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probably gear lube, since they're referred to as gear boxes by some people.
I had tried the z-link idea a while back, but there's flaws in it.
first, center the steering box, then put your steering wheel on the way it should be, then put the pitman arm on so it's pointing straight back toward the rear(so it can travel 2 turns in either direction. now center your steering wheels as best you can and adjust the drag link to fit between the pitman arm and tie rod without moving the pitman arm from it's centered position. you should be good to go. I've never adjusted the box in any way myself.
if you have so much play in the steering, do you have extra long shackles in front? any way for your axle to move a little from side to side? that movement could be your slack.
the problem with a z-link is this: as you turn towards the left(driver's side) the pitman arm goes directly left, however since you're pulling upwards at an angle on the tie rod now, instead of directly left, it'll be harder to turn, and not go as far.
and what's worse is when you articulate off road and the drivers front tire goes way down, you'll never turn left, cuz then you'll be pulling almost directly upwards on the tie rod and not sideways.
the drag link and tie rod are supposed to be parallel. even if it means making further mods to the steering system. I had to put a foot tall plate on my tie rod to make up for the 11" of lift I had, and put the ball joint up on top to connect the drag link to. it worked, I had full steering, plus turning while articulated was easier.
the main thing is to pull that tie rod directly left and right, and not upwards on it.

after all, if a shock absorber is mounted at a 45 degree angle, it'll have to work so much harder to dampen the spring cuz you gave it less leverage to do it's job. same thing applies to the drag link.
 

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look at it this way: if you're steering stabilizer has 10" of movement left to right, and then you decide to mount it at a 45 degree angle to the tie rod instead of inline with it, then the stabilizer will limit your steering left and right. you're doing the same thing with an angled drag link. the angle is determined by the mounting points for the drag link, way up high on the pitman arm, and way down low on the drag link is a terrible combo.
those 2 points gotta be as close to parallel as you can get them.
all the z-links in the world aren't gonna make those 2 points parallel with the tie rod
 
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