Fits select 1980-2004 Dodge Dakota and Durango, and Ford Bronco, F-100, F-150, F-250, F-350, and Ranger.

The KYB Gas-a-just KG5440 is a high-pressure monotube shock absorber designed to provide significantly more control and responsiveness than traditional twin-tube designs. This shock features a completely air-free hydraulic working chamber and a separate high-pressure nitrogen gas chamber with a floating piston. This design eliminates performance fade caused by fluid aeration, ensuring the valves react instantly to road conditions to maintain tire contact and vehicle stability.

• Monotube design for superior heat dissipation and consistent damping performance
• High-pressure nitrogen gas charge prevents fluid foaming and aeration fade
• Automatically adjusts to performance needs for improved handling and control
• Supports vehicle safety systems by maintaining proper suspension geometry
• Heavy-duty construction with high-quality seals for extended service life
• Manufacturer Part Number: KG5440

Fits select 1999-2024 Chevrolet Silverado 1500/2500/HD, GMC Sierra 1500/2500/HD, and Dodge/Ram 1500/Classic models.

The KYB Gas-a-just KG54342 is a high-pressure monotube shock absorber designed to restore or exceed the original handling and control capabilities of your truck. Unlike standard twin-tube shocks, the Gas-a-just features a completely separate hydraulic fluid and nitrogen gas chamber divided by a floating piston. This design eliminates aeration and foaming, ensuring consistent damping performance even during heavy hauling or off-road use.

Built for durability and responsiveness, this rear shock uses a seamless cylinder to provide a better seal and prevent internal leaks. It is an essential component for maintaining the integrity of electronic safety systems, such as ABS and stability control, which rely on consistent tire-to-road contact. This unit is a direct-fit replacement for the factory rear shocks on compatible full-size pickups.

• Manufacturer Part Number: KG54342
• Position: Rear
• Design: Monotube with high-pressure nitrogen charge
• Separated oil and gas chambers eliminate performance fade
• Installs to factory mounting points with no modifications required
• Restores OE steering response and braking stability

Fits select 1999-2007 Cadillac Escalade, Chevrolet Silverado/Tahoe/Suburban/Avalanche, and GMC Sierra/Yukon (including Classic and 1500 series models).

The KYB Gas-A-Just high-pressure monotube shock absorber is an OE-specification replacement designed to restore your vehicle's original handling and control capabilities. Its monotube design automatically adjusts to road conditions, providing a firmer, more responsive ride compared to standard twin-tube shocks.

• Advanced Monotube Design: Utilizes two separate working chambers—an air-free hydraulic piston area for instant responsiveness and a high-pressure nitrogen gas chamber with a floating piston for consistent damping under load.
• Safety System Integration: Maintains the critical suspension geometry required for Electronic Safety Systems (ABS, ESC, and Traction Control) to perform as originally engineered.
• Durability and Performance: Eliminates performance fade and aeration common in twin-tube designs, ensuring stable performance during heavy-duty use or towing.
• Installation: Designed as a direct bolt-on replacement for factory front shocks.
• Manufacturer Part Number: KG54327

Fits 1996-2002 Toyota 4Runner Base, Limited, and SR5 models.

The KYB Gas-A-Just (KG54317) is a high-pressure monotube shock absorber engineered to restore the handling and stability originally designed for your Toyota 4Runner. Unlike standard twin-tube shocks, the Gas-A-Just features a specialized dual-chamber design that separates the hydraulic fluid from the nitrogen gas charge to eliminate performance-robbing aeration and oil foaming.

• Monotube Technology: High-pressure nitrogen gas charge and a floating piston provide immediate responsiveness and consistent damping performance.
• Precision Control: Features an air-free hydraulic piston and valve area for precise control during cornering and off-road articulation.
• Safety System Compatibility: Restores the suspension performance required for modern electronic safety systems, such as ABS and traction control, to function as intended.
• Durable Construction: Engineered to original equipment tolerances for a direct-fit installation on the rear axle.
• MPN: KG54317

Fits select 1960-1995 Saab 96, GT750, GT850, Monte Carlo, Sonett, and Suzuki Samurai.

