ICON Stage 4 Suspension System with Tubular UCA & Remote Reservoir Shocks – 2003-2009 4Runner & 2007-2009 FJ Cruiser | K53054T

Take your Toyota's suspension performance to the next level with the ICON Vehicle Dynamics Stage 4 Suspension System with Tubular Upper Control Arms, part #K53054T.

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, tubular steel upper control arms with ICON Delta Joint, 2-inch rear lift coil springs, tubular steel rear lower links, and high-performance 2.5 Aluminum Series Remote Reservoir rear shocks with Bump Zone technology.

Compared with the ICON K53053T Stage 3 system, Stage 4 makes a major rear shock upgrade. The 2.0 rear shocks are replaced with larger 2.5 Series Remote Reservoir shocks, providing increased oil volume, enhanced cooling and improved resistance to shock fade during prolonged off-road use.

The rear shocks also feature ICON's Bump Zone technology, which significantly increases damping during the final 2 inches of compression travel to help prevent harsh bottom-out and provide a more controlled ride 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 K53054T Stage 4 system specifically for 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser applications.

Individual components included in the system may fit additional Toyota and Lexus vehicles, but that does not extend the fitment of the complete K53054T 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 tubular steel upper control arms

• ICON patented Delta Joint

• ICON tubular steel rear lower links

• Rear links provide pinion angle adjustment

• Rear links provide increased strength and improved suspension geometry

• Low-maintenance multi-durometer rear link bushings

• 2" rear lift coil springs

• ICON 2.5 Aluminum Series Remote Reservoir rear shocks

• Rear shocks feature ICON Bump Zone technology

• Remote reservoirs provide increased shock oil volume

• Enhanced shock cooling during prolonged use

• Improved resistance to shock fade

• Increased 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 shock 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 K53054T

What Does Stage 4 Add Over Stage 3?

The defining upgrade from K53053T Stage 3 to K53054T Stage 4 is the rear shock package.

Stage 3 uses ICON 2.0 rear shocks, while Stage 4 upgrades to:

• 2.5 Aluminum Series rear shocks

• Remote reservoirs

• Increased shock oil volume

• Enhanced cooling

• Improved resistance to shock fade

• Heavy-duty 7/8" shock shafts

• ICON Bump Zone technology

The Stage 4 system retains the Extended Travel front coilovers, tubular Delta Joint upper control arms, 2" rear springs and tubular rear lower links found in the tubular Stage 3 package.

For vehicles that spend substantial time off road or repeatedly cycle the suspension over rough terrain, the larger remote reservoir rear shocks provide a significant performance advantage.

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 the front ride height to be adjusted 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 assemblies with performance 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

K53054T 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 Tubular Upper Control Arms

The K53054T Stage 4 system includes ICON 58451DJ tubular steel upper control arms.

These heavy-duty UCAs are designed to complement the Extended Travel front coilovers and provide the additional articulation required when increasing front suspension travel and ride height.

The tubular control arms provide a strong and durable alternative to ICON's billet aluminum UCA design while retaining the performance benefits of the ICON Delta Joint.

ICON Delta Joint

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

The Delta Joint is a heavy-duty high-angle joint designed to combine the durability of a ball joint with the increased angularity and performance characteristics of 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 keep dirt, water and contaminants away from internal components

• Designed for quiet operation

• Excellent for daily-driven and off-road vehicles

Tubular Steel Rear Lower Links

The K53054T includes ICON 54000T tubular steel rear lower links.

These links replace the factory rear lower control arms with substantially stronger components designed specifically for lifted and off-road applications.

Benefits include:

• Heavy-duty tubular steel construction

• Increased strength compared with OE rear links

• Adjustable rear pinion angle

• Improved rear suspension geometry

• Correct roll-steer geometry

• Low-maintenance multi-durometer bushings

• Improved on-road and off-road handling

• Direct replacement for the factory rear lower links

Adjustable Rear Pinion Angle

Lifting a vehicle changes the relationship between the rear axle and driveshaft.

The ICON tubular rear lower links allow adjustment for optimum rear pinion angle, helping maintain proper driveline geometry after the vehicle has been lifted.

This is an important functional advantage over non-adjustable factory rear links.

Correct Roll-Steer Geometry

ICON designed the tubular rear lower links to provide correct roll-steer geometry.

This contributes to predictable rear suspension behavior and improved handling both on pavement and off road.

The links therefore provide more than simply increased strength—they're designed as a functional suspension upgrade.

2" Rear Lift Coil Springs

The K53054T 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 K53054T is the pair of ICON 57810P 2.5 Aluminum Series Remote Reservoir rear shocks.

