgrade, GT500 strut plates, Dynamax exhaust w/GT mufflers, S/D Coil, Live Wires, JLT CAI w/Diablo tune, Hood struts, IPU, GT MyColor, Leather Pwr Seats, 13 Boss Strg Wheel, a/dim mirror, Homelink, amb light console, Ford Nav/SYNC, hood scoop, qtr & side scoops, r/w louvers, GT500 spoiler, CS/GT frt & rr bumpers, rad ext & batt-m/cyl covers, underhood caps, plenum cover, tloc 7.5 w/3.73's, Seq t/lights, trunk switch.
An easy check though is take a white marker and draw a line from the center of the pulley straight out to the edge. Check that after driving and see if there is any movement. When the balancer goes it will wobble enough to break the straight line.
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