KYB Gas-a-Just Monotube Shock Absorber KG4521 for Volkswagen Beetle and Transporter

The KYB Gas-a-just monotube shock absorber has additional performance advantages over the traditional twin-tube design: It can instantly, automatically adjust to your performance needs and never experiences fade due to aeration. The KYB Gas-a-just has two separate working chambers: An air-free hydraulic piston and valve area for responsiveness and control, and a second high-pressure nitrogen gas area with a floating piston that provides a comfortable ride during normal driving and adds instant performance on demand.

• Electronic safety systems depend on the suspension, brakes and tires operating as the vehicle manufacturer intended. The KYB Gas-a-just helps keep Electronic Safety Systems performing as designed.

The KYB Gas-a-Just KG4521 monotube shock absorber is engineered to provide responsive handling, consistent control, and improved suspension performance for select Volkswagen Beetle and Transporter applications. Its monotube design uses separate working chambers to maintain stable damping performance and help reduce the effects of aeration during demanding driving conditions.

Inside the KYB Gas-a-Just, an air-free hydraulic piston and valve area supports precise suspension control, while a high-pressure nitrogen gas chamber with a floating piston allows the shock to respond automatically to changing road and driving conditions. This design helps provide a comfortable ride during normal driving and additional damping performance when vehicle movement increases. By helping the suspension operate as intended, the KYB Gas-a-Just also supports the proper function of electronic safety systems that depend on the vehicle’s suspension, brakes, and tires.

Key Product Specifications & Technical Data

• Brand: KYB
• Part Number: KG4521
• Product Type: Monotube shock absorber
• Series: Gas-a-Just
• Construction: Monotube design with floating piston
• Gas Charge: High-pressure nitrogen
• Application Type: Automotive suspension replacement
• Air Freight: Prohibited

What's Included

• One KYB Gas-a-Just KG4521 shock absorber

Fitment

Designed for select 1952–1953 Volkswagen Beetle and 1964–1969 Volkswagen Transporter applications. Verify vehicle year, model, suspension position, and application details before ordering. This part is intended for the listed fitments and may not apply to every configuration.

Features:

• Monotube Performance: Uses a monotube design to provide consistent damping and responsive suspension control.
• Automatic Damping Adjustment: Adjusts quickly to changing road and driving conditions for improved handling performance.
• Fade Resistance: Separate hydraulic and gas chambers help prevent performance loss caused by aeration.
• Electronic Safety Support: Helps the suspension operate as intended so electronic safety systems can perform according to the vehicle manufacturer’s design.

