[Steeveedee]

The pittman arm is probably installed incorrectly. To the OP- disconnect the pittman arm from the steering gear box (that is really fun), turn the steering wheel lock to lock, recenter it to half the number of turns, set the wheels facing straight ahead and then reinstall the pittman arm on the box. Go ahead, ask me how I know. An easy check before doing all this is to drive it down the road and notice that it just doesn't hold the road. That comes from not having the steering box sector gear on the high spot due to incorrect pittman installation. Once you get that straightened out, get the front end aligned properly. THEN turn the wheel as needed. It is critical that you tell the guy aligning your truck after this that the steering wheel probably doesn't match up with the steering geometry after all the front end work. Otherwise, they will just center the steering wheel and adjust the tie rods, which may still end up having the pittman arm off by one tooth, which will still give the "hunting" problem, going down the road. It is important to note that this is extremely rare, and most shops will not know of it, since most people never tear into a vehicle like was done here. HTH.