Manual Steering issue..

Have you checked all of your tie rod ends, idler and steering gear arm, and ball joints for excessive play? All of these can contribute to slack in the steering wheel. Try having someone turn the wheel back and forth while you look underneath starting at the steering gear arm. If the wheel turns a lot before there`s any movement in the steering gear then the box will need an adjustment. If not you should look for bad tie rods, idler, etc...