How much ya got? As Tom says, 2-4 inches, but when my cars stared having 4" of play, I started looking for a way to tighten it up. There are four adjustments. Two are shaft end play, The lock nut and slotted screw on the engine side of the box. The bolt and lock nut at the top of the box (Above the filler plug). Be careful of this one, just snug it up, do not tighten, it can split the upper race. Then there are two gear positioning adjustments which are a little harder to work with. First, you must slightly loosen the four side cover bolts. then you will see a cam nut in a top corner. Play with it until the wheel is tight. The last adjustment is a slotted screw on the underside of the box that positions the cover. There isa sequence to adjusting the steering box, but I don't know what it is. I'm sure that the
sequence must begin with tightening the end play in the shafts. Also, wiggle the pitman arm shaft to check the bushing wear. Before you do all this, you may want to jack it up and shake the wheels. Loose wheel bearings, kingpins, and spring bushings can cause play and "Death Wobble" (It's not really Death) Another thing that's good to know is the condition of your balls. Take the drag link off where they connect to the other shaft and you'll find a ball that the links connect to. These ball ends get out of round and this will give you trouble. Hope this helps!
Terry