If only two of my best friends were engineer I would have access to that info... Haha. I would go stout on the lowers, but think about it, how much force it really on the uppers in comparison? The weight of the vehicle plus all of its inertia is pushing down on the control arm between the spring mount and the spindle, but the only force I can think of on the upper arm is the top of the spindle tending to pull it out, that can't be all that much force. The upper arm seems to be more of a geometry guide than anything.
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I <3 forced induction.
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