with out more info the answers you get might be kinda sketchy, on some of the ford boxes you can adjust bearing thrust and remove play by adding or taking away gaskets at the bottom of the box where the 4 bolts holding the plate on, or if it has a slotted screw on top of the box with a lock nut you can remove play with it by releasing the lock nut and turning down the screw till all play is removed, dont tighten the screw to tight or the steering will be real tight driving on the road