ya buddy was full of it he obviously broke the flexplate or the bolts backed out and snapped them off in the whole, talked to a few converter specialists and they said to steer clear as it could have potentially damaged the surface behind where the clutches ride. one thing with swapping flexplates i read recently is that the balance is different on the 6.0 and 6.4 flexplates so you should technically have weight taken off of the 6.4 plate if you put it on. i forget how much but it was enough to cause a slight vibration