Bilstein CA4 Series Shock Absorber - Polished Aluminum

 

Bilstein CA4 Series Shock Absorber is made for custom suspension builders who need a performance shock absorber that can be matched to the chassis rather than forced into a one-size setup. The polished aluminum threaded-body design gives the shock a clean, purpose-built appearance, while the available lengths and valve settings help support the ride and handling target of the build. It is a strong choice for customers working on street rod, motorsports, and specialty suspension applications where careful measurement matters.

The shock uses Bilstein monotube technology to help manage heat and maintain consistent damping as the suspension works. A 46mm piston gives the damper the control needed for custom applications, and the selected valve setting shapes how the vehicle responds to compression, rebound, and terrain changes. Customers can build around the specific motion control their project needs instead of settling for generic damping.

The CA4 uses 5/8 inch polyurethane bushing mounts and is supplied with a hard anodized spring seat, lock ring, and hat for a 2.5 inch ID spring. That mounting style helps the shock integrate into custom chassis layouts while preserving the precision needed for a clean suspension cycle. Because compressed length, extended length, and travel vary by selected configuration, the installer should confirm measurements against the actual chassis before final setup.

The polished and finished body gives the shock a refined look that suits visible suspension areas on high-detail builds. More importantly, the construction supports repeatable movement through the suspension stroke, helping customers balance stance, ride quality, and body control. The shock is useful anywhere a custom vehicle needs compact packaging and reliable damping control.

Customers choosing a universal-style shock absorber usually have a specific target in mind: ride height, travel, wheel clearance, spring package, or the character of the vehicle over real roads. This shock gives those builders a Bilstein foundation with length and valving choices that can be matched to the project. It is best selected by measurement, mounting style, and the intended use of the vehicle.

Whether customers are upgrading for custom coilover packaging, street rod stance, and chassis-specific ride tuning, Bilstein CA4 Series Shock Absorber delivers custom-fit damping control with a polished performance look. Now Available at LEER!

 

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Features & Specifications

Product Type: Suspension shock absorber

Brand: Bilstein

Series: CA4 Series

Application: Custom street rod suspension builds

Internal Design: Monotube

Piston Diameter: 46mm

Body Design: Threaded body

Finish: Polished aluminum

Mounting: Eye 15.9mm upper and lower mounts

Spring Seat Included: Yes

Spring Hardware: Hard anodized spring seat, lock ring, and hat for 2.5 inch ID spring

Extended Length Range: 11.95 to 15.16 in.

Functionality:

• Supports custom coilover-style street rod setups
• Provides a threaded body for spring seat placement
• Includes spring hardware for 2.5 inch ID springs
• Uses monotube damping for consistent suspension control
• Offers multiple length and valving choices
• Helps builders tune ride height, spring package, and damping together
• Uses polyurethane bushing mounts for common custom chassis layouts

 

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Available Options

The Bilstein CA4 Series Shock Absorber is available in multiple configurations:

• Compact CA4 configurations -- Shorter extended-length options help solve tight street rod packaging needs.
• Longer CA4 configurations -- Longer extended-length options support builds that need additional suspension movement.
• Polyurethane bushing mount versions -- Eye-style bushing mounts help suit custom chassis brackets and street rod suspension layouts.
• Valve setting choices -- Compression and rebound selections allow the damping feel to be matched to vehicle weight, spring rate, and use.

Choose a compact configuration for tight packaging, or choose a longer configuration when the suspension design calls for more available travel.

 

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Why Choose

This product is ideal for customers who want a threaded Bilstein shock with spring hardware for custom street rod suspension setup.

• Supports a more complete coilover-style custom setup
• Lets builders coordinate ride height, spring selection, and damping control
• Polished aluminum construction gives exposed suspension a premium look
• Includes hardware for 2.5 inch ID spring use where supplied
• Multiple valving options help match the vehicle's weight and purpose
• Works well for customers building a chassis from measurements
• Provides Bilstein monotube control in a custom-friendly package

 

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What's Included

• One CA4 Series shock absorber
• Hard anodized spring seat
• Lock ring
• Spring hat for 2.5 inch ID spring
• Polyurethane bushing mounts where supplied
• Selected length and valve configuration

Note: Confirm included components before installation.

 

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Installation Notes

• Measure compressed length, extended length, spring clearance, and mounting width before ordering
• Confirm selected spring diameter, spring length, and spring rate with the chassis design
• Professional fabrication and suspension setup are recommended
• Verify that the spring and shock clear the chassis through full compression and extension

Buyer is responsible for use in accordance with applicable vehicle, road, off-road, towing, racing, and local laws.

 

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Warranty Information

Bilstein warranty coverage varies by product category and market. Customers should review the current Bilstein warranty documentation and retailer purchase record for eligibility, claim steps, and coverage duration before service or refreshment work begins.

Warranty coverage typically excludes improper installation, misuse, modifications, electrical issues, overloading, tampering, impact damage outside warranty terms, or non-compliant use; proof of purchase may be required for warranty claims.