The S40 is a small car from Volvo that was developed during Ford's ownership of the company. The S40 is based on a joint Ford/Mitsubishi platform, the "Carisma." It is popular in northern cities due to it's optional all-wheel drive (AWD) and Swedish winter proofing. The sway bar on the S40 serves to link the front steering knuckles so that they do not move too much out of alignment from each other. The bushings absorb some of the torsion to prevent it from warping the frame.
Park the S40 in a flat, open area where you can work on the car without being endangered by traffic. Put the emergency brake on and turn the S40 off. Jack up only the front of the car, because the sway bar is on the front of the S40. Slide in jack stands to keep the front elevated and make sure they are firmly seated before going to the next step.
Unbolt the right side of sway bar bolt first from the steering knuckle. Then unbolt the left side of the sway bar from the left steering knuckle. The sway bar runs between each steering knuckle, bolting on to the bottom with a single bolt. Between are two metal supports with a plastic ring holding the bar; that is the sway bar bushing. Unbolt the two bolts that secure each holder to the bottom of the S40's frame.
Pull the sway bar and supports off the frame and out from under the S40. The bushings will each have a slit in the side; use a rubber mallet to knock the bushing off the sway bar. Then slide on new bushings. The bushing are quite stiff when new, so use the rubber mallet to get them on.
Bolt the sides of the sway bar back on. First bolt onto the right steering knuckle, then the left. Slide the metal holders onto the bushings, then slide the holder until they line up with the bolt holes. Bolt the metal supports into place on the S40's frame, making sure the bushings are under the metal holders. Lower the S40 off the jack stands, then take it for a test drive. There should be significantly less roll when cornering.