The KYB Gas-A-Just high-pressure monotube shock absorber is designed as a performance upgrade or original equipment replacement to restore your vehicle's handling and control. Featuring a sophisticated two-chamber system, the Gas-A-Just separates the air-free hydraulic fluid from the high-pressure nitrogen gas to eliminate aeration and performance fade during demanding driving conditions.

• Monotube Design: High-pressure nitrogen gas charge and a floating piston respond instantly to road inputs for improved stability.
• Consistent Control: The air-free hydraulic working chamber provides consistent damping and responsiveness that twin-tube designs cannot match.
• Safety System Support: Helps maintain the performance of braking and electronic safety systems by keeping tires firmly planted on the road.
• Application Specific: Specifically valved and designed for compatibility with vintage Saab and classic Suzuki Samurai suspension geometry.

Manufacturer Part Number: KG4616

Fits select 1955-1985 Avanti II, Buick Riviera, Chevrolet (Bel Air, Corvair, Corvette, Impala), Pontiac (Bonneville, Catalina), and Volvo (142, 144, 145, 164) models.

The KYB Gas-a-just is a high-pressure monotube shock absorber designed to provide significantly more control and response than traditional twin-tube designs. By utilizing a completely separate hydraulic chamber and a high-pressure nitrogen gas chamber, the Gas-a-just eliminates performance fade caused by aeration (foaming) during spirited driving or rough road conditions. This design allows the shock to instantly and automatically adjust to your performance needs, keeping tires planted and electronic safety systems operating as intended.

• Monotube design increases handling performance over standard twin-tube shocks
• Floating piston separates gas and oil to prevent aeration and hydraulic fade
• Instant, automatic adjustment to driving conditions for improved cornering stability
• Seamless cylinder and heavy-duty seals for long-term durability under pressure
• Maintains consistent performance for vehicles equipped with early electronic safety systems
• Manufacturer Part Number: KG4550

Fits 1984-1992 BMW 318i, 318is, 325, 325e, 325i, 325is, 325iX, and M3 models.

The KYB Gas-A-Just is a high-performance monotube shock absorber designed to restore and exceed your BMW's original handling characteristics. Unlike standard twin-tube shocks, the Gas-A-Just utilizes two separate working chambers to provide more responsive control. The air-free hydraulic piston area maintains consistent damping, while a second high-pressure nitrogen gas chamber with a floating piston reacts instantly to road conditions, ensuring a stable ride during normal driving and aggressive performance on demand.

This monotube design effectively eliminates aeration and foaming, a common cause of performance fade in lesser shocks. For a complete suspension refresh and to minimize noise or vibration, KYB recommends pairing this shock with new strut mounts (part number: SM5013).

• Manufacturer Part Number: KG4539
• Position: Rear
• Design: Monotube high-pressure nitrogen gas
• Construction: Separate hydraulic and gas chambers with floating piston
• Benefits: Eliminates performance fade, increases responsiveness, and restores OE ride quality

Fits 1984-1987 Pontiac Fiero models including Base, GT, SE, Sport, and Value Leader.

The KYB Gas-A-Just (KG4538) is a high-pressure monotube shock absorber designed to restore or exceed the original handling capabilities of your vehicle. Unlike standard twin-tube designs, the Gas-A-Just features a completely separate hydraulic piston and valve area from the high-pressure nitrogen gas chamber. A floating piston keeps the oil and gas apart, which eliminates aeration and foaming to maintain consistent damping performance even under heavy use.

This responsive design provides a comfortable ride during normal cruising but reacts instantly to road inputs for increased control and stability. By restoring factory-level suspension performance, it also helps ensure that critical electronic safety systems, such as ABS and stability control, operate as originally intended.

• Manufacturer Part Number: KG4538
• Position: Front
• Internal Design: Monotube
• High-pressure nitrogen gas charge with floating piston
• Eliminates performance-robbing aeration and fluid foaming
• Seamless cylinder for maximum durability and sealing

Fits 1984-1987 Chevrolet Corvette Base and Indianapolis 500 Pace Car.

