JDM 2008–2014 Subaru WRX STI Complete Front & Rear Subframe Assembly – Brembo Brakes, R180 3.54 LSD, Axles, Hubs & Control Arms

Upgrade, restore, or convert your Subaru with this complete JDM 2008–2014 Subaru WRX STI front and rear subframe assembly from J-Spec Auto Sports.

This package combines many of the most desirable factory STI suspension, braking, hub, and drivetrain components into one matched assembly.

Instead of sourcing an R180 differential, STI axles, Brembo calipers, hubs, control arms, and subframes separately, this package provides the major components together from a JDM Subaru STI application.

The package includes a Subaru STI R180 limited-slip rear differential with a 3.54 final-drive ratio, along with OEM STI Brembo brake components, front and rear subframes, axles, hubs, control arms, and additional components shown in the actual inventory photographs.

This makes the package especially attractive for Subaru enthusiasts building:

• WRX-to-STI conversions
• STI restorations
• Performance street cars
• Track builds
• Rally builds
• Collision-repair projects
• Custom Subaru drivetrain conversions

QUICK DETAILS

Make: Subaru
Model: WRX STI
Years: 2008–2014
Generation: GRB / GVB STI Family
Package Type: Complete Front & Rear Subframe / Suspension / Brake / Differential Assembly
Rear Differential: R180 LSD
Final Drive: 3.54
Brake System: OEM Subaru STI Brembo
Rear Axles: R180 STI
Hubs: STI
Control Arms: Included as pictured
Condition: Used JDM
Origin: Japan
Item ID: 253984
Actual Product Photos: Yes
Installation: Available
Shipping: Nationwide Freight

PACKAGE INCLUDES

This JDM Subaru STI package includes:

• Complete front STI subframe
• Complete rear STI subframe
• OEM Subaru STI front Brembo brake calipers
• OEM Subaru STI rear Brembo brake calipers
• R180 limited-slip rear differential
• R180 rear axles
• Front hubs
• Rear hubs
• Front lower control arms
• Rear suspension arms
• Factory mounting components as pictured
• Additional suspension and drivetrain components shown in the actual inventory photos

The live inventory listing confirms these components as part of Item ID 253984.

Only components shown in the actual product photos or specifically identified in the listing should be considered included.

R180 LIMITED-SLIP REAR DIFFERENTIAL

One of the most valuable components in this package is the Subaru STI R180 limited-slip rear differential.

The R180 is substantially associated with Subaru’s higher-performance STI drivetrain and is commonly sought for:

• STI restorations
• WRX-to-STI conversions
• 6-speed drivetrain swaps
• Higher-power Subaru builds
• Track cars
• Rally applications

This particular package is identified with a:