ICON Stage 1 Suspension System – 2003-2009 4Runner & 2007-2009 FJ Cruiser | K53051

Upgrade the suspension performance, ride quality and stance of your Toyota with the ICON Vehicle Dynamics Stage 1 Suspension System, part #K53051.

Designed specifically for the 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser, this entry-level ICON suspension system combines adjustable 2.5 Series front coilovers, matched 2.0 Aluminum Series rear shocks, and 2-inch rear coil springs to provide a balanced suspension upgrade for both on-road and off-road driving.

The front coilovers are adjustable from 0-3.5 inches of lift, allowing you to dial in the front ride height while gaining increased wheel travel, improved damping control and reduced factory body roll.

Vehicle Fitment

Toyota 4Runner

• 2003

• 2004

• 2005

• 2006

• 2007

• 2008

• 2009

Toyota FJ Cruiser

• 2007

• 2008

• 2009

IMPORTANT: ICON lists the complete K53051 Stage 1 system specifically for 2003-2009 4Runner and 2007-2009 FJ Cruiser applications.

Individual components within the system may fit additional Toyota/Lexus applications, but that does not extend the complete K53051 system fitment.

Features

• Complete ICON Stage 1 Suspension System

• Fits 2003-2009 Toyota 4Runner

• Fits 2007-2009 Toyota FJ Cruiser

• Front ride height adjustable from 0-3.5 inches

• Includes ICON 2.5 Series front coilover shocks

• Includes ICON 2.0 Aluminum Series rear IFP shocks

• Includes 2-inch lift rear coil springs

• Vehicle-specific front and rear shock tuning

• Increased wheel travel compared with stock

• Improved on-road and off-road ride quality

• Improved shock damping and vehicle control

• Helps reduce factory body roll

• 6061 aircraft-grade aluminum CNC-machined components

• Corrosion-resistant CAD-plated front coilover shock bodies

• Heavy-duty 7/8" front shock shafts

• 5/8" rear shock shafts

• FK Rod End bearings for longevity and minimal deflection

• Fully serviceable shocks

• Bolt-on installation

• No cutting or welding required

• ICON Vehicle Dynamics part number K53051

ICON Stage 1 Suspension System

The K53051 is ICON's entry-level suspension system for the 2003-2009 Toyota 4Runner and 2007-2009 FJ Cruiser, but "entry-level" doesn't mean basic replacement suspension.

ICON engineered the Stage 1 system to provide a substantial improvement in both on-road handling and off-road suspension performance.

The front and rear shocks use vehicle-specific tuning designed to work together as a complete system, providing consistent damping and vehicle control from front to rear.

This makes the K53051 an excellent suspension upgrade for:

• Daily driving

• Off-roading

• Overlanding

• Trail driving

• Camping and backcountry travel

• Modified vehicles

• Larger tire and wheel combinations

• Drivers looking for improved handling and ride quality

Adjustable 0-3.5" Front Lift

The ICON 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 setup.

Rather than simply adding a spacer above the factory suspension, ICON's coilover system replaces the factory front shock and spring assembly with a performance-oriented suspension component designed to improve both ride height and damping performance.

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.

ICON 2.5 Series Front Coilovers

The front of the K53051 system uses ICON 2.5 Series Vehicle-Specific Internal Reservoir Coilovers.

Key features include:

• Vehicle-specific shock tuning

• 2.5-inch shock body

• Adjustable ride height

• 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

The larger shock body and vehicle-specific tuning provide improved damping and heat management compared with conventional factory replacement shocks.

2.0 Aluminum Series Rear Shocks

ICON pairs the front coilovers with 2.0 Aluminum Series rear IFP shocks specifically tuned to complement the front suspension.

The matched front-to-rear tuning provides smooth and consistent damping throughout the vehicle.

Rear shock features include:

• 2.0-inch aluminum shock body

• Internal Floating Piston (IFP) design

• Vehicle-specific tuning

• Heavy-duty 5/8-inch shock shaft

• Designed for 1-3 inches of rear lift

• Fully serviceable construction

2" Rear Lift Coil Springs

The K53051 system includes a pair of ICON 2-inch rear lift coil springs.

