ICON 2022-2025 Toyota Tundra 2.5 Series VS IR Coilover Kit | 58670

Product Description
The ICON Vehicle Dynamics VS 2.5 Series Internal Reservoir Front Coilover Kit (Part Number 58670) is engineered for the front axle of 2022–2025 Toyota Tundra and 2023–2025 Toyota Sequoia (excluding some TRD/AVS/Hybrid variants) applications.

Key technical features and system architecture:

• 2.5-inch shock body diameter enabling increased piston area and travel compared to stock fixtures. 

• Vehicle-specific shock length and valving developed to manage load distribution, high-wheel-travel events and both on-road and off-road dynamics.

• Lift adjustability – up to 1.25 to 3.5 inches of front suspension lift on Tundra applications; up to 3.0–4.5 inches in certain Sequoia variants with factory parameters. 

• Premium construction: the coil springs are ICON-engineered; bodies use corrosion-resistant CAD plating; shafts are 7/8″ diameter; components include 6061 aircraft-grade aluminum CNC-machined parts and FK rod-end bearings for reduction of deflection and enhanced service life. 

• Fully rebuildable and re-tunable design enabling long-term serviceability and performance tuning.

Fitment and installation context:
This kit is a direct bolt-on upgrade—no drilling or welding required for compatible applications. Note, however, there are important technical caveats: For lift heights above approximately 2.25″ on 4WD models, ICON recommends additional components such as a sway bar drop bracket (Part #55154) or upper control arms (UCAs) to maintain proper alignment and front axle geometry.  Also, vehicles equipped with adaptive variable suspension (AVS), height-control air suspension or hybrid powertrains may be excluded.

Operational benefits:
By increasing wheel travel and optimizing damping control via the internal reservoir architecture and tuned valving, this coilover kit enhances ride quality across mixed terrain while maintaining front-end control and axle geometry under increased load or aftermarket wheel/tire combinations. The height adjustability enables use of larger tires and more aggressive stance without compromising structural dynamics or ride compliance.

Technical installation notes:
According to the official installation instructions, the assemblies are nitrogen-charged at 250 psi at the factory: releasing this pressure will adversely affect shock performance and void warranty. Also, a preload exceeding 1.125″ of exposed thread between the top cap and coil-adjuster nut will reduce droop travel and cause binding of the coilover system—installation must follow the published steps and torque values. 

This Part Fits:

Expert-oriented FAQ
Q1: What is the maximum front lift range achieved with this kit on a stock vehicle, and does that vary by model?
A1: On standard 2022–2025 Tundra models the kit supports ~1.25″ to 3.5″ of front lift. On certain 2023-2025 Sequoia sub-models the range extends to ~3.0″–4.5″ depending on equipment. 

Q2: Does this coilover kit require any additional modifications when installed?
A2: Yes. For lift heights above ~2.25″ on 4WD Tundra models, ICON recommends installation of a sway bar drop bracket (Part #55154) and possibly upper control arms to maintain alignment. Vehicles with AVS, air-suspension or hybrid engine may not be compatible. 

Q3: Is the damping adjustable, and can the kit be rebuilt?
A3: The damping is valved for the application but is not externally adjustable for rebound/compression. However, the shock assemblies are 100% rebuildable and re-tunable via service procedures and rebuild kits (e.g., Part #252010 for 2.5 IFP rebuild). 

Q4: What are the key durability and construction features that differentiate this kit from stock suspension?
A4: Key differentiators include: the larger 2.5″ shock body for improved piston area and cooling; corrosion-resistant CAD plating on the body; 6061 aircraft-grade aluminum CNC-machined components; robust 7/8″ diameter shafts; and FK rod-end bearings to mitigate deflection under load and preserve geometry under travel. 

Q5: Are there any critical installation warnings that an expert installer should be aware of?
A5: Yes. The kit comes pre-charged to 250 psi nitrogen — releasing that pressure or improper installation can lead to degraded performance and warranty invalidation. Also, ensuring correct preload (no more than ~1.125″ of thread exposure) is essential to preserve droop travel and avoid coil binding.