KYB 343219 Shock Absorber - Rear

KYB Excel-G Rear Shock Absorber

The KYB Excel-G 343219 is a nitrogen gas-charged, twin-tube rear shock absorber built to restore original ride control, stability, and handling. It is an OE-style replacement for classic Ford and Mercury applications, including rear suspension service on the Mustang, Cougar, Montego, Colony Park, and Thunderbird.

Built on KYB OE assembly lines, the Excel-G line is calibrated to return the vehicle to its designed damping characteristics rather than change the ride feel. For rear suspension repair on a 1964-1973 Ford Mustang or 1955-1957 Ford Thunderbird, part number 343219 provides a direct replacement approach focused on control and alignment consistency.

Key Features

• KYB recommended OEM replacement shock
• Restores designed control, handling, and body motion management
• Triple-lip fluid seal helps reduce oil and gas leakage
• Vehicle-specific, hand-assembled damping valves manage tire contact and steering response
• Supports proper operation of electronic safety systems by maintaining suspension performance
• Strong, thick strut body and bracket construction helps minimize flex and maintain alignment
• Dust cover included

Product Details

The KYB Excel-G brand line is focused on OE replacement performance for drivers who want factory-correct damping characteristics. This rear shock absorber uses a twin-tube, nitrogen gas-charged design and OE-quality components to help return the suspension to its original response. Dimensions include a compressed length of 10.31 inches, extended length of 17.4 inches, and stroke length of 7.09 inches. Upper and lower mount types are S1.

This part cross-references Monroe Shocks & Struts 31069 and Gabriel 81270 for the same application. The KYB 343219 is a practical choice for rear suspension refresh work on Ford Mustang, Mercury Cougar, and related classic rear-shock applications where original ride control matters.

Common Problems This Part Can Address

• Excessive rear bounce after bumps
• Loose or unstable handling in lane changes
• Reduced tire contact and uneven road control
• Oil seepage or gas leakage from a worn shock absorber
• Rear suspension response that no longer matches factory behavior

Installation Notes and Tips

• Compatible With 1964-1973 Ford Mustang, rear.
• Compatible With 1967-1973 Mercury Cougar, rear.
• Compatible With 1968-1971 Mercury Montego, rear, excluding station wagon models.
• Compatible With 1957-1960 Mercury Colony Park, rear.
• Compatible With 1955-1957 Ford Thunderbird, rear.
• Replace suspension strut and coil spring assembly according to the manufacturer’s instructions where specified.
• Verify mount style and suspension configuration before installation.

Quality Assurance

KYB is a major OE shock and strut supplier, and the Excel-G line is produced on the same KYB OE assembly lines using OE-quality components. That manufacturing approach supports consistent fitment and damping performance for classic rear suspension service.