ICON Stage 4 Suspension System with Billet UCA & Remote Reservoir Shocks – 2003-2009 4Runner & 2007-2009 FJ Cruiser | K53054

Take your Toyota's suspension performance to the next level with the ICON Vehicle Dynamics Stage 4 Suspension System, part #K53054, designed specifically for the 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser.

The ICON Stage 4 system combines Extended Travel 2.5 Series front coilovers, billet aluminum upper control arms with ICON Delta Joint, 2-inch rear lift coil springs, billet aluminum rear lower links, and high-performance 2.5 Aluminum Series Remote Reservoir rear shocks with Bump Zone technology.

Compared with the ICON Stage 3 system, Stage 4 makes a major rear shock upgrade. The 2.0 rear shocks used in Stage 3 are replaced by larger 2.5 Series Remote Reservoir shocks, providing increased oil volume, improved heat dissipation and greater resistance to shock fade during extended off-road use.

The rear shocks also incorporate ICON's Bump Zone technology, which significantly increases damping during the final 2 inches of compression travel to help reduce harsh bottom-out events over demanding terrain.

Vehicle Fitment

Toyota 4Runner

• 2003

• 2004

• 2005

• 2006

• 2007

• 2008

• 2009

Toyota FJ Cruiser

• 2007

• 2008

• 2009

IMPORTANT: ICON lists the complete K53054 Stage 4 system specifically for 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser applications.

Individual components included in K53054 may fit additional Toyota and Lexus applications, but that does not extend the fitment of the complete K53054 suspension system.

Features

• Complete ICON Stage 4 Suspension System

• Fits 2003-2009 Toyota 4Runner

• Fits 2007-2009 Toyota FJ Cruiser

• Adjustable 0-3.5" front lift

• ICON Extended Travel 2.5 Series front coilovers

• Increased front droop and wheel travel

• ICON billet aluminum upper control arms

• ICON patented Delta Joint

• ICON billet aluminum rear lower links

• Rear lower links provide on-vehicle pinion angle adjustment

• 2" rear lift coil springs

• ICON 2.5 Aluminum Series Remote Reservoir rear shocks

• Rear shocks feature ICON Bump Zone technology

• Remote reservoirs increase shock oil volume

• Improved shock cooling during extended use

• Increased resistance to shock fade

• Increased rear damping during the final 2" of compression travel

• Helps reduce harsh suspension bottom-out

• Vehicle-specific front and rear shock tuning

• Increased wheel travel and ride quality over stock

• Improved on-road and off-road handling

• 6061 aircraft-grade CNC-machined aluminum components

• Corrosion-resistant CAD-plated front coilover shock bodies

• Heavy-duty 7/8" front shock shafts

• Heavy-duty 7/8" rear shock shafts

• FK Rod End bearings for extended longevity and minimal deflection

• Fully serviceable shocks

• Bolt-on installation

• No cutting or welding required

• ICON Vehicle Dynamics part number K53054

What Does Stage 4 Add Over Stage 3?

The defining upgrade from ICON Stage 3 to Stage 4 is the rear shock package.

Stage 3 uses ICON's 2.0 Aluminum Series rear shocks, while Stage 4 upgrades to:

• 2.5 Aluminum Series rear shocks

• Remote reservoirs

• Increased shock oil volume

• Improved heat dissipation

• Greater resistance to shock fade

• ICON Bump Zone technology

• Heavy-duty 7/8" rear shock shafts

The rest of the major Stage 3 components remain, including Extended Travel front coilovers, billet Delta Joint upper control arms, rear lift springs and billet rear lower links.

For drivers who spend more time off road, particularly over rough terrain where the suspension is cycling repeatedly, the larger remote reservoir rear shocks represent a significant performance upgrade.

Adjustable 0-3.5" Front Lift

The ICON Extended Travel 2.5 Series front coilovers provide 0 to 3.5 inches of adjustable front lift on a stock-equipped vehicle.

This allows you to adjust the front ride height based on your desired stance, tire size and vehicle configuration.

Unlike a basic spacer lift, the ICON system replaces the factory front shock and spring assembly with performance-oriented coilovers designed to improve:

• Ride quality

• Shock damping

• Suspension travel

• Vehicle control

• Off-road performance

• Front ride height

Front Lift Range: 0-3.5"

ICON notes that published coilover lift heights are based on a stock-equipped vehicle. Added weight from aftermarket bumpers, winches, skid plates and other accessories can affect actual ride height.

Extended Travel 2.5 Series Front Coilovers

The K53054 uses ICON 58645 Extended Travel 2.5 Series Vehicle-Specific Internal Reservoir Coilovers.

The Extended Travel design provides additional front suspension droop and wheel travel when combined with the included ICON upper control arms.

Key features include:

• 2.5-inch shock body

• Extended Travel design

• Vehicle-specific shock tuning

• Adjustable 0-3.5" front lift

• Increased front droop travel

• Corrosion-resistant CAD-plated shock body

• Heavy-duty 7/8-inch shock shaft

• 6061 aircraft-grade aluminum CNC-machined components

• FK Rod End bearings

• Fully serviceable construction

ICON Billet Upper Control Arms

The K53054 Stage 4 system includes ICON's premium billet aluminum upper control arms with Delta Joint.