The KYB Gas-A-Just KG4537 is a high-pressure monotube shock absorber engineered to restore the original handling and control characteristics of the C4 Corvette suspension. Unlike conventional twin-tube shocks, the Gas-A-Just uses a specialized monotube design with two separate working chambers. An air-free hydraulic piston and valve area ensure immediate responsiveness, while a secondary high-pressure nitrogen gas chamber with a floating piston eliminates aeration and provides consistent damping during performance driving.

• Direct OE replacement designed to restore factory-level damping and stability
• High-pressure nitrogen gas charge and floating piston for instant response to road inputs
• Monotube construction eliminates performance fade by preventing oil foaming and aeration
• Maintains the necessary tire-to-road contact required for reliable electronic safety system operation
• Sold individually; recommended to be replaced in pairs
• Manufacturer Part Number: KG4537

Fits select 1952-2002 Ford Mustang, Thunderbird, Mercury Capri, Cougar, and various Volkswagen models including the Beetle and Transporter. Specifically designed for Ford 8.8-inch rear axle applications requiring a quad shock setup.

The KYB Gas-a-just Monotube shock absorber is engineered to provide higher damping performance than standard twin-tube designs. By utilizing a high-pressure nitrogen gas charge and a floating piston, the Gas-a-just series eliminates performance fade caused by aeration. This design allows for instant, automatic adjustment to driving conditions, providing a firm, controlled ride during spirited driving while maintaining comfort during highway cruising.

• Monotube Design: Features a single working cylinder for higher performance and better heat dissipation than twin-tube shocks.
• Dual Working Chambers: Separates the air-free hydraulic piston area from the high-pressure nitrogen gas chamber with a floating piston for consistent response.
• Damping Stability: Eliminates aeration and foaming to ensure the shock maintains performance under heavy loads or rapid cycling.
• Chassis Control: Restores original equipment handling capabilities and supports the performance of electronic safety systems.
• Manufacturer Part Number: KG4521

Fits 1966-1977 Volkswagen Beetle, Karmann Ghia, and Thing models.

The KYB Gas-a-just front monotube shock absorber (KG4520) provides a significant performance upgrade over standard twin-tube designs. By utilizing a high-pressure nitrogen gas charge and a floating piston design, this shock automatically adjusts to road conditions, delivering instant response and consistent damping without the risk of aeration-induced fade.

Constructed with two separate working chambers, the KYB Gas-a-just maintains an air-free hydraulic piston area for precise control while a second high-pressure gas chamber provides a comfortable ride during normal cruising and increased stability during spirited driving. This monotube design ensures your classic Volkswagen's suspension remains responsive, keeping tire contact patches stable and braking performance predictable.

• Manufacturer Part Number: KG4520
• Series: Gas-A-Just
• Design: Monotube high-pressure gas
• Position: Front
• Construction: Floating piston separates nitrogen gas and hydraulic fluid to eliminate aeration
• Compatibility: Replaces factory front shocks on select 1966-1977 VW models

Fits select 1964-1977 Bricklin SV-1, Ford Maverick, Ford Mustang, Mercury Comet, and Mercury Cougar.

The KYB Gas-A-Just monotube shock absorber is engineered to provide significantly higher damping performance than traditional twin-tube designs. It features a high-pressure nitrogen gas charge and a floating piston to prevent fluid aeration and foaming, effectively eliminating shock fade during spirited driving or harsh road conditions.

Built with two distinct working chambers—an air-free hydraulic piston area for immediate responsiveness and a separate gas chamber for support—this shock automatically adjusts to your performance needs. It provides the firm control necessary for modern handling standards while maintaining a comfortable ride during normal cruising. This is a critical component for ensuring that the suspension, braking, and tires work in harmony as the vehicle manufacturer intended.

• Manufacturer Part Number: KG4517
• Position: Front
• Internal Design: Monotube
• Components: High-pressure nitrogen gas and floating piston
• Performance: Instant automatic adjustment with zero aeration fade

Fits select 1956-1996 Buick, Cadillac, Chevrolet, Edsel, Ford, Oldsmobile, and Pontiac models.

The KYB Gas-a-Just monotube shock absorber is a high-pressure nitrogen gas upgrade designed to provide more consistent handling and control than standard twin-tube shocks. Featuring a completely air-free hydraulic chamber, this monotube design eliminates aeration and performance fade even under demanding driving conditions. The internal floating piston separates the oil and gas chambers, instantly adjusting to road conditions to maintain tire contact and steering response.

