In anticipation of getting all of my goodies for the front end, I am trying to understand the test procedure for the kingpin bearing load test. There were shims in both upper bearing caps and I have kept them as they were when I tore it down. And BTW, both side kingpin bearings were shot. Drivers side upper was the worst (I think I posted a pic of one previously).

The Universal Series Service Manual talks about a scale reading of 12 to 16lbs when the knuckle has started its sweep. I understand the sweep of the knuckle, but don't know of a simple way to measure this load. How critical is it to get it spot on? Will a "resistance feel" tell me the same thing?