These UCAs are CNC machined from 6061 aircraft-grade aluminum and are designed to work with the Extended Travel front coilovers.

The upgraded control arms provide the additional articulation required to take advantage of the Extended Travel coilovers while helping maintain appropriate suspension geometry at increased ride heights.

ICON Delta Joint

The billet upper control arms use ICON's patented Delta Joint.

The Delta Joint is a heavy-duty high-angle joint designed to combine the durability and weather resistance of a ball joint with the increased angularity associated with a traditional uniball.

Delta Joint features include:

• Heavy-duty high-angle design

• Greater angularity than a typical ball joint

• Metal-on-metal construction

• Greaseable design

• Zinc-plated housing for corrosion resistance

• Protective grease seal

• Helps protect internal components from dirt, water and contaminants

• Designed for quiet operation

• Excellent for daily-driven and off-road vehicles

Billet Aluminum Rear Lower Links

The K53054 retains ICON's premium billet aluminum rear lower links.

These heavy-duty links replace the factory rear lower links and provide both increased strength and important suspension adjustment capabilities.

Benefits include:

• CNC-machined 6061 billet aluminum construction

• Increased strength compared with factory links

• On-vehicle pinion angle adjustment

• Improved rear suspension geometry

• Improved on-road and off-road handling

• Heavy-duty construction for demanding trail use

The ability to adjust pinion angle is particularly useful on lifted vehicles where changes in rear suspension geometry can affect driveline angles.

2" Rear Lift Coil Springs

The K53054 includes ICON 52700 2-inch rear lift coil springs.

These springs complement the adjustable front coilovers and provide additional rear ride height while maintaining balanced front-to-rear suspension performance.

2.5 Aluminum Series Remote Reservoir Rear Shocks

One of the most important components of the K53054 Stage 4 system is the pair of ICON 57810P 2.5 Aluminum Series Remote Reservoir rear shocks.

Compared with the 2.0 rear shocks used in Stage 3, the larger 2.5 Series shocks provide greater oil capacity and improved damping capability.

Rear shock features include:

• 2.5-inch aluminum shock body

• External remote reservoirs

• Increased shock oil volume

• Improved heat dissipation

• Greater resistance to shock fade

• Vehicle-specific tuning

• Heavy-duty 7/8-inch shock shafts

• Designed for 1-3 inches of rear lift

• ICON Bump Zone technology

• Fully serviceable construction

Why Remote Reservoir Shocks?

Shock absorbers convert suspension movement into heat.

During prolonged off-road driving over rough terrain, the shocks may cycle hundreds or thousands of times. As shock temperature increases, damping performance can begin to decrease.

The remote reservoir design increases the total amount of shock oil in the system and provides additional surface area for heat dissipation.

The result is improved thermal management, allowing the rear shocks to work harder for longer periods without noticeable shock fade.

This makes the Stage 4 system particularly well suited for:

• Aggressive trail driving

• High-speed off-road driving

• Washboard roads

• Overlanding

• Extended backcountry travel

• Heavily modified vehicles

• Repeated rough-terrain use

ICON Bump Zone Technology

The 2.5 Series rear shocks included with K53054 feature ICON's Bump Zone technology.

Bump Zone significantly increases the shock's damping ability during the final 2 inches of compression travel.

As the rear suspension approaches full compression, the increased damping helps slow the axle's movement before the suspension reaches the end of its travel.

This helps:

• Reduce harsh bottom-out events

• Improve suspension control

• Absorb larger impacts

• Maintain better vehicle composure

• Provide a more controlled ride over varying terrain

For an FJ Cruiser or 4Runner used aggressively off road, Bump Zone provides an additional layer of suspension control when encountering larger bumps, dips and trail obstacles.

Balanced Front-to-Rear Damping

ICON designed the Stage 4 system as a complete suspension package rather than a collection of unrelated components.

The 2.5 Series front coilovers and 2.5 Series rear remote reservoir shocks provide more balanced damping capability from front to rear.

Vehicle-specific tuning helps provide predictable handling and suspension response across varying terrain.

System Components

The ICON K53054 Stage 4 Suspension System includes:

Front Extended Travel Coilovers

• ICON 58645

• Quantity: 1 pair

• 2.5 Series Vehicle-Specific Internal Reservoir Coilovers

• Extended Travel

• Adjustable 0-3.5" front lift

Billet Upper Control Arms

• ICON billet aluminum construction

• ICON Delta Joint

• Designed for Extended Travel applications

Billet Rear Lower Links

• ICON billet aluminum construction

• On-vehicle pinion angle adjustment

• Heavy-duty replacement for OE links

Rear Coil Springs

• ICON 52700

• Quantity: 1 pair

• 2" rear lift coil springs

Rear Remote Reservoir Shocks

• ICON 57810P

• Quantity: 1 pair

• 2.5 Aluminum Series

• Remote reservoir

• Vehicle-specific tuning

• Bump Zone technology

• Designed for 1-3" rear lift

Wheel & Tire Recommendations

ICON confirms that OEM wheels and tires are compatible with the K53054 suspension system.

