How do i adjust slack out of the Steering? on 1991 Dodge D150

Truck wanders back and forth, has slack in steering system. Tried to adjust pwr steering gearbox, no luck. How can i adjust-out the slack?

Asked by for the 1991 Dodge D150
Be careful you are not compensating for worn suspension, tie rod ends or other steering suspension components, check all the steering and suspension bushings and tie rod ends and shocks and steering dampers first. Could be a worn out steering box. There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try and get an online repair manual subscription.
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Try changing the coupler on the steering column there is a kit, in it there is a pin about 1/4in in diameter by 1in long that was almsost worn thru on my truck. Once I replaced, it took up slack but not all as the truck has 600,000+ km on it