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I tried to find a pic of the front axle and all it pieces parts. When the buggy springs have vertical the ride improves because the spring resistance is only provided by the axle movement and not the body roll. that's why a track bar is necessary. When the shackles are at an angle they prevent sway to some extent.
On the stockcar we kept them at a 45* or more, It's little things like this that can make a great difference in ride and handling.