Please help me!!!

The control arm bushings absorb the shock of road bumps. When it's broken or incapable of functioning, the vehicle will continuously vibrate at the time of driving. It will also cause the metal sleeves of the control arm rattle uncontrollably, creating annoying clunking sound coming from the front wheels.

It is not necessary to replace both lower or both upper control arms if one is bad, but often they wear out at roughly the same mileage. If one control arm is bad and the other is on its way, it makes sense to replace both arms at once. This way, you only need to do the wheel alignment once.

One of the first symptoms commonly associated with bad control arms is steering wheel vibrations. If the bushings or ball joints in the control arm become excessively worn it can cause wheel shimmy, which may cause vibrations that may be felt in the wheel.

In some cars, a ball joint is bolted to or pressed into the control arm and can be replaced separately. Control arms have a very important role holding both front wheels on the road. If a control arm is excessively worn, damaged or bent, the vehicle is NOT SAFE to drive

The need for an alignment after lowering the car is different from replacing the upper arms. If you are just replacing the upper arms, you shouldn't have to worry about an alignment unless your old arms were heavily worn and had significant play. K, alignment it is then.