Bilstein 47-311039 Suspension Kit - Front

Bilstein B8 6112 Suspension Kit Overview

The Bilstein B8 6112 suspension kit (part number 47-311039) is engineered for Lexus and Toyota light trucks, including the 4Runner, FJ Cruiser, and GX460. Designed to enhance vehicle handling and ride quality, this kit features a monotube internal design and a snap ring grooved coilover body for reliable performance.

• Monotube internal design for consistent damping
• Snap ring grooved body (coilover) construction
• Front main spring rate of 700 lbs/in for improved load handling
• Stroke/travel length of 4.79 inches (121.7 mm)
• Collapsed length of 16.86 inches (428.3 mm) and extended length of 21.65 inches (550 mm)
• 60mm piston diameter and 18mm shaft diameter for durability
• Zinc plated dampers with black springs finish
• Spring seat included for secure installation

Detailed Product Description

This Bilstein B8 6112 suspension kit is designed specifically for light trucks such as the Lexus GX460 and Toyota 4Runner and FJ Cruiser models. The monotube shock absorber design provides consistent damping performance by allowing better heat dissipation and reducing fade during extended use. The snap ring grooved coilover body ensures secure spring placement and easy adjustment. With a front main spring rate of 700 lbs/in, this kit supports heavier loads and improves vehicle stability under various driving conditions.

The kit features a piston diameter of 60mm and a shaft diameter of 18mm, contributing to its robust construction. The stroke length of 4.79 inches allows for adequate suspension travel, balancing comfort and control. Finished with zinc plated dampers and black springs, the components resist corrosion and maintain durability over time. The included spring seat ensures proper spring positioning and secure fitment.

About the B8 6112 Product Line

The Bilstein B8 6112 series is tailored for light truck applications, focusing on coilover-style suspension kits that combine monotube shock technology with high spring rates. This product line is engineered to provide enhanced handling and load capacity for vehicles like the Lexus GX460 and Toyota 4Runner and FJ Cruiser, making it suitable for both on-road and moderate off-road use.

Common Applications and Problem Solving

• Improves handling and stability on rough or uneven terrain
• Reduces body roll during cornering and heavy load conditions
• Restores suspension travel and ride height for lifted or modified vehicles
• Enhances load carrying capacity for towing or hauling
• Addresses worn or fatigued factory shocks and springs

Installation Notes and Tips

Installation of the Bilstein B8 6112 suspension kit (part number 47-311039) requires basic suspension knowledge and appropriate tools. The kit includes spring seats but does not come with boots or reservoirs. Ensure the vehicle is securely lifted and supported before removing factory components. Verify spring orientation and preload settings during assembly to maintain proper suspension geometry. It is recommended to have a professional alignment performed after installation to optimize handling and tire wear.

Quality Assurance and Warranty

Bilstein suspension components are manufactured to meet strict quality standards, utilizing durable materials and advanced engineering. The B8 6112 suspension kit undergoes rigorous testing to ensure consistent performance and longevity. Warranty details are provided by Bilstein and typically cover defects in materials and workmanship under normal use. Consult the manufacturer’s warranty documentation for specific terms and conditions.