I had bought a 88 chevy k1500 that had a 6 inch suspension lift. I been putting all new parts in this truck and still cant get the sway bar to stop rubbing on the tie rods.

Ball joints are often the problem jack up one front will a few inches and put a bar under tire and lift up to listen for it to make the sound as you lift up on each one at a time

Usually suspension lifts utilize longer sway bar links or relocates the sway bar lower to accommodate the change in distance between lower control arms and the frame.

How is the strut mount on top ?

sway bar links maybe also check that it is front and not rear

If this excessive swaying is due to worn suspension then those worn parts will be tie-rods, shock struts, anti roll bars and the rubber bushings holding the various parts of the suspension in place. General suspension overhaul would be required.
Now if its a normal feature of the vehicle you can improve the handling by fitting harder anti roll bars(sway bars), stiffer shocks, custom tie rods, better quality rubber bushes (polyurethane) and by lowering the suspension with shorter stiffer springs.
I suggest searching for an owners club for your vehicle where you should find some people who are doing the same thing and get advice from those who have been there before - --- You can ruin a cars handling and make it quite dangerous by changing things around, I suggest you search for suspension modification and do a quick 101 of the do's and dont's of suspension modification before you start swapping parts.

Put it on the fame just behind the front wheels and set your stands to land on the sway bars.Do this for each side.

Many older Ford trucks with lower trim levels did not have rear sway bars. I have an 87 Ranger XLT that has a rear sway bar, my one buddy has an 88 XL without one. Both truck suspensions are stock.

is it a nosie your talking about ? if so check the sway bar links make sure they are tight and not cracked or worn in anyway, then check upper control arms as well as tie rod ends. I have seen so many people try to replace everything for a noise and it was the tie rod end! they are very sneaky and can sound like a control arm. same with the sway bar links.you can take a jack put it under the control arm jack it up to where the tire is barely off the ground take a pry bar or strong long bar put under the tire and lift up & down while someone looks under at suspension parts you can also buy a automotive stethoscope for like 10$ to listen to each as you do that. most part stores sell them.

go to gmpartsdirect.com go to the catalog tab, agree select your car year make etc, front suspension/stabilizer bar components/stabilizer bar/bushing this should get you what you need. This web site has all GMparts at reduced prices. Hope this helps with your problem

check the front torsion bars for play or slack, these trucks love front balljoints check them with the truck jacked up under the control arms with a prybar lift the wheels up and down , also the rear diff torsion arms and the rear springs for broken leafs, also could be a camber/caster issue you may have the allignment checked please rate this -jeff