From : E
Neons are sensitive to wheel balance. If it is not perfect, it induces a resonance that causes steering wheel shimmy. We call it 73mph shake. At the factory, Neon wheel and tire assemblies are balanced within 1/8 of an ounce. Most other tire stores and such can only balance within 1/4 of an ounce and thats assuming that their wheel balancer is calibrated properly (rare) and the guy knows how to run the machine. The resonance occurs due to the front lower control arm rear bushing. When this bushing gets worn, the shake certainly gets worse. To cover all your bases in eliminating the shimmy, make sure your wheels are really balanced. Next, replace the front lower control arm rear bushings (you'll need an arbor press). If you want to reduce the sensitivity to wheel balance and move the resonant frequency (speed at which shimmy happens) up, install some stiffer bushings like the polyurethane Energy Suspension pieces in place of the factory ones. They will definitely make the car ride more harshly over small bumps because the wheel will not recess reward, but hey, everything's a compromise. If we made the car less sensitive to wheel balance without hurting ride harshness, the car would loose its precise steering and handling that everyone loves. Can you say Escort?
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