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Ackerman, is the relationship of the steering copmonents relating to the wheelbase. Imagine looking down from overhead of your chassis. Draw a line from the center of the outer tie rod end pivit, through the center of the lower balljoint pivit, and continue on this path (line) to the rear axle. If it is "perfect", in the textbook definition of ackerman, this line should pass through the center of the rear axle (side to side). Now, "perfect" ackerman may make the vehicle twitchy at high speed, but very responsive at lower speeds (say, under 60). Here's a simple way to check yours. Park your truck on flat ground. Then slide under it with a small plumb bob and a sharpie. Hang the plumb bob from the underside of each lower ball joint, and the two outer tie rod ends. Use the grease fittings as the center. Mark the four locations on the ground. Also, mark the center of the rear axle on the ground. Roll the truck out, and then use a chalk line or string to project the two lines back to the axle line. Unless you are willing to modify your spindles, there isn't much adjusting this. It is what it is. Moving the spindle forward a 1/2" or so doesn't have much of an effect.