KYB KG5507 Suspension Shock Absorber - Rear

KYB Gas-a-Just Rear Shock KG5507

The KYB Gas-a-Just KG5507 is a monotube rear shock absorber built for classic full-size cars and performance-oriented street use. It delivers quicker response than a conventional twin-tube design, with separate gas and oil chambers to reduce fade and maintain consistent damping.

For applications such as Chevrolet Impala, Buick LeSabre, Cadillac Fleetwood, and Pontiac Bonneville rear suspension service, this KYB Gas-a-Just shock is designed to restore control while adding firmer damping where the vehicle needs it most.

Key Features

• Up to 25% more damping performance than original equipment shocks
• Monotube construction separates gas and oil for fade-resistant operation
• High-pressure nitrogen gas provides fast response and improved steering feel
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components are tuned for classic cars and heavier-duty street use
• Supports vehicles with towing loads, larger tires, and heavier wheels
• Dust cover included

Product Details

Gas-a-Just is KYB’s performance shock line for drivers who want more control without giving up everyday ride quality. The KG5507 uses a high-pressure monotube layout that reacts quickly to suspension movement, helping keep the rear of the vehicle composed over bumps, load changes, and cornering inputs. Part number KG5507 is a direct-fit rear shock absorber for a wide range of rear applications across Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac models.

This part cross-references Monroe Shocks & Struts 550013 for the same application.

What It Helps Address

• Excessive rear bounce after bumps
• Reduced damping from worn or faded shocks
• Loose rear-end feel during braking or lane changes
• Body motion caused by heavier wheels, tires, or towing loads
• Uneven ride control on classic full-size cars

Installation Notes

Fits rear position applications only. Confirm compressed length 13.54 in., extended length 21.89 in., and stroke length 8.74 in. before installation. Lower mount type E1 and upper mount type E3 (61.6 x 87 x 20) should match the vehicle’s original mounting points. This shock is listed for vehicles with and without certain suspension options, so verify notes for electronic suspension, limousine, heavy-duty, air suspension, or other exclusions before ordering. Part number KG5507 is commonly selected for rear suspension refreshes on Chevrolet Impala, Cadillac Fleetwood, and related GM platforms.

Quality Assurance

KYB designs Gas-a-Just shocks with monotube construction and high-pressure gas separation to maintain consistent damping response and reduce fade during use. The KG5507 is built to support stable suspension performance and preserve the vehicle’s intended handling characteristics.