KYB 5550012 Suspension Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Ram 3500

The KYB Gas-a-just 5550012 is a rear suspension shock absorber for 2014-2019 Ram 3500 models with single rear wheels, except auxiliary air spring applications. It uses a monotube design with separate hydraulic and gas chambers to deliver responsive damping and consistent control in daily driving and load-carrying conditions.

Built for the Ram 3500 rear suspension, this KYB Gas-a-just shock absorber is engineered to react quickly to changing road inputs while maintaining ride comfort. Part number 5550012 is a direct-fit option for owners replacing worn rear shocks on 2014-2019 Ram 3500 trucks with the specified rear-wheel configuration.

Key Features

• Monotube shock absorber design for consistent damping response
• Air-free hydraulic working chamber for control and responsiveness
• High-pressure nitrogen gas chamber with floating piston for ride comfort
• Helps resist fade associated with aeration in conventional twin-tube designs
• Rear position application for Ram 3500 single rear wheel trucks
• Dust cover included
• Compressed length: 16.02 in; extended length: 24.49 in; stroke length: 8.47 in
• Lower mount type: E2(14.6x42); upper mount type: E2(16.1x43)

Product Details

KYB Gas-a-just shocks are part of the Gas-a-just line, which focuses on monotube construction and quick damping response. The design separates the hydraulic and gas functions so the shock can maintain control during normal driving and add firmer performance when road conditions or load demand it. This makes the KYB Gas-a-just 5550012 a practical replacement for rear suspension service on the Ram 3500.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application. It also interchanges with OE part numbers 5168920AB and 5168920AC.

What It Helps Address

• Excessive rear bounce after bumps or dips
• Reduced damping control from worn shock absorbers
• Rear-end instability during towing or hauling
• Ride harshness caused by aging suspension components
• Shock fade from aeration in conventional twin-tube units

Installation Notes

Fits 2014-2019 Ram 3500, rear, with single rear wheels and without auxiliary air spring. Confirm mount style, compressed length, and extended length before installation. Replace shocks in pairs on the same axle when service history and wear patterns call for it, and verify that the rear suspension configuration matches the listed application.

Quality Assurance

KYB manufactures the Gas-a-just line with a monotube architecture focused on stable damping response and consistent operation under changing road conditions. Part number 5550012 is built to the listed dimensions and mounting specifications for the confirmed Ram 3500 rear application.