• Responsive Handling: Monotube design provides higher damping rates and faster reaction times than OE twin-tube shocks.
• Fade-Free Performance: The high-pressure nitrogen gas charge and floating piston prevent oil foaming and aeration.
• Durable Construction: Features a seamless working cylinder and a phenolic piston seal to maintain a consistent seal under varying temperatures.
• Safety System Support: Restores the damping characteristics required for proper operation of electronic safety systems like ABS and stability control.
• MPN: KG4515

Fits select 1968-1991 Avanti II, Buick, Cadillac, Chevrolet, GMC, Oldsmobile, and Pontiac models.

The KYB Gas-a-just KG4513 is a high-pressure monotube shock absorber designed to deliver superior control and responsiveness over traditional twin-tube designs. By utilizing a single-cylinder configuration and a floating piston, this shock eliminates aeration and prevents performance fade during intense driving conditions. The Gas-a-just automatically adjusts to road inputs, keeping tires planted for improved braking stability and steering precision.

• Monotube design provides instant response and consistent damping performance
• High-pressure nitrogen gas area with a floating piston eliminates fluid foaming
• Separate hydraulic and gas chambers prevent aeration-related fade
• Engineered to help maintain original electronic safety system performance
• Position: Front
• Manufacturer Part Number: KG4513

Fits select 1962-1974 Dodge and Plymouth vehicles, including Challenger, Charger, Coronet, Barracuda, Cuda, and Road Runner.

The KYB Gas-a-just is a high-pressure monotube shock absorber designed to restore or exceed the original handling and control capabilities of your classic Mopar. Unlike standard twin-tube shocks, the Gas-a-just features a completely separate hydraulic working chamber and a high-pressure nitrogen gas chamber divided by a floating piston. This design eliminates performance-robbing aeration and foaming, ensuring consistent damping even during aggressive driving or over rough surfaces.

• Monotube design provides higher performance and quicker response than standard twin-tube shocks.
• Seamless working cylinder and heavy-duty seals minimize the risk of fluid leaks or structural splitting.
• High-pressure nitrogen gas charge and floating piston prevent fade by keeping oil and gas separated.
• Restores factory-designed suspension geometry performance, supporting modern tire and braking system efficiency.
• Direct-fit OE replacement for front suspension mounting points.
• Manufacturer Part Number: KG4510

Vehicle Fitment

Fits select 1956-1995 Dodge, Honda, Plymouth, Saab, Suzuki, and Volvo models (including Civic, Samurai, and Colt).

The KYB Gas-A-Just KG4006 is a high-performance monotube shock absorber engineered to provide significantly better responsiveness and control than traditional twin-tube designs. Built for drivers who demand consistent handling, the Gas-A-Just automatically adjusts to road conditions, ensuring the vehicle remains stable even during spirited driving or heavy load transitions.

• Monotube Technology: Features a high-pressure nitrogen gas charge and a floating piston to prevent oil aeration and performance fade.
• Dual Working Chambers: Uses separate hydraulic and gas areas to provide immediate damping response and a firm, controlled ride.
• Safety System Support: Restores the suspension performance necessary for vehicle safety systems, including ABS and electronic stability control, to operate as intended.
• Premium Construction: Designed as a direct-fit replacement for the rear suspension, using OE-quality seals and mounting hardware to ensure long-term durability.

Each unit is a high-pressure nitrogen gas monotube shock. Manufacturer Part Number: KG4006.

Fits 1960-1980 Triumph GT6, Herald, and Spitfire models.

The KYB Gas-A-Just (KG3198) is a high-performance monotube shock absorber engineered to restore the original handling and control of your classic Triumph. As a monotube replacement, it offers a significant performance advantage over standard twin-tube shocks by eliminating aeration and foaming, ensuring consistent damping even under heavy use.

This shock features two distinct working chambers: an air-free hydraulic piston and valve area for immediate response, and a high-pressure nitrogen gas chamber with a floating piston. This design allows the shock to provide a compliant ride during normal driving while delivering instant, firm control on demand. It is a critical component for maintaining the effectiveness of the vehicle's braking and suspension geometry.

