KYB KG5512 Shock Absorber - Rear

KYB Gas-a-just Rear Shock for Classic Mopars

KYB Gas-a-just KG5512 is a monotube rear shock absorber built for classic Chrysler and Dodge full-size cars that need firmer control than a standard twin-tube design. It is engineered for rear suspension applications on vehicles such as the Chrysler New Yorker, Newport, Town & Country, Imperial, 300, and Dodge Charger, Challenger, and Monaco.

The Gas-a-just line is tuned for drivers who want responsive damping, stable handling, and fade-resistant performance during normal cruising and harder use. This KG5512 shock uses a high-pressure monotube layout with separate gas and oil chambers for consistent response.

Key Features

• Monotube shock absorber design for direct response and consistent damping
• Up to 25% more damping performance than original equipment shocks
• High-pressure nitrogen gas chamber helps reduce fade from aeration
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed specifically for classic Mopar rear suspension applications
• Improves steering response and suspension control on heavier vehicles
• Dust cover included

Product Details

KYB Gas-a-just KG5512 uses an air-free hydraulic working chamber for control and a separate high-pressure gas chamber for quick reaction to road inputs. That design helps the shock maintain consistent damping on classic Chrysler and Dodge models, including rear applications on the 1965-1969 Chrysler 300 and Imperial, 1965-1978 Chrysler New Yorker and Newport, 1965-1970 Chrysler Town & Country, 1965-1976 Dodge Charger and Monaco, 1970-1974 Dodge Challenger, and 1977-1978 Dodge Monaco with police package. This part cross-references Monroe Shocks & Struts (e.g., 32073) for the same application.

Part number KG5512 is a fitment-based rear shock solution for drivers restoring or upgrading classic Mopar suspension performance. The Gas-a-just line is commonly selected for vehicles that work harder, tow, or run larger wheels and tires, where added damping control is important.

What It Helps Address

• Excessive rear-end bounce over uneven pavement
• Reduced damping control from worn OE shocks
• Shock fade caused by aeration during repeated suspension movement
• Loose or delayed steering response on heavier classic cars
• Loss of ride control on vehicles with larger, heavier tires and wheels

Installation Notes and Tips

Compatible With rear shock applications only. Verify compressed length 13.98 in., extended length 22.64 in., and stroke length 8.66 in. before installation. Lower mount type is E1L/E(17.5) and upper mount type is E2(12.8X41.3). This shock includes a dust cover, and the application notes should be followed for vehicles with special suspension equipment, including exclusions such as air suspension where listed.

For fitment, use the vehicle-specific listing: Fits 1965-1969 Chrysler 300, rear; Fits 1965-1969 Chrysler Imperial, rear; Fits 1965-1969 Chrysler Newport, rear; Fits 1965-1969 Chrysler New Yorker, rear; Fits 1965-1970 Chrysler Town & Country, rear; Fits 1965-1970 Dodge Monaco, rear; Fits 1966-1976 Dodge Charger, rear; Fits 1967-1969 Chrysler Imperial, rear; Fits 1970-1974 Dodge Challenger, rear; Fits 1972-1976 Dodge Monaco, rear; Fits 1974-1975 Chrysler Imperial, rear; Fits 1974-1978 Chrysler Newport, rear; Fits 1974-1978 Chrysler New Yorker, rear; Fits 1974-1978 Chrysler Town & Country, rear; Fits 1977-1978 Dodge Monaco, rear with police package.

Quality Assurance

KYB is a long-established suspension manufacturer with OE-level engineering focus. Gas-a-just shocks are built around a monotube design that separates gas and oil for stable operation and consistent damping performance in classic Chrysler and Dodge rear suspension applications.