tightened my steering box...question.

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For whatever its worth the Fsm states steering wheel free play is to be 40 mm.
 
If you have actual steering box free play- the input side moves and the output doesn't, which is something you can't determine at the steering wheel, you need to be looking at the box while someone turns the wheel (engine OFF)- then rebuilding the box and putting the preload back to factory spec will fix it. Messing with the adjustment nut won't. Tools R Us has done many box rebuilds and probably has explained some of this on the forum, a search for his posts on 'steering box' or similar would probably be educational.

Steering wheel free play can be caused by many factors, and is usually a combination of several. The box is only one of them.
 
I went through this adjustment process while the box was on the bench. I can't imagine trying to do this with the box still on the truck.

Rather than using the SST, a socket tapped over a rag on the end of the input shaft worked fine for me.

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40, or 30mm?

40mm Maximum is what it said. Believe it is in the diagnosing problem section. If its more than 40 turn the screw.

Don't know about minimum.
I was about to adjust mine a little bit when a buddy showed. He went more thay a quarter turn bit I'm not sure how much. Since then the free play 12 to 13 mm.
 
40, or 30mm?
40 mm according to the steering service specs. There is no minimum stated because the overriding spec is correct preload (which results in something less than 40 mm freeplay).
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