• Monotube Design: High-pressure nitrogen gas and floating piston prevent performance fade.
• OE Replacement: Engineered to restore factory-specified handling and steering responsiveness.
• Build Quality: Manufactured to exacting tolerances for a precise fit on classic Triumph rear suspensions.
• Part Number: KG3198
• Position: Rear

Fits 1988-1989 Toyota Celica (All Trac, GT, GTS, ST) and 1991-1995 Toyota MR2 (Base, Turbo).

KYB AGX manually-adjustable struts allow performance enthusiasts to tune their damping rates to match specific driving conditions. Designed for those who demand more control than standard OE replacements can provide, these struts feature velocity-sensitive damping valves that react instantly to road surfaces to maintain tire contact and chassis stability. Depending on the application, the AGX uses either an eight-position knob or a four-position screwdriver slot to adjust both rebound and compression damping simultaneously.

• Manual damping adjustment increases rates up to 125% over the vehicle's OEM design
• On-car adjustment requires no special tools for quick tuning between street and track
• Velocity-sensitive valving maintains ride quality while enhancing cornering performance
• Finished in signature AGX silver for long-term corrosion resistance
• Manufacturer Part Number: 765015
• Compatible with KYB Strut Boot part number SB103 (sold separately)

Fits 1982-2002 Chevrolet Camaro and Pontiac Firebird models, including Z28, SS, Iroc-Z, Formula, and Trans Am.

The KYB AGX manually adjustable gas shock allows enthusiasts to fine-tune their suspension damping without specialized tools or vehicle lifts. Designed for the 1982-2002 GM F-Body platform, these shocks provide a significant performance upgrade over factory units, offering up to 125% more damping force than the original equipment design. Whether you are prepping for a track day or adjusting for daily street comfort, the AGX series provides on-the-car damping control to match your driving conditions.

Each shock features velocity-sensitive damping valves that react instantly to road surfaces to maintain consistent tire contact. The single-dial adjustment system simultaneously changes both rebound and compression damping, ensuring a balanced response throughout the shock stroke. These units are engineered to be fully compatible with factory electronic safety systems, including ABS and ESC.

• Manufacturer Part Number: 743019
• Series: AGX Manually Adjustable
• Location: Rear
• Adjustment Type: 8-position knob or 4-position screwdriver slot (application specific)
• Damping Style: Velocity-sensitive valves with simultaneous rebound/compression adjustment
• Compatibility: Engineered for vehicles with factory ESC and ABS systems

Fits 2000-2005 Toyota Celica GT and GTS.

The KYB AGX series is designed for enthusiasts who demand the ability to tune their suspension for different driving conditions. These manually adjustable rear shocks allow you to dial in your damping rates without specialized tools, making it easy to transition from daily street driving to track-day performance. By adjusting a single external knob or screwdriver slot, the AGX simultaneously modifies both rebound and compression damping to provide up to a 125% increase in damping force over the factory OE design.

Built with velocity-sensitive damping valves, these units instantly react to road surface changes to maintain consistent tire contact and improve chassis control. Whether you are correcting for lowered springs or seeking more aggressive cornering response, the KYB AGX 741041 provides the versatility needed for high-performance applications.

• Manufacturer Part Number: 741041
• Adjustment Type: Manual multi-position (knob or screwdriver slot depending on accessibility)
• Valving: Velocity-sensitive for immediate response
• Compatibility: Replaces factory rear units on 7th Generation Celica models
• Hardware: Uses factory mounting points for a direct-bolt installation
• Maintenance Note: Recommended for use with KYB Strut Boot SB108 to protect the piston rod from debris

Fits 1990-1996 Nissan 300ZX Base, Turbo, and 2+2 models.

The KYB AGX Series manually-adjustable shocks allow you to tune your suspension damping to match your driving style without the need for specialized tools. Designed for enthusiasts who demand more than factory units can provide, these shocks offer a significant performance upgrade, allowing for damping rates up to 125% firmer than the original equipment. The velocity-sensitive valving reacts instantly to road inputs, maintaining maximum tire contact and vehicle stability on both the street and the track.

