trouble adjusting 8 3/4 axle end play

Hello All

The problem is fixed, the seal wasn't in all the way. I thought for sure it was but I was wrong. Thank goodness you all were here to help me. I very much appreciate it!
Adjustment was very easy after seal was correct.

Soon my dart will be a 4 speed with 8.75 suregrip with 3.55 gears instead of 904 auto with 7.25 and 2.74 gears. Should be a major seat of the pants difference??

thanks