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The Ford F series vehicles are known for their "death wobble" issues and most have been narrowed down to the tie rod ends and/or the steering gear box. With the truck off and the wheels on the ground, move the steering wheel side to side. If there is excess play, solve that issue first for it may be tie rods.
Next is to raise the front end and check the kingpins on the truck. Make sure there is no looseness in them as well as the bearing. Kingpins are checked with up and doan on the tire using a large pry bar. Bearings are checked with side to side as well as spining the tire and feeeling for vibration through the S-Cam. Is there is no issues, then this is when you move to the steering gear box. On it is a 2 stage adjusting nit. You have a nut that goes over a hex top screw. Loosen the nut, then rotate the hex screw clockwise a 1/4 turn, then tighten. Then test drive and see if the steering whobble has goe away. It is a pain with this method, but it is the easiest method to do to check this.
Ford has many complaints of this and for some reason, they haven't addressed it. I've been dealing with this issue for years on a city fleet. I wish they would just correct it and be done with the issue. Even the new vehicles still have this issue. It's been going on since the early 90's. Once the vehicle gets a little bit of wear on the steering box, the death whobble occurs.
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