94 2wd suburban

im going to be redoing my front end soon and i noticed my upper a frame bolts straight to the frame on non adjustable brackets ,.not like the older ones that used the shims to adjust caster and camber. just wondering but how the hell does the shop or whoever adjust these angles! or does it have something to do with the ball joints?

There is a plug welded into the adjustment holes after the alignment is set at the facory..to adjust the front end, it will be necessary to remove the "knock outs" to adjust the front end..this is a VERY labor intesive job.

thanks for the info! although i cannot find these knock outs.