Why do I have such sloppy steering?

Sloppy would be an understatement for my 70 Dart...I'm not a gearhead but enjoy working on her...the steering box adjust will work but mine was at the end of its adjust so I had a brake & alighnment shop do a complete rebuild-everything, it was over $1k but worth every penny....hands off the wheel & she tracks straight down the fwy @ 70.