KYB KG9307 Suspension Strut - Rear

KYB Gas-a-Just Rear Strut for BMW 5 Series

The KYB Gas-a-Just KG9307 is a rear suspension strut built as an OE-style monotube replacement for select BMW 5 Series applications. It is engineered to restore control, steering response, and ride consistency for vehicles that see daily driving, towing, or heavier wheel and tire setups.

Key Features

• Monotube design with separate gas and oil chambers for quick response and fade-resistant operation
• Up to 25% more damping performance than original equipment shocks
• High-pressure nitrogen gas helps improve steering response and control
• Triple chrome plated piston rod helps reduce seal wear and fluid leakage
• Built for BMW 5 Series rear suspension applications with application-specific valving
• Supports vehicles that work harder, tow, or run larger, heavier tires and wheels
• Includes B-stop and R-stop design features

Product Details

The KYB Gas-a-Just line is KYB’s monotube performance-oriented OE replacement series. On the KG9307, the air-free hydraulic working area delivers responsive damping, while the high-pressure nitrogen chamber adds immediate force when suspension demand increases. That design helps maintain consistent control during normal driving and under heavier load conditions. This part number, KG9307, is a direct-fit rear strut solution for select BMW 528e, 533i, 524td, 535i, 535is, and 635CSi models.

This part cross-references Monroe Shocks & Struts 71206 for the same application.

Used For

• Rear-end bounce, float, or reduced damping control
• Excessive body movement over bumps and uneven pavement
• Slower steering response caused by worn suspension damping
• Ride instability on BMW 5 Series models with heavier wheels and tires
• Restoring OE-style suspension behavior on aging rear strut assemblies

Installation Notes and Fitment

Compatible With 1985-1989 BMW 635CSi, rear; 1982-1988 BMW 528e, rear; 1988 BMW 535i, rear; 1988 BMW 535is, rear; 1985-1987 BMW 535i, rear; 1985-1986 BMW 524td, rear; and 1983-1984 BMW 533i, rear. Notes vary by application, including exclusions for Bilstein-equipped vehicles, electronic adjustable suspension, and certain M5 configurations. Verify mount type and compressed/extended length before installation: compressed length 13.98 in, extended length 21.5 in, stroke length 7.52 in. Lower mount type is E2(14X62) and upper mount type is S1. Dust cover is not included.

Quality Assurance

KYB designs the Gas-a-Just series as an OE monotube replacement with application-specific valving for the listed BMW 5 Series rear applications. The KG9307 uses a high-pressure monotube layout and a chrome piston rod to support consistent damping performance and reduced seal wear.