my 1009 has 1 ton axles with the bilstein shocks and the ride is excellent. I have 4 inch lift ez ride tough country front springs and 4 inch shackle flip, stock rear springs. I also installed the ford shock mounts from ORD.
I also have 1 inch zero rates front and back for a total of 5 inches of lift. I don't have a sway bar and I am considering putting the stock one back on with sway bar drop kit.
Truck can get into a sway back and forth situation if you are sawing in the steering wheel on the highway. I have hydro assist steering and it holds the wheels straight. when the truck rocks back and forth due to bumps in road you have a tendency to work the wheel back and forth just a little. Doing this can cause the truck to start a bad sway. It is not side to side but more of a front to back wiggle. If it starts to happen best thing to do is let go of the steering wheel and it stops. It is controllable and once you know how to drive the truck, it does not happen.
The problem is when you hit a bump and think you need to correct with the steering wheel, you don't, just keep the wheel in one place and the truck rocks a little and keeps going straight.
Without the hydro assist, It was a much bigger problem.
I have 39 inch tall by 11 wide tires on 16 inch rims, the large tire on the small rim creates some sway just in the tires. (yes, the front fenders are heavily modified but in a way it is hard to tell)
I thought the hydro assist would only be a help off road but it is a great help on the high way. The truck really drives straight even on bumpy roads, you can drive it with one finger and only minor corrections are needed in the steering wheel. It has zero bump steer with the hydro assist and thus you need no steering corrections when driving on rough roads.
I think they cross over hydro steering is one of my favorite changes in the truck.
I will also add that a front selectable locker is probably the best off road accessory you can add to the truck. When all 4 tires are locked together it drives like a bulldozer. It only gets stuck if you high center the axles for which I have managed to do once already.
Rich