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It is the angle of the line strait through the center of the ball joints from front to back on the truck, whereas the camber is from left to right on the truck. Positive caster has the upper ball joint behind the lower(which is what you want). I did an allignment on a 64 falcon, but i had the tools the one guy described, a set of turn tables and a gauge that sticks to the hub with a magnet. Those tools are very expensive and I highly doubt you get it right without them. I have heard of an "oldschool gauge" that you can take measurements off the wheel with, but I dont know where or how to get ahold of one, or even what it looks like. All I can say is, better have a lot of time on your hands!
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