KYB KG5487 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Ranger and B-Series

The KYB Gas-a-just KG5487 is a rear monotube shock absorber built for trucks and SUVs that need firmer control under load, towing, or larger wheel and tire setups. It is engineered for direct replacement use on select Ford Ranger, Mazda B-Series, and Jeep Grand Cherokee applications from 1989-2009.

Gas-a-just shocks use a high-pressure monotube design that separates gas and oil for consistent damping response. For Ford Ranger and Mazda B3000/B4000 rear suspension service, the KG5487 is aimed at restoring control without sacrificing everyday ride quality.

Key Features

• Up to 25% more damping performance than original equipment shocks
• Monotube construction for faster response and reduced fade
• Separate gas and oil chambers for stable operation under repeated use
• High gas pressure improves steering response and suspension control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Valving and components tuned for truck and SUV duty
• Dust cover included

Product Details

KYB Gas-a-just shocks are designed for vehicles that work, tow, or carry heavier tires and wheels. The KG5487 uses an air-free hydraulic working area for responsiveness and a nitrogen gas chamber with a floating piston to maintain consistent pressure. That design helps reduce fade from aeration and supports more predictable rear suspension behavior on rough roads, during load changes, and in daily driving.

This part number, KG5487, is a fitment-based rear shock absorber for applications including 1990-2000 Ford Ranger rear, 2001-2009 Ford Ranger rear, 1994-2000 Mazda B3000 rear, 2001-2007 Mazda B3000 rear, 1994-2000 Mazda B4000 rear, 2001-2006 Mazda B4000 rear, and 1993-1998 Jeep Grand Cherokee rear. It also fits select Mazda B2300, Mazda B2500, and Ford Bronco II rear applications listed in the fitment data.

This part cross-references Monroe Shocks & Struts (e.g., 37013) for the same application.

What It Helps Address

• Excessive rear-end bounce after bumps or dips
• Reduced control when towing or carrying added weight
• Shock fade during repeated suspension movement
• Loose or delayed rear suspension response
• Wear-related fluid leakage from aging shock absorbers

Installation Notes and Tips

Verify compressed length, extended length, and mount style before installation. KG5487 uses an E2(12X38) lower mount and E1 upper mount, with a compressed length of 14.21 inches, extended length of 22.72 inches, and 8.5 inches of stroke. Confirm rear-position fitment and application notes such as coil spring front suspension, High Ryder exclusions, or Up Country suspension exclusions before ordering.

For best results, replace shocks in pairs on the same axle and inspect related suspension bushings, mounts, and hardware condition during service. Proper torque and alignment checks help maintain consistent ride and handling after installation.

Quality Assurance

KYB designs the Gas-a-just line for performance-oriented truck and SUV suspension service, with monotube construction intended to maintain damping consistency under demanding conditions. The KG5487 is built to support stable rear suspension control on select Ford Ranger, Mazda B-Series, and Jeep Grand Cherokee applications.