What does the spring rate (400 lbs/in) mean for my vehicle's ride?

A 400 lbs/in spring rate means that for every inch the spring is compressed, it exerts 400 pounds of force. A higher spring rate like this generally results in a firmer ride and less body roll during cornering compared to a softer, stock spring.

What is the inner diameter of this coilover spring?

This FOX coilover spring has an inner diameter of 3 inches. It's important to ensure this matches the specifications of your FOX shock absorber body for a proper fit.

Does this spring come with any hardware?

This product listing is for the coilover spring only. Any necessary hardware, such as spring perch collars or retainers, would typically be part of the shock absorber assembly or sold separately.

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Fox Coilover Spring 18.000 TLG X 3.00 ID X 400 lbs/in. Silver

Specifications

Brand: FOX
Part #: 039-43-400-A

Fox Coilover Spring 18.000 TLG X 3.00 ID X 400 lbs/in. Silver

Name: Fox Coilover Spring 18.000 TLG X 3.00 ID X 400 lbs/in. Silver
Brand: FOX
SKU: fox-fox-coilover-spring-18-000-tlg-x-3-00-id-x-400-lbs-in-silver-t14-706069
Price: 237.00 USD
Availability: BackOrder

$237.00

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fox Coilover Spring 18" x 3" ID x 400 lb/in. Silver

Key Features

This is a FOX coilover spring.
Spring measures 18 inches in length.
Inner diameter is 3 inches.
Spring rate is 400 lbs per inch.
Features a silver finish.

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Product Details

If you're looking to fine-tune your suspension's ride height and spring rate, this FOX coilover spring is a solid option. Designed to fit specific FOX shock bodies, it allows you to adjust how your vehicle handles bumps and corners. A 400 lb/in spring rate offers a firmer feel than stock, which can be beneficial for improved control during spirited driving or when carrying extra weight.

This spring measures 18 inches long with a 3-inch inner diameter, ensuring it pairs correctly with compatible FOX shock absorbers. The silver finish not only looks good but also indicates a well-made component from a trusted name in performance suspension. Swapping springs is a common way to dial in your vehicle's stance and performance, whether you're building a custom setup or replacing worn-out components.