Rancho RS551808 Suspension Strut and Coil Spring Assembly - Front

Rancho RS5000X Loaded Front Strut Assembly

The Rancho RS551808 is a front suspension strut and coil spring assembly for Ram 1500 and Ram 1500 Classic applications. It restores factory ride height while adding improved on-road and off-road control through Rancho Cross Tuned technology.

Built as a complete loaded strut assembly, this unit simplifies replacement on late-model Ram trucks by combining the key suspension components into one front-end service part. It is gas charged and engineered to meet durability requirements for daily driving and mixed-use conditions.

Key Features

• Front suspension strut and coil spring assembly
• Restores factory ride height
• Cross Tuned technology for balanced handling
• Gas charged design
• Performance grade construction
• Mounting hardware included
• Extended length: 21.19 in. (538.2 mm)
• Compressed length: 15.43 in. (391.9 mm)
• Travel length: 5.76 in. (146.3 mm)
• Body length: 15.15 in. (384.8 mm)

Detailed Description

Rancho RS551808 is engineered for the front suspension on 2009-2010 Dodge Ram 1500, 2011-2021 Ram 1500, and 2019-2024 Ram 1500 Classic models. As a loaded strut assembly, it is designed to replace the front strut and spring unit with a single service part, helping maintain OE ride height while improving handling response. The RS5000X Loaded line uses Rancho Cross Tuned technology to balance comfort and control for street use and light off-road driving.

This part cross-references Monroe Shocks & Struts 172292 for the same application. The Rancho RS551808 is also listed under interchange references including KYB SR4548, SR4549, and SR4550 for related fitment verification.

Common Repair Applications

• Front-end sag or reduced ride height
• Worn strut performance on Ram 1500 and Ram 1500 Classic trucks
• Excessive bounce, nose dive, or unstable braking feel
• Noisy or tired front suspension components
• Uneven ride quality after high-mileage use

Installation Notes and Tips

Fits 2009-2010 Dodge Ram 1500, front. Fits 2011-2021 Ram 1500, front. Fits 2019-2024 Ram 1500 Classic, front. Verify vehicle trim and suspension configuration before installation, and compare compressed length, extended length, and mounting points to the original assembly. Because this is a front loaded strut assembly, alignment inspection is recommended after replacement.

Quality Assurance

Rancho engineers and ride-tests RS551808 to strict durability requirements for on-road and off-road use. The gas-charged design and performance-grade construction support consistent damping characteristics in demanding truck applications.