steering gearbox problem

I suspect the aftermarket rebuilds, Cardone, etc.., are set up to OEM specs. They probably expand the wear tolerances to make well worn used parts appear reusable.
The thing is, other stuff has changed that effect the feeling at the wheel. Tire design is the main player. OEM poly cord bias ply tires with their hard sidewalls will drive a lot different than todays radials. That's why, I'm reading between the lines, acceptable wheel play in the work bay was not acceptable in the street.
Maybe Firmfeel, Borgenson, etc... can produce a rack and pinion like feel from a conventional steering gear.
As for changes, there are changes in alignment specs/setup that will reduce the wondering ( chasing the wheel ) you experienced with your radial tires. Moog offset upper arm bushings is the most common path to those altered specs. good luck

Thanks for all the info. Actually the gearbox was turning a bit when we moved the wheel. Apparently someone put shims (1/2 inch) between the frame and the two bolts so the coupler would't hit the header. We removed the shims and are starting to correct the steering. I'll let you know what we come up with. It's great to have a site like this to get insight on some of these problems. It's been driving me crazy. thanks again!