King Shocks 3.0 ID Coil Springs 14 x 550lb - SPR3-14-550

The King Shocks 3.0 ID Coil Spring 14" x 550lb (SPR3-14-550) is a purpose-built off-road replacement and upgrade spring designed to work with King's 2.5" diameter shock bodies — the same shock bodies found on King's widely respected off-road and race shock lineup. Whether you're running King off-road shocks on a Tacoma, F-150, F-250, or a dedicated race rig, selecting the right coil spring rate and length is critical to dialing in your suspension performance on any terrain. This 14-inch, 550 lb/in spring gives builders and tuners a firm yet versatile option suited to heavier builds or more aggressive off-road use cases.

Key Features & Benefits

• Specifically Wound for Off-Road Applications: King Shocks develops spring rates, wire diameters, and coil lengths through extensive real-world testing across all types of terrain — so you're not getting a generic automotive spring adapted for dirt use, but one built for it from the ground up.
• High-Tensile Chrome Silicon Wire Construction: Each King coil spring is manufactured from the finest quality, high-tensile chrome silicon wire available — a material known for its fatigue resistance and ability to maintain consistent spring rates under repeated compression cycles, exactly what demanding off-road use demands.
• Closed and Ground Ends: King coil springs are closed and ground to sit flat and deflect true. This means even spring loading across your shock body, reducing side loading and improving suspension geometry consistency over rough terrain.
• Made in the USA: King coil springs are manufactured to King Shocks' own specifications in the USA, ensuring quality control consistent with the brand's reputation in King off-road race shocks and OEM performance applications.
• 14" Free Length at 550 lb/in Rate: The 14-inch free length paired with a 550 lb/in spring rate makes this spring well-suited to applications requiring more travel or longer shock setups, particularly useful for lifted trucks and purpose-built off-road vehicles where the extra length helps maintain preload in extended positions.
• Broad Rate Selection Available: The SPR3-14-550 is part of a comprehensive lineup of 3.0" ID springs in the 14" length — ranging from 150 lb/in up to 700 lb/in — so you can fine-tune your build by swapping spring rates without changing shock hardware.
• Compatible with King 2.5" Shock Bodies: King's 3.0" inner diameter coil springs are designed specifically for use on King's 2.5" diameter shock bodies, ensuring proper fitment and load distribution whether you're running King coilovers, piggyback shocks, or remote-reservoir setups.

Specifications

• Brand: King Shocks
• Part Number (MPN): SPR3-14-550
• SKU: KINSPR3-14-550
• Inner Diameter (ID): 3.0"
• Free Length: 14"
• Spring Rate: 550 lb/in
• Compatible Shock Body Diameter: 2.5"
• Material: High-tensile chrome silicon wire
• End Style: Closed and ground (sits flat, deflects true)
• Manufactured: USA

Fitment

The King Shocks SPR3-14-550 is a universal coil spring — it does not fit a specific vehicle by bolt pattern or mounting bracket. Instead, fitment is determined by your shock body diameter and your coilover or coil-over-shock setup. This spring is designed for use with King 2.5" diameter shock bodies. It is commonly used in conjunction with King off-road shocks on platforms such as:

• Toyota Tacoma with King off-road shock upgrades
• Ford F-150 and F-250 King shock applications
• Full-size trucks, SUVs, and dedicated off-road race vehicles running King 2.5" shock bodies
• UTV and pre-runner builds using compatible King 2.5" shock hardware

Important: This spring will NOT fit King's 2.0" or other smaller-diameter shock bodies, nor is it intended for shock bodies requiring a 2.5", 3.75", or 4.25" ID spring — those require different King spring series. Always confirm your shock body diameter and required free length before ordering. If you're unsure which spring rate or length is correct for your specific King shock application, reach out to our team for fitment guidance before purchasing.

What's in the Box

• 1x King Shocks 3.0" ID Coil Spring — 14" free length, 550 lb/in rate (SPR3-14-550)

Why Buy from ThreePiece.us

ThreePiece.us has been serving performance and off-road enthusiasts since 2014, with a team of fitment specialists who understand the nuances of suspension builds — from daily-driven lifted trucks to dedicated King off-road race shock setups. When you order the King Shocks SPR3-14-550 here, you get:

• Free Shipping on every order — no minimums, no gimmicks.
• Affirm Financing — spread the cost of your suspension build over time with flexible payment options, including 0% APR where available.
• Expert Fitment Support — not sure if 550 lb/in is the right rate for your application, or whether 14" is the correct free length for your shock? Our team has helped over 10,000 customers get the right parts. Call us at 813-535-5801 or use the fitment help tool on this page.
• Genuine Products — every King Shocks product we sell is 100% authentic. We never sell replicas or counterfeit parts.

Frequently Asked Questions

Q: What shock bodies does the SPR3-14-550 fit?
A: King's 3.0" ID coil springs — including this SPR3-14-550 — are designed specifically for use with King 2.5" diameter shock bodies. If your King shocks have a different body diameter (such as 2.0"), you'll need a different spring series. Check your shock body diameter before ordering, or contact our fitment team for help.

Q: Is 550 lb/in the right spring rate for my truck?
A: Spring rate selection depends on your vehicle weight, shock travel, intended use (daily driving vs. race/off-road), and whether you're running the spring on a front or rear coilover setup. King offers the 14" length in rates ranging from 150 lb/in to 700 lb/in, so there's flexibility to tune. For a heavily built truck or a rig carrying significant front-end weight (winch, bumper, etc.), a higher rate like 550 lb/in is often appropriate for the front. When in doubt, contact our team — we're happy to discuss your build.

Q: Can I use this spring on non-King shock bodies that have a 2.5" diameter?
A: King specifies these springs for use with King 2.5" shock bodies. While the inner diameter (3.0") and spring rate (550 lb/in) are objective specs, we can only confirm compatibility with King's own shock hardware based on the manufacturer's documentation. Consult your shock manufacturer's specifications before pairing with non-King hardware.

Q: Does this come as a pair, or is it a single spring?
A: The SPR3-14-550 is sold as a single coil spring. If you are replacing or upgrading both sides of your vehicle's suspension, you will need to order two units.