KYB KG5573 Shock Absorber - Rear

KYB Gas-a-Just Rear Shock KG5573

The KYB Gas-a-just KG5573 is a monotube rear shock absorber built to restore OE-style control on classic GM applications. It uses separate hydraulic and high-pressure gas chambers to deliver responsive damping, stable ride quality, and quicker reaction when road conditions change.

Compatible with 1979-1985 Buick Riviera rear, 1979-1985 Cadillac Eldorado rear, 1980-1985 Cadillac Seville rear, and 1979-1985 Oldsmobile Toronado rear, this shock is a direct-fit OE monotube replacement for vehicles that originally used air shocks.

Key Features

• Up to 25% more damping performance than original equipment shocks
• Monotube design separates gas and oil for fade-resistant operation and immediate response
• Higher gas pressure improves steering response and suspension control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Designed specifically for classic GM cars and heavier-duty driving demands
• Dust cover included
• Lower mount type: E2(12X41)
• Upper mount type: E2(12X57)
• Compressed length: 15.16 in; extended length: 22.44 in; stroke length: 7.28 in

Product Details

The Gas-a-just line is KYB’s performance-oriented monotube shock family, engineered as an OE replacement for vehicles that need firmer control without sacrificing normal ride comfort. KG5573 uses an air-free hydraulic working area for consistent damping, plus a separate nitrogen gas chamber with a floating piston to add pressure on demand. That design helps maintain control during braking, cornering, towing, and when larger or heavier wheels and tires are installed. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Excessive rear bounce after bumps or dips
• Reduced control from worn OEM air shocks
• Slow steering response and loose-feeling handling
• Shock fade during repeated suspension movement
• Fluid leakage caused by worn piston rod seals

Installation Notes

Fits 1979-1985 Buick Riviera, rear; 1979-1985 Cadillac Eldorado, rear; 1980-1985 Cadillac Seville, rear; and 1979-1985 Oldsmobile Toronado, rear. Verify mount style, compressed length, and extended length against the original shock before installation. This rear shock is listed as a recommended OEM replacement and eliminates OEM airshocks on the covered applications.

Quality Assurance

KYB designs Gas-a-just shocks as OE-style monotube replacements with application-specific valving for classic GM vehicles. The KG5573 is built to restore original suspension function while improving damping response and consistency.