• Manufacturer Part Number: 741028
• Position: Rear
• Series: AGX
• Adjustment: External dial or screwdriver slot for easy damping changes
• Valving: Velocity-sensitive for immediate response to road conditions
• Tuning: Single adjustment modifies both rebound and compression damping
• Fitment: Direct replacement for factory rear shocks

For optimal protection against road salt, dirt, and debris, KYB recommends installing these with strut boot part number SB108.

Fits 1990-1996 Nissan 300ZX Base, 2+2, and Turbo models.

The KYB AGX series is designed for enthusiasts who demand the ability to tune their suspension performance on the fly. These manually adjustable struts allow you to modify damping rates without specialized tools, making it easy to transition from daily driving to track-focused setups. By utilizing a single adjustment point, the AGX simultaneously increases both rebound and compression damping to maintain tire contact and vehicle stability.

• Front Left position
• Manual adjustment increases damping rates up to 125% over the factory OEM design
• Velocity-sensitive damping valves react instantly to road and driving conditions
• External adjustment knob or screwdriver slot for rapid tuning without strut removal
• Recommended for use with KYB Strut Boot SB101 to protect against debris and salt
• Manufacturer Part Number: 741027

Fits 1990-1996 Nissan 300ZX (Base, 2+2, and Turbo models).

The KYB AGX manually adjustable strut allows enthusiasts to tune suspension damping on the fly without specialized tools. Designed to bridge the gap between street comfort and track performance, the AGX series provides an external adjustment interface (either a multi-position knob or screwdriver slot depending on application) to increase corner damping rates by up to 125% over the factory OEM design. This single adjustment point simultaneously modifies both rebound and compression damping to maintain balanced vehicle control.

• Velocity-Sensitive Valving: Internal valves instantly react to road inputs to ensure consistent tire contact and stability under high-demand driving conditions.
• Manual Control: Provides external access to damping settings, allowing for quick transitions between street driving and track use.
• Direct Fitment: Engineered as a high-performance alternative to standard OE replacements for the front right position.
• Protective Maintenance: For maximum service life, KYB recommends installation with a new strut boot (Part Number: SB101) to shield the piston rod from dirt and road salt.
• Manufacturer Part Number: 741026

Fits 1986-1991 Mazda RX-7 models including Turbo, GXL, GTU, and Convertible.

The KYB AGX manually-adjustable shock absorber allows you to tune your suspension damping without specialized tools. Designed for enthusiasts, the AGX series provides the flexibility to increase corner damping rates by up to 125% over the original equipment (OE) design, making it a professional-grade solution for both street performance and track days.

• Manual Adjustment: Features an external knob or screwdriver slot for quick changes to both rebound and compression damping simultaneously.
• Velocity-Sensitive Valving: Responds instantly to road conditions to maintain tire contact and vehicle stability.
• On-Vehicle Tuning: Adjust your ride quality and handling characteristics as often as needed to match driving conditions or track requirements.
• Durability: Engineered for demanding conditions that exceed the capabilities of standard OE replacement parts.
• Part Protection: Compatible with KYB Strut Boot SB107 (sold separately) to protect the piston rod from dirt and debris.

Specifications:
Manufacturer Part Number: 741025
Position: Rear

Fits 1989-1994 Nissan 240SX Base, LE, SE, and XE models.

The KYB AGX series is designed for enthusiasts who demand the ability to tune their suspension for specific driving conditions. These manually-adjustable rear shocks allow you to dial in damping rates up to 125% firmer than the factory OE design without the need for specialized tools. Whether you are prepping for a track day or adjusting for daily street comfort, the AGX system provides a single-point adjustment that simultaneously increases both rebound and compression damping.

Built with velocity-sensitive damping valves, these shocks instantly react to road inputs to maintain consistent tire contact and chassis control. Depending on the specific configuration, these units feature either an external eight-position knob or a four-position screwdriver slot for rapid adjustments on the vehicle.

• Adjustable damping rates for street or track performance
• Velocity-sensitive valving for improved vehicle stability
• Increases damping up to 125% over original equipment
• Single adjustment point controls rebound and compression
• Compatible with KYB Strut Boot SB108 (sold separately)
• Manufacturer Part Number: 741017