Compared with conventional 2.0 rear shocks, the larger 2.5 Series shocks provide greater oil capacity and enhanced cooling.

Rear shock features include:

• 2.5-inch aluminum shock body

• External remote reservoirs

• Increased shock oil volume

• Enhanced cooling

• Improved 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 driving over rough terrain, repeated suspension movement causes shock temperatures to increase. Excessive heat can eventually reduce damping performance.

The remote reservoir design increases the total oil volume of the shock system while providing additional capacity for heat management.

This allows the rear suspension to work harder for longer periods without noticeable shock fade.

The Stage 4 system is especially well suited for:

• Aggressive trail driving

• High-speed off-road use

• Washboard roads

• Overlanding

• Extended backcountry travel

• Heavily modified vehicles

• Repeated rough-terrain driving

ICON Bump Zone Technology

The 2.5 Series rear shocks included with K53054T feature ICON's Bump Zone technology.

Bump Zone significantly increases damping during the final 2 inches of compression travel.

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

This helps:

• Reduce harsh bottom-out

• Improve suspension control

• Absorb larger impacts

• Maintain better vehicle composure

• Provide a more controlled ride over changing terrain

Balanced Front-to-Rear Damping

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

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

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

System Components

The ICON K53054T Stage 4 Suspension System includes:

Front Extended Travel Coilovers

• ICON 58645

• Quantity: 1 kit / pair

• 2.5 Series Vehicle-Specific Internal Reservoir Coilovers

• Extended Travel

• Adjustable 0-3.5" front lift

Tubular Upper Control Arms

• ICON 58451DJ

• Quantity: 1 kit

• Tubular steel construction

• ICON Delta Joint

Tubular Rear Lower Links

• ICON 54000T

• Quantity: 1 kit

• Heavy-duty tubular steel construction

• Adjustable pinion angle

• Multi-durometer bushings

Rear Coil Springs

• ICON 52700

• Quantity: 1 kit / 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 K53054T 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"

ICON notes that larger tires may fit, but fender trimming and other modifications will be required.

Actual tire clearance can vary based on wheel width, 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

Fully Serviceable ICON Shocks

The ICON shocks included with K53054T are fully serviceable.

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

Bolt-On Installation

The ICON K53054T 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 Stage 4 also replaces the rear lower links, the rear pinion angle should be properly adjusted during installation.

Product Specifications

Manufacturer: ICON Vehicle Dynamics
Part Number: K53054T
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 Tubular Steel
UCA Joint: ICON Delta Joint
Rear Lower Links: ICON Tubular Steel
Rear Link Adjustment: Adjustable Pinion Angle
Rear Link Bushings: Multi-Durometer
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
Upper Control Arm Component: 58451DJ
Rear Lower Link Component: 54000T
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
Shipping Weight: 153 lbs.
UPC: 840103416854

Frequently Asked Questions

What vehicles does ICON K53054T fit?
ICON lists K53054T for the 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser.

How much lift does ICON K53054T 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 K53053T Stage 3 and K53054T Stage 4?
The primary upgrade is the rear shock package. K53054T replaces the Stage 3 rear shocks with 2.5 Aluminum Series Remote Reservoir rear shocks featuring ICON Bump Zone technology.

What is the difference between K53054 and K53054T?
K53054T uses tubular steel upper control arms and tubular steel rear lower links. K53054 uses ICON's billet versions of those suspension components.

What upper control arms are included with K53054T?
K53054T includes ICON 58451DJ tubular steel upper control arms with Delta Joint.

What rear lower links are included?
The system includes ICON 54000T tubular steel rear lower links with adjustable pinion angle and multi-durometer bushings.

What are the advantages of the 2.5 remote reservoir rear shocks?
The larger shock body and remote reservoir provide increased oil volume and enhanced cooling, helping the shocks maintain consistent damping during prolonged demanding use.

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

Does K53054T use Extended Travel front coilovers?
Yes. The system includes ICON 58645 Extended Travel 2.5 Series front coilovers.

Can the rear pinion angle be adjusted?
Yes. The ICON tubular rear lower links allow adjustment for optimum rear pinion angle.

Does K53054T fit a 2010-2014 FJ Cruiser?
No. ICON lists the complete K53054T Stage 4 system specifically for the 2007-2009 FJ Cruiser.

Does K53054T fit the Lexus GX?
Some individual components included in the system fit Lexus GX applications, but ICON does not list the complete K53054T 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 K53054T are fully serviceable.

Does installation require cutting or welding?
No. ICON designed K53054T as a bolt-on suspension system with no cutting or welding required.