I think we're on to something! we have an 07 F350,CCLB 6.0 in the shop today. customer states wife was driving about 45 mph, rounded a slight turn, hit a bump and it started to shake violently. needless to say it scared the **** out of her. took it to ford dealer, they checked tire pressure and inspected the front end suspension components, blamed it on the lift kit, lol.
we compared the angles of the drag link and steering stabilizer to stock. it has a dropped pitman so it is in spec but did notice the extreme angle of the stabilizer with the now lifted suspension. I'm not convinced this is the issue as stock trucks have been known to have these events as well, but it could contribute.
After test driving for an hour trying to duplicate the event, finally got it to happen at about 50 mph after hitting a pretty good bump in the road ( dont try this at home, lol) I would have to say this is a very serious problem!!!
Our opinion at this point is that although we're not sure of the actual cause-tires,shocks, worn parts, what appears to be taking place is an occilation in the front coil springs. the axle is bouncing up and down alt. from side to side, scarry! I dont think dual steering stabilizers would cure this, it does not seem to be a horizontal shake, but a lateral one.
I think the best thing for a truck owner who has experienced this issue to do would be file a complaint with the NTSB. I heard they were already aware of the problem, and the TSB concering seems to want to blame it on aftermarket equipment, or tire pressure or loose/worn components. sure these are certainly a factor, but I suspect a design issue as well. just my two cents.