The Eibach Pro-Kit 2873.140 is a four-spring lowering set for rear-wheel-drive Chrysler 300C and Dodge Magnum cars. The kit is sold as a set of four springs, and Eibach's progressive-rate coil design is meant to lower the car while keeping everyday ride quality intact. Compared with stock hardware, the kit targets the body motion that makes a heavy sedan feel top-heavy. The manufacturer says the springs lower the center of gravity, which is the main reason to choose this kit over a generic drop spring. The manufacturer notes the kit was tested with factory dampers, so buyers do not need a full coilover setup to get the handling change.
Fitment is narrower than many buyers expect. The manufacturer lists 2005–2010 Chrysler 300C RWD models and 2005–2008 Dodge Magnum RWD models, and excludes SRT8 models, so confirm your drivetrain and trim before ordering. Owners on user forums say the job is a full-day spring swap, and that rear ride height can take time to settle after installation. Searches for 300C RWD lowering springs, Pro-Kit progressive drop, Magnum R/T handling upgrade, and 300C lowering spring alignment usually point to the same install considerations covered below.
No. The manufacturer lists the kit for RWD applications and excludes SRT8 models.
The manufacturer states the kit was tested with factory dampers. Owners on user forums recommend replacing worn or damaged dampers before installing new springs, because running lowering springs on tired dampers can cause handling and noise problems.
Owners on user forums report that new springs may need time to settle. Some owners with aftermarket rear shocks, including Nivomat units, found the rear would not drop until those shocks were replaced. Forum advice is to tighten the lower shock bolts with the suspension loaded and the car on the ground.
This is a moderate-difficulty job best suited to someone comfortable with suspension work, and owners on user forums commonly plan for a full day. Expect to replace front and rear coil springs with the car supported safely, and use a spring compressor when the front struts are disassembled. Owners on user forums suggest inspecting or replacing damper hardware and strut tower bearings during the job, since a creak after installation is often traced to those parts. Set the rubber isolators and perches exactly as they were on the factory springs. Tighten the lower rear shock bolts with the suspension loaded, allow the car to settle for several days, and get a four-wheel alignment afterward, since user forums describe alignment as essential after lowering.
