Just to add to conversation...Spindle is the way to go if money is not an issue and the truck is 2 wheel drive.
Think of it like this;
- Coil drop means you loose 2 inches of travel height, which means shorter shocks, which results in higher likelihood of bottoming out suspension i.e. hitting bump stops.
- spindle drop is the better way, leaves the factory suspension height, shocks etc. In short think of your spindle as a vertical shaft spins right and left and that has a hub mounted on it for the wheel and tire to turn on. Now take the factory vertical shaft and move the hub the tire and rim rides on up 2 inches.
-Only real draw back is that it does place the lower control arm closer to the ground and therefore at slightly higher risk for contact with objects in the road (road kill etc.), or dragging it in ruts if you go off road.
If you want to maintain a comfortable factor street ride then spindle drop.....
If you want to road coarse, scca race then springs as it will have less suspension travel, therefore less body roll and by default a lowered spring will have more tension, i.e. be a firmer spring which is what you want on a road course but not on a daily driver
FYI, your change in tires will already have a major impact on how the truck handles and rides as there will be less give in the tire compared to stock. So A lowered spring and the tire change you are making will definitely have a harsher ride. A spindle drop will keep the "factory ride" but the tire will give it that tighter handling feel.
These trucks do roll a little on the factory suspension, but a lot of what you feel in your butt from the factory is the tires rolling over. Lower profile tires as you will have will have little to no side rolling in a corner.
4X4s have the front axle shafts to deal with and lowering spindle can be more problematic.