The rear suspension is independent. There are upper and lower A arms with rubber bushing on the inner portion that RARELY wear. The bushings cannot be replaced so u need new a-arms. But there are many used ones in junkyards that are very cheap. The outer portion of the a-arm has another bushing which is referred to as the knuckle bushing. These CAN be replaced. There are upper and lower knuckle bushings and they are about $40 each. Any shop can press in the bushings. It’s easy to do an online search for caddy knuckle bushings. I have replaced the on my car.