KYB 551136 Suspension Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Chrysler 300 and Dodge

KYB Gas-a-Just part number 551136 is a monotube suspension shock absorber built as an OE-style replacement for rear applications on the Chrysler 300 and Dodge Challenger and Charger. It is designed to restore original handling response while adding the firmer control expected from a high-pressure monotube design.

Key Features

• Monotube OEM replacement for rear suspension applications
• Separate gas and oil chambers for consistent damping and quick response
• High-pressure nitrogen gas helps maintain fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Improves steering response through higher gas pressure and faster reaction
• Supports vehicles that tow, work, or run larger, heavier tires and wheels
• Helps maintain the suspension performance expected by electronic safety systems
• Rear shock absorber dimensions: 17.91 in. compressed length and 24.25 in. extended length

Product Details

The KYB Gas-a-Just line is built around a monotube layout with an air-free hydraulic working area and a separate high-pressure nitrogen chamber. That design gives the shock absorber immediate response during normal driving while adding firmer control when the vehicle is loaded or driven more aggressively. For Chrysler 300 rear shock replacement and Dodge Charger rear shock replacement, KYB 551136 is a direct-fit suspension shock absorber for the listed applications.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. KYB also recommends replacing strut mounts, part number SM5533, to reduce noise and vibration during service.

What It Helps Address

• Excessive rear suspension bounce or poor damping control
• Delayed steering response and loose-feeling handling
• Shock fade during repeated load changes or spirited driving
• Fluid leakage related to worn piston rod sealing surfaces
• Reduced suspension consistency on vehicles with heavier wheels and tires

Installation Notes

• Fits 2022-2023 Chrysler 300, rear; recommended OEM replacement; Gas-a-just
• Fits 2021-2023 Dodge Challenger, rear; performance suspension without electric suspension; Gas-a-just
• Fits 2021-2023 Dodge Charger, rear; recommended OEM replacement; Gas-a-just
• Fits 2011-2021 Chrysler 300, rear; replace suspension strut and coil spring assembly according to manufacturer instructions; Gas-a-just
• Fits 2011-2020 Dodge Challenger, rear; recommended OEM replacement; except electronic suspension and without sport suspension; Gas-a-just
• Fits 2014-2020 Dodge Charger, rear; recommended OEM replacement; except load leveling and heavy duty suspension; Gas-a-just
• Fits 2018-2019 Dodge Challenger, rear; recommended OEM replacement; without sport suspension; Gas-a-just
• Fits 2017-2019 Dodge Challenger, rear; replace suspension strut and coil spring assembly according to manufacturer instructions; Gas-a-just
• Fits 2011-2016 Dodge Charger, rear; replace suspension strut and coil spring assembly according to manufacturer instructions; Gas-a-just
• Fits 2011-2013 Dodge Charger, rear; recommended OEM replacement; except load leveling and heavy duty suspension; Gas-a-just

Quality Assurance

KYB designs the Gas-a-Just line as an OE monotube replacement to help restore factory-style suspension control on Chrysler 300, Dodge Challenger, and Dodge Charger rear applications. The part number 551136 uses a monotube construction with a high-pressure gas charge for consistent damping performance.