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It's a matter of one or the other between pinion and caster angles or to find a happy balance between the two. The factory caster is 8 degrees postitve! When my truck was lifted, and the driveline angle straightened out, caster was reduced to 2 degrees. Wasn't too bad, but had to guide it down the highway, and steering returing to center was less. I found a nice compromise at 4-5 degrees caster and a little driveline angle. It works, no vibration from the angle, even on the hoghway and steering is nice and stable. Also, I set my camber to right around -.5 degrees negative and 1/32" toe in.