What upgrades to the steering to make these trucks handle better?
Do you have to include suspension mods also?

 

https://www.dieseltruckresource.com/...220996&page=21

 

A sector shaft stabilizer will reduce a bunch of bump steer. The new upgraded steering setup previously linked also helps. Aside from that, thinner tires and a heavier steering damper.

 

depends if anything is worn. actually a sector shaft stabilizer can take side to side play out of steering if your gear box is already going south but it is intended to prolong the life of a good box. you shouldn't have bump steer unless your track bar and pitman arm drag link are out of parallel from a lift. How many miles??

If your rod ends are worn the new linkage could help. If they and upper ball joints, track bar bushings, and gear box are tight you really shouldn't even need a stabilizer with stock tires. Properly valved shocks, variable rate spring coils up front, and replacement leaf packs out back can make a big difference in handling IMO...