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Why keep the back org. swaybar and change only the front?
Danix you have aset of springs on your car that you donot know the spring rate of or whether their linear or progressive. Just that they give youa 1inch drop. Plus i believe you have a set of poly LCA'a on the rear axle. This a bad thing for cars that want to turn. Poly bushings in LCA's in crease roll stiffness in f bodies. Now put a big rear bar on the back to further increase rear roll stiffness and now you may have a car that is loose or have a tendency to oversteer in certain situations.
Now a bigger front bar increases front roll stiffness which is a good thing up to a certain point. Too much front bar can cause the front inside wheel to lift when exiting a corner under hard acceleration.
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Do I not get a uncontrolled car if I have a strong one in front and back the stock?
anything possible if you don't know the specifications of the products installed. But a lot of folks use the 35/21 or the 35/19 setup.
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know that the hollow one are ligher, but are they strong like solid one? And what is the diffrent between the hollow and solid?
In order to get near the same strength of a solid bar you have to increase the diameter of the hollow bar. Also the wall thickness of the bar plays an importance part in the equation also.
A good bar manufacturer is ADDCO, Suspension techniques, they sell matched bars for Fbodies.