KYB KG4159 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock for Aspen and Durango

The KYB Gas-a-Just KG4159 is a monotube suspension shock absorber built as an OE-style replacement for rear applications on select Chrysler Aspen and Dodge Durango models. It is engineered to restore original handling response while adding the firmer control needed for towing, heavier wheels, and demanding driving conditions.

Key Features

• Monotube OEM replacement design for direct suspension service
• Separate gas and oil chambers for consistent damping and quick response
• High-pressure nitrogen gas supports fade-resistant operation
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Improves steering response and suspension control under load
• Dust cover included for added protection
• Compatible with electronic safety systems that rely on factory suspension behavior

Product Details

The Gas-a-Just line is KYB’s monotube shock absorber series for vehicles that work harder than average. The KG4159 uses an air-free hydraulic working area for control and a separate high-pressure gas chamber with a floating piston for immediate damping response. That design helps maintain stable ride quality during normal driving while delivering firmer performance when the suspension is under stress. This part cross-references Monroe Shocks & Struts (e.g., 911260) for the same application.

Compatible With 2007-2009 Chrysler Aspen, rear and 2004-2009 Dodge Durango, rear. For shoppers searching for a rear shock absorber for 2007-2009 Chrysler Aspen or a rear suspension shock for 2004-2009 Dodge Durango, KYB KG4159 is the correct monotube replacement to restore factory-style control.

Common Issues This Shock Can Address

• Excessive bounce or poor body control at the rear suspension
• Reduced steering response caused by worn shock damping
• Fluid leakage from a failing shock absorber seal
• Harsh or unstable ride when towing or carrying heavier wheels and tires
• Loss of consistent damping performance during repeated suspension movement

Installation Notes and Tips

Install according to the vehicle manufacturer’s instructions. On the listed Aspen and Durango applications, replace the suspension strut and coil spring assembly as directed by the service procedure. Verify compressed length, extended length, stroke, and mount style before installation: compressed length 15.11 in., extended length 23.89 in., stroke 8.78 in., lower mount E2(12X41), upper mount E2(12X47).

Quality Assurance

KYB designs the Gas-a-Just KG4159 as an OE monotube replacement to help return the suspension to factory-intended control and handling. The monotube construction, high gas pressure, and chrome piston rod are selected to support responsive damping and reduced seal wear in demanding rear suspension service.