Bilstein 36-281831 Coil Spring Set - Rear

Bilstein B12 Rear Coil Spring Set

Bilstein B12 (Special) suspension kits are built to change ride height for a specific performance need while maintaining balanced suspension behavior. This Bilstein coil spring set is finished in black and is made for rear applications on select Toyota 4Runner, Lexus GX460, and Toyota FJ Cruiser models with heavy-load or conversion requirements.

The B12 (Special) line focuses on combining suspension dynamics, quality, and appearance in one package. For buyers searching for a rear coil spring set for a 2003-2024 Toyota 4Runner, 2014-2023 Lexus GX460, or 2007-2014 Toyota FJ Cruiser, part number 36-281831 is the relevant Bilstein reference for these listed applications.

Key Features

• Bilstein B12 (Special) suspension series
• Rear coil spring application
• Black spring finish
• Built for ride-height changes tied to specific load and conversion needs
• Fits select Toyota 4Runner, Lexus GX460, and Toyota FJ Cruiser rear suspension applications
• Part number 36-281831 for catalog and fitment lookup

Fitment Details

• Fits 2003-2024 Toyota 4Runner, rear, Heavy Load PKG; 400 lb Constant Weight; B12 (Special)
• Fits 2014-2023 Lexus GX460, rear, Heavy Load PKG; 400 lb Constant Weight; B12 (Special)
• Fits 2007-2014 Toyota FJ Cruiser, rear, Heavy Load PKG; 400 lb Constant Weight; B12 (Special)
• Fits 2010-2013 Lexus GX460, rear, Requires Rear Coil Spring Conversion; B12 (Special)

What This Spring Set Helps Address

• Rear ride-height changes for heavy-load setups
• Rear suspension sag from constant cargo weight
• Replacement needs for B12 (Special) suspension configurations
• Rear coil spring conversion requirements on select Lexus GX460 models
• Fitment-specific suspension refreshes for Toyota 4Runner and Toyota FJ Cruiser rear applications

Installation Notes

Verify rear fitment by year, model, and notes before ordering. This part is listed for rear suspension use only, and the application notes include heavy-load package and conversion-specific requirements. Part number 36-281831 should be matched to the vehicle configuration exactly, especially on Lexus GX460 models that require rear coil spring conversion.

This part cross-references 826621 for the same application.

Quality Assurance

Bilstein B12 (Special) suspension kits are engineered around ride-height control, suspension dynamics, and consistent build quality. The B12 line is positioned for drivers who need a specific rear spring setup with a clean black finish and application-specific fitment.