These springs are engineered to improve ride quality and handling while providing the additional rear ride height needed to complement the adjustable front coilovers.

The combination creates a more balanced suspension system rather than simply lifting the front of the vehicle.

System Components

The ICON K53051 Stage 1 Suspension System includes:

Front Coilovers

• ICON 58640

• Quantity: 1 pair

• 2.5 Series Vehicle-Specific Internal Reservoir Coilovers

• Adjustable 0-3.5" front lift

Rear Coil Springs

• ICON 52700

• Quantity: 1 pair

• 2" rear lift coil springs

Rear Shocks

• ICON 56505

• Quantity: 2

• 2.0 Aluminum Series Vehicle-Specific Internal Reservoir shocks

• Designed for 1-3" rear lift applications

Wheel & Tire Recommendations

ICON confirms that OEM wheels and tires are compatible with the K53051 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 notes that fender trimming and other modifications may be required.

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

Expedition Coil Option for Heavier Vehicles

For vehicles carrying substantial additional weight, ICON identifies an optional 700 lb/in Expedition Coil.

This can be useful for heavily equipped 4Runners and FJ Cruisers carrying additional front-end weight from accessories such as:

• Steel bumpers

• Winches

• Skid plates

• Recovery equipment

• Other permanent accessories

Spring selection should be based on the vehicle's actual configuration and additional weight.

Fully Serviceable ICON Shocks

The shocks included with the K53051 system 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 Stage 1 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 ride-height adjustment.

Product Specifications

Manufacturer: ICON Vehicle Dynamics
Part Number: K53051
Product: Stage 1 Suspension System
Toyota 4Runner Fitment: 2003-2009
Toyota FJ Cruiser Fitment: 2007-2009
Front Shock Series: ICON 2.5 Series
Front Lift Range: 0-3.5"
Rear Shock Series: ICON 2.0 Aluminum Series IFP
Rear Shock Lift Range: 1-3"
Rear Coil Spring Lift: 2"
Front Shock Shaft: 7/8"
Rear Shock Shaft: 5/8"
Front Coilover Component: 58640
Rear Coil Spring Component: 52700
Rear Shock Component: 56505
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: 840103416793

Frequently Asked Questions

What vehicles does ICON K53051 fit?
ICON lists K53051 for the 2003-2009 Toyota 4Runner and 2007-2009 Toyota FJ Cruiser.

How much lift does ICON K53051 provide?
The front ICON coilovers are adjustable from 0-3.5 inches of lift, while the included rear coil springs provide approximately 2 inches of rear lift.

Does K53051 fit a 2010-2014 FJ Cruiser?
ICON specifically lists the complete K53051 system for the 2007-2009 FJ Cruiser. Although some individual rear components included in the kit fit later FJ Cruisers, the complete K53051 system should not be assumed compatible with 2010-2014 models.

Does K53051 fit the Lexus GX?
Some individual components included in K53051 are used on compatible Lexus GX applications, but ICON does not list the complete K53051 Stage 1 system for the GX. Follow ICON's complete-system application rather than individual component fitment.

What size tires does ICON recommend?
ICON recommends 33" x 11.50" aftermarket tires with its recommended wheel specifications. Larger tires may require trimming or additional modifications.

Can I keep my factory wheels and tires?
Yes. ICON specifically lists OEM wheel and tire fitment as compatible.

Does this kit include upper control arms?
No. K53051 is ICON's Stage 1 system and includes the front coilovers, rear shocks and rear coil springs. Upper control arms are not included.

Are the ICON shocks rebuildable?
Yes. ICON states that the shocks included in this suspension system are fully serviceable.

Is there an option for a heavily equipped vehicle?
Yes. ICON identifies an optional 700 lb/in Expedition Coil for heavier-equipped vehicles.

Does installation require cutting or welding?
No. ICON designed K53051 as a bolt-on suspension system with no cutting or welding required.

Do I need an alignment after installation?
Yes. A professional alignment is recommended after installing the suspension and setting the final front ride height.