For aftermarket wheel and tire combinations, ICON recommends:

17" Wheels

• 17x8.5"

• 4.75" backspacing

• 0mm offset

18" Wheels

• 18x9"

• 5.00" backspacing

• 0mm offset

20" Wheels

• 20x9"

• 5.00" backspacing

• 0mm offset

Recommended Aftermarket Tire Size:
33" x 11.50"

Larger tires may fit, but ICON states that fender trimming and additional modifications will be required.

Actual tire clearance can vary based on wheel dimensions, offset, backspacing, suspension height and vehicle configuration.

Expedition Coil Option for Heavier Vehicles

ICON identifies an optional 700 lb/in Expedition Coil for heavier-equipped vehicles.

This may be useful for FJ Cruisers and 4Runners carrying substantial permanent front-end weight from accessories such as:

• Steel bumpers

• Winches

• Skid plates

• Recovery equipment

• Other permanently installed accessories

Spring selection should be based on the actual weight and configuration of the vehicle.

Fully Serviceable ICON Shocks

The ICON shocks included with K53054 are fully serviceable.

Unlike disposable replacement shocks, ICON shocks can be serviced and rebuilt as components wear, helping extend the usable life of the suspension system.

Bolt-On Installation

The ICON K53054 Stage 4 Suspension System is designed as a bolt-on suspension upgrade.

No cutting or welding is required.

A professional wheel alignment should be performed after installation and final front ride-height adjustment.

Because the system also includes adjustable rear lower links, the rear pinion angle should be properly adjusted during installation.

Product Specifications

Manufacturer: ICON Vehicle Dynamics
Part Number: K53054
Product: Stage 4 Suspension System
Toyota 4Runner Fitment: 2003-2009
Toyota FJ Cruiser Fitment: 2007-2009
Front Shock Series: ICON 2.5 Series Extended Travel
Front Lift Range: 0-3.5"
Upper Control Arms: ICON Billet Aluminum
UCA Joint: ICON Delta Joint
Rear Lower Links: ICON Billet Aluminum
Rear Link Adjustment: On-Vehicle Pinion Angle Adjustment
Rear Coil Spring Lift: 2"
Rear Shock Series: ICON 2.5 Aluminum Series
Rear Shock Type: Remote Reservoir
Rear Shock Technology: ICON Bump Zone
Rear Shock Lift Range: 1-3"
Front Shock Shaft: 7/8"
Rear Shock Shaft: 7/8"
Front Coilover Component: 58645
Rear Coil Spring Component: 52700
Rear Shock Component: 57810P
OEM Wheel & Tire Compatible: Yes
Recommended Tire Size: 33" x 11.50"
Installation: Bolt-On
Cutting Required: No
Welding Required: No
Shocks Serviceable: Yes
UPC: 840103416854

Frequently Asked Questions

What vehicles does ICON K53054 fit?
ICON lists K53054 for the 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser.

How much lift does ICON K53054 provide?
The front Extended Travel coilovers provide 0-3.5 inches of adjustable lift, while the included rear coil springs provide approximately 2 inches of rear lift.

What is the difference between ICON Stage 3 and Stage 4?
The major upgrade is the rear shocks. Stage 4 replaces the Stage 3 2.0 rear shocks with 2.5 Aluminum Series Remote Reservoir rear shocks featuring ICON Bump Zone technology.

What are the advantages of 2.5 remote reservoir rear shocks?
The larger shock body and remote reservoir provide increased oil volume and improved heat dissipation, allowing the shocks to maintain more consistent damping during extended demanding use.

What is ICON Bump Zone technology?
Bump Zone significantly increases rear shock damping during the final 2 inches of compression travel, helping reduce harsh bottom-out and improve suspension control during larger impacts.

Does K53054 use Extended Travel front coilovers?
Yes. K53054 includes ICON 58645 Extended Travel 2.5 Series front coilovers.

What upper control arms are included?
K53054 includes ICON's billet aluminum upper control arms with Delta Joint.

Does K53054 include upgraded rear lower links?
Yes. The system includes ICON billet aluminum rear lower links with on-vehicle pinion angle adjustment.

Does K53054 fit a 2010-2014 FJ Cruiser?
No. ICON lists the complete K53054 system specifically for the 2007-2009 FJ Cruiser.

Does K53054 fit the Lexus GX?
Some individual components included in K53054 may fit Lexus GX applications, but ICON does not list the complete K53054 Stage 4 system for the GX. Follow ICON's complete-system fitment.

What size tires does ICON recommend?
ICON recommends 33" x 11.50" aftermarket tires with its specified wheel dimensions. Larger tires require additional clearance modifications.

Can I use the factory wheels and tires?
Yes. ICON specifically lists OEM wheels and tires as compatible.

Are the ICON shocks rebuildable?
Yes. ICON states that the shocks included with K53054 are fully serviceable.

Does installation require cutting or welding?
No. ICON designed K53054 as a bolt-on suspension system with no cutting or welding required.