Quantum Rear Struts. The terms struts and shocks are both used to describe your suspension. The Quantum rear struts (shocks) are inside the coil springs and they are the main part of the front suspension, in fact the assembly holds up the car. To replace the Quantum rear struts, you have to take the spring and strut assemblies off the car and then disassemble them. The entire strut assemblies can be taken off with a few bolts. To take the assemblies apart, you will need a spring compressor. Once disassembled, replace the bearings, snubbers, and dust boots as needed. We have what you'll need!