KYB 551132 Suspension Strut - Rear

KYB Gas-a-Just Rear Strut for Lexus IS250 and IS350

KYB Gas-a-Just 551132 is a rear suspension strut built as an OE-style monotube replacement for select Lexus IS models. It is engineered to restore original ride control, steering response, and suspension stability on vehicles that see daily driving, towing loads, or heavier wheel and tire setups.

Key Features

• Monotube OE replacement design for direct suspension service
• Separate gas and oil chambers for consistent damping and quick response
• High-pressure nitrogen gas construction for fade-resistant operation
• Triple chrome plated piston rod to reduce seal wear and fluid leakage
• Internal rebound spring for controlled suspension movement
• Rear application for 2006-2013 Lexus IS250 and 2006-2013 Lexus IS350
• Part number 551132 for easy identification and ordering

Product Details

The KYB Gas-a-Just line is designed for drivers who want a monotube strut that restores factory handling characteristics without changing the vehicle’s suspension layout. Part number 551132 uses a high-pressure monotube design with an air-free hydraulic working area and a separate nitrogen gas chamber, helping maintain responsive damping during normal driving and under heavier suspension demand. This rear strut is a direct fit for 2006-2013 Lexus IS250 rear and 2006-2013 Lexus IS350 rear applications. This part cross-references Monroe Shocks & Struts 39133 for the same application.

Common Problems This Strut Can Address

• Excessive rear-end bounce or oscillation
• Reduced steering response and body control
• Fluid leakage from a worn strut assembly
• Uneven ride quality after suspension wear
• Loss of damping performance with heavier wheels or tires

Installation Notes and Tips

Fits 2006-2013 Lexus IS250, rear. Fits 2006-2013 Lexus IS350, rear. Replace the suspension strut and coil spring assembly according to the manufacturer’s instructions. Verify mount style and dimensions before installation: compressed length 16.96 in, extended length 21.92 in, stroke length 4.96 in, lower mount type E2(14.2x60), upper mount type 12x1.25. Dust cover is not included.

Quality Assurance

KYB manufactures Gas-a-Just as an OE monotube replacement to help restore the vehicle’s original suspension behavior. The design supports consistent damping, reduced seal wear, and stable operation for systems that rely on the suspension performing as engineered.