Fitments:
1952 Volkswagen Beetle Base
1952 Volkswagen Beetle Deluxe
1953 Volkswagen Beetle Base
1953 Volkswagen Beetle Deluxe
1954 Volkswagen Beetle Base
1954 Volkswagen Beetle Deluxe
1955 Volkswagen Beetle Base
1955 Volkswagen Beetle Deluxe
1955 Volkswagen Karmann Ghia Base
1955 Volkswagen Transporter Base
1956 Volkswagen Beetle Base
1956 Volkswagen Beetle Deluxe
1956 Volkswagen Karmann Ghia Base
1956 Volkswagen Transporter Base
1957 Volkswagen Beetle Base
1957 Volkswagen Beetle Deluxe
1957 Volkswagen Karmann Ghia Base
1957 Volkswagen Transporter Base
1958 Volkswagen Beetle Base
1958 Volkswagen Beetle Deluxe
1958 Volkswagen Karmann Ghia Base
1958 Volkswagen Transporter Base
1959 Volkswagen Beetle Base
1959 Volkswagen Beetle Deluxe
1959 Volkswagen Karmann Ghia Base
1959 Volkswagen Transporter Base
1960 Volkswagen Beetle Base
1960 Volkswagen Beetle Deluxe
1960 Volkswagen Karmann Ghia Base
1960 Volkswagen Transporter Base
1961 Volkswagen Beetle Base
1961 Volkswagen Beetle Deluxe
1961 Volkswagen Karmann Ghia Base
1961 Volkswagen Transporter Base
1962 Volkswagen Beetle Base
1962 Volkswagen Beetle Deluxe
1962 Volkswagen Karmann Ghia Base
1962 Volkswagen Transporter Base
1963 Volkswagen Beetle Base
1963 Volkswagen Beetle Deluxe
1963 Volkswagen Karmann Ghia Base
1963 Volkswagen Transporter Base
1964 Volkswagen Beetle Base
1964 Volkswagen Karmann Ghia Base
1964 Volkswagen Transporter Base
1965 Volkswagen Beetle Base
1965 Volkswagen Karmann Ghia Base
1965 Volkswagen Transporter Base
1966 Volkswagen Beetle Base
1966 Volkswagen Fastback Base
1966 Volkswagen Squareback Base
1966 Volkswagen Transporter Base
1967 Volkswagen Fastback Base
1967 Volkswagen Squareback Base
1967 Volkswagen Transporter Base
1968 Volkswagen Campmobile Base
1968 Volkswagen Fastback Base
1968 Volkswagen Squareback Base
1968 Volkswagen Transporter Base
1969 Volkswagen Campmobile Base
1969 Volkswagen Fastback Base
1969 Volkswagen Squareback Base
1969 Volkswagen Transporter Base
1970 Volkswagen Campmobile Base
1970 Volkswagen Fastback Base
1970 Volkswagen Squareback Base
1970 Volkswagen Transporter Base
1971 Volkswagen Campmobile Base
1971 Volkswagen Fastback Base
1971 Volkswagen Squareback Base
1971 Volkswagen Transporter 211
1971 Volkswagen Transporter 215
1971 Volkswagen Transporter 261
1971 Volkswagen Transporter 265
1971 Volkswagen Transporter Base
1972 Volkswagen Campmobile Base
1972 Volkswagen Fastback Base
1972 Volkswagen Squareback Base
1972 Volkswagen Transporter 211
1972 Volkswagen Transporter 215
1972 Volkswagen Transporter Base
1973 Volkswagen Campmobile Base
1973 Volkswagen Fastback Base
1973 Volkswagen Squareback Base
1973 Volkswagen Transporter 211
1973 Volkswagen Transporter 215
1973 Volkswagen Transporter Base
1974 Volkswagen Campmobile Base
1974 Volkswagen Transporter 211
1974 Volkswagen Transporter Base
1975 Volkswagen Transporter Base
1975 Volkswagen Transporter Campmobile
1975 Volkswagen Transporter Kombi
1976 Volkswagen Transporter Base
1976 Volkswagen Transporter Campmobile
1976 Volkswagen Transporter Kombi
1977 Volkswagen Transporter Base
1977 Volkswagen Transporter Campmobile
1977 Volkswagen Transporter Kombi
1978 Volkswagen Transporter Base
1978 Volkswagen Transporter Campmobile
1978 Volkswagen Transporter Kombi
1979 Volkswagen Transporter Base
1979 Volkswagen Transporter Campmobile
1979 Volkswagen Transporter Kombi
1984 Ford Mustang GT
1984 Ford Mustang GT-350 20th Anniversary
1984 Ford Mustang L
1984 Ford Mustang LX
1984 Ford Mustang SVO
1984 Ford Thunderbird Base
1984 Ford Thunderbird Elan
1984 Ford Thunderbird Fila
1984 Ford Thunderbird LX
1984 Ford Thunderbird Sport
1984 Ford Thunderbird Turbo
1984 Mercury Capri GS
1984 Mercury Capri RS
1984 Mercury Capri RS Turbo
1984 Mercury Cougar Base
1984 Mercury Cougar LS
1984 Mercury Cougar XR-7
1985 Ford Mustang GT
1985 Ford Mustang LX
1985 Ford Mustang SVO
1985 Ford Thunderbird Base
1985 Ford Thunderbird Elan
1985 Ford Thunderbird Fila
1985 Ford Thunderbird LX
1985 Ford Thunderbird Sport
1985 Ford Thunderbird Turbo
1985 Mercury Capri GS
1985 Mercury Capri RS
1985 Mercury Cougar Base
1985 Mercury Cougar LS
1985 Mercury Cougar XR-7
1986 Ford Mustang GT
1986 Ford Mustang LX
1986 Ford Mustang SVO
1986 Ford Thunderbird Base
1986 Ford Thunderbird Elan
1986 Ford Thunderbird LX
1986 Ford Thunderbird Sport
1986 Ford Thunderbird Turbo
1986 Mercury Capri 5.0
1986 Mercury Capri GS
1986 Mercury Cougar Base
1986 Mercury Cougar LS
1986 Mercury Cougar XR-7
1987 Ford Mustang GT
1987 Ford Mustang LX
1987 Ford Thunderbird Base
1987 Ford Thunderbird LX
1987 Ford Thunderbird Sport
1987 Ford Thunderbird Turbo
1987 Mercury Cougar LS
1987 Mercury Cougar XR-7
1988 Ford Mustang GT
1988 Ford Mustang LX
1988 Ford Thunderbird Base
1988 Ford Thunderbird LX
1988 Ford Thunderbird Sport
1988 Ford Thunderbird Turbo
1988 Mercury Cougar LS
1988 Mercury Cougar XR-7
1989 Ford Mustang GT
1989 Ford Mustang LX
1990 Ford Mustang GT
1990 Ford Mustang LX
1991 Ford Mustang GT
1991 Ford Mustang LX
1992 Ford Mustang GT
1992 Ford Mustang LX
1993 Ford Mustang GT
1993 Ford Mustang LX
1993 Ford Mustang SVT Cobra
1993 Ford Mustang SVT Cobra R
1994 Ford Mustang Base
1994 Ford Mustang GT
1994 Ford Mustang SVT Cobra
1995 Ford Mustang Base
1995 Ford Mustang GT
1995 Ford Mustang GTS
1995 Ford Mustang SVT Cobra
1995 Ford Mustang SVT Cobra R
1996 Ford Mustang Base
1996 Ford Mustang GT
1996 Ford Mustang SVT Cobra
1997 Ford Mustang Base
1997 Ford Mustang GT
1997 Ford Mustang SVT Cobra
1998 Ford Mustang Base
1998 Ford Mustang GT
1998 Ford Mustang SVT Cobra
1999 Ford Mustang Base
1999 Ford Mustang GT
1999 Ford Mustang SVT Cobra
2000 Ford Mustang Base
2000 Ford Mustang GT
2000 Ford Mustang SVT Cobra R
2001 Ford Mustang Base
2001 Ford Mustang GT
2001 Ford Mustang GT Bullitt
2001 Ford Mustang SVT Cobra
2002 Ford Mustang Base
2002 Ford Mustang GT

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1