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Upgrade Your Rear Suspension on the 2025-2026 Toyota 4Runner with the ICON 2.0 VS Internal Reservoir Rear Shock
The ICON 2.0 VS Series internal reservoir rear shock designed specifically for the 2025-2026 Toyota 4Runner. It provides 0 to 3 inches of rear lift height compatibility and delivers improved damping performance, suspension travel, and ride quality over the OEM rear shock.
The 2.0-inch diameter aluminum shock body features ICON vehicle-specific valving engineered for the new-generation 4Runner rear suspension geometry. An internal reservoir increases oil volume over a standard non-reservoir shock design for better thermal management during off-road use. The ICON 56523 is the entry-level rear shock upgrade for the 2025-2026 4Runner platform and pairs with the ICON 52753 dual rate rear coil springs and ICON front coilover kits for a complete suspension build.
Key Features
- 0 to 3 inches of rear lift compatibility for the 2025-2026 Toyota 4Runner
- 2.0-inch diameter aluminum shock body with internal reservoir
- Vehicle-specific valving engineered for the new-generation 4Runner rear suspension
- Improved suspension travel and ride quality over OEM rear shock
- CAD plated finish for corrosion resistance
- Fully rebuildable design for long-term serviceability
- Compatible with ICON rear coil springs and front coilovers for a complete system build
Vehicle Fitment
| Year Range | Make | Model |
|---|---|---|
| 2025-2026 | Toyota | 4Runner |
Specifications
| Detail | Value |
|---|---|
| Part Number | 56523 |
| Position | Rear |
| Lift Compatibility | 0 to 3 inches |
| Shock Body Diameter | 2.0 inches |
| Reservoir Type | Internal reservoir (VS IR) |
| Finish | CAD plated for corrosion resistance |
| Serviceability | Fully rebuildable |
| Sold As | Each (single shock) |
| UPC | N/A |
What's Included
- 1x ICON 2.0 VS Series internal reservoir rear shock
- Installation hardware
About ICON Vehicle Dynamics
ICON Vehicle Dynamics is a California-based manufacturer of high-performance suspension components for trucks, SUVs, and off-road vehicles. ICON designs, engineers, and manufactures shocks, coilovers, upper control arms, and complete suspension systems in the USA to deliver improved performance, ride quality, and long-term durability.
Related Suspension Parts on Our Site
- ICON 57872P Rear 2.5 VS RR Shock Pair (2025-2026 Toyota 4Runner) - Premium remote reservoir rear shock option
- ICON 52753 Rear Dual Rate Coil Spring Kit (2025-2026 Toyota 4Runner) - Rear lift springs to pair with this shock
- ICON 58692 Front 2.5 VS IR Coilover Kit (2025-2026 4Runner 4WD) - Front coilover to build a complete system
- ICON 58693 Front 2.5 VS IR Coilover Kit (2025-2026 4Runner 2WD) - Front coilover for 2WD models
Frequently Asked Questions
What is the ICON 56523?
The ICON 56523 is a 2.0 VS Series internal reservoir rear shock for the 2025-2026 Toyota 4Runner. It delivers improved damping performance and suspension travel over the OEM rear shock, with ICON vehicle-specific valving and a 2.0-inch diameter aluminum shock body with an internal reservoir for better thermal management.
Is the ICON 56523 sold individually or as a pair?
The ICON 56523 is sold individually as a single rear shock. To replace both rear shocks, two units are required. A paired option at a higher spec is available in the ICON 57872P, which is sold as a pre-paired set of two 2.5 VS remote reservoir rear shocks.
How is the ICON 56523 different from the ICON 57872P?
The ICON 56523 is a 2.0-inch body internal reservoir shock sold individually at an accessible entry-level price point. The ICON 57872P is a 2.5-inch body remote reservoir shock sold as a pair, offering a larger oil volume, higher-performance remote reservoir design, and superior heat management for more demanding off-road and towing use. The 57872P is the premium option for users who prioritize maximum damping consistency and off-road capability.
How much lift does the ICON 56523 provide?
The ICON 56523 is a shock absorber, not a lift spring. It is compatible with 0 to 3 inches of rear lift height and is designed to work with rear coil spring lift kits such as the ICON 52753. The shock itself does not add lift; the coil spring determines ride height.
Does the ICON 56523 require new rear coil springs?
The ICON 56523 can be installed with factory rear coil springs. However, ICON recommends pairing the 56523 with ICON dual rate rear coil springs (52753) for the best performance and to achieve a lifted ride height. Upgraded springs and shocks together provide consistent valving and lift across the rear suspension.
Do I need a wheel alignment after installing the ICON 56523?
Replacing only the rear shock absorbers generally does not affect front wheel alignment. If you also install rear lift springs at the same time, a full 4-wheel alignment is recommended to ensure proper tire wear and handling after the ride height change.
Is the ICON 56523 rebuildable?
Yes. ICON 56523 shocks are fully rebuildable. ICON offers rebuild kits and rebuild services to restore the shock to factory specification. Rebuilding is a cost-effective option for extending the life of the shock or retuning valving for different applications.
Is the ICON 56523 covered by warranty?
ICON Vehicle Dynamics backs its products with a limited lifetime warranty against defects in materials and workmanship for the original purchaser. Claims are handled directly through ICON Vehicle Dynamics. Damage from improper installation or use outside product specifications is not covered.
Installation Instructions
- Safely raise and support the rear of the vehicle on jack stands. Remove the wheel for improved access to the rear shock.
- Support the rear suspension arm or axle with a floor jack to prevent the suspension from dropping when the shock is disconnected.
- Remove the upper and lower OEM shock mounting hardware and remove the OEM shock from the vehicle.
- Install the ICON 56523 shock in the same mounting positions. Torque all fasteners to ICON-specified values.
- Lower the jack supporting the suspension arm slowly and verify there is no binding.
- Reinstall the wheel, lower the vehicle, and bounce the rear suspension several times before road testing.
WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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