8 3/4 axle end play question ??

I've never adjusted like that. I fully seat the driver's side. That gets ALL the axle play to the passenger's side, where the adjuster is. Then I carefully pull out on the passenger's side axle and VERY carefully push in so AS NOT TO DISTURB the driver's side axle. The distance between where the passenger axle bottoms WITHOUT pushing the driver's side axle back out and pulled all the way out is the end play. That's the whole purpose of tapping the driver's side axle IN, to get all of the play on one side where you can adjust it. If you fully seat the passenger's side axle after you fully seat the driver's side axle, you just "undid" what you were trying to accomplish and now all the play is back on the driver's side.