Sway bars do control the weight transfer front to rear...or at least in effect, they do. What they really do is adjust which part of the car gets more traction. With too big a bar in the front than in the rear, more weight and more traction goes over the rear wheels allowing the rear tires to bite more than the front, giving understeer. With too big a bar in the rear, the front tires bite more giving the "loose" or oversteer condition where the rear end tries to pass up the front end. From the factory, most non-racing inspired cars are built with some understeer, because it gives you a nice front end squeel when you go around a corner too fast telling you to slow down.
Nick
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