Thanks for your comments ChiDiver. I have had a F150 1999 supercab for 2 years now. It had about 40,000 miles on it when I got it. I now have over 107,000 miles on it. The steering and handling always felt loose (looser than my fathers 1999 singlecab longbed). So this is what I have done to my suspension, so far, in chronological order:
1. Front and rear Hellwig sway bars
2. DJM 2" lowering coils/rear shackle/hangers on 3" setting/Toxic drop shocks.
3. Inspection and alignment (said I did not need camber/caster kit)
4. Searched for a faster constant ratio (12 to 1) steering gear box and could not find one.
5. Hard Bed cover.
6. Went from "standard" 265/75/16s to 265/6017s V rated Directional tires.
7. Bought some slightly used Lightning Bilstien shocks, but the toxic shocks had harder compression than the Bilstiens so I did not use them.
8. Cut DJM 2" lowered coil springs to lower to 3 inch lowering and to have stiffer/higher spring rate spring. Screwed up and went too low, so I cut a pair of stock springs and screwed those up and cut another pair of stock springs to the perfect 3 and 1/4 inch lowering with much stiffer spring rate.
9. Had camber/ caster adjustment kit added, lower ball joints replaced and "custom" alignment.
9. Went back and had a different set of "custom" alignment specs. installed.
10. Continued to search for faster ratio steering gear box or steering "quickener" and could not find either.
11. Had idler arm, bother inner tie-rod ends and several very loose rear leaf spring U-bolts tightened up (I never installed the leafspring center bolt with a longer head and my rear axle was not in proper postion due to supercharger use). I also had yet another and the best, custom alignment that was different from the rest. After this last work, my steering feels more "CENTERED" and I have a lot less play in steering wheel with far less wandering.
However, I am trying to get the steering with as much a "CENTERED" powered feel with zero play.
I am going to:
1. Add the rear leaf spring center bolts with the longer head so that, the bolt head goes through the pinion shims and the leafspring plate hole to insure perfect rear axle postion.
2. Eventually get some new tires that do not have all the "cupping" and uneven tread wear from all the screwed up past alignments.
1. Front control arm polyurethane bushings
2. Steering stabilizer
3. Install used but very low miles stock steering gear box.
4. Install 03' Lightning steering gear box that has been re-valved but has the same steering ratio as all late model F150s (14 to 1).
5. Install new Center-link
6. Install new upper ball joints.
7. Install 2" lowered control arms with a 1" lowered spring
8. Install a bumpsteer kit if it ever kits invented.
9. Install new body mount bushings.