Jerry...The second adjustment involves the rather huge allen screw that takes up the slack on the "worm". You can adjust just the "roller" slack by adjusting the screw on top of the cover, just don"t over do it...Check free play often while adjusting and dont let it "bind".
The "worm" adjustment requires access to the allen screw (very difficult while in the car) and you have to readjust the "roller" as you adjust the "worm".....A photo from a Haynes manual would help(anybody?) This will take several tries....If the box is not worn out or damaged, The response is almost instantaneous when the input shaft is turned.....Just don't be tempted tighten it up past that point....
This is one of those, "factory set, do not adjust" things the regular service manuals refer to...
Make sure you oil/grease level is up there....Remove two plastic plugs from box top....pump #1 or #0 grease into the bottom one until a steady flow emerges from the top one......I got a new box that required topping off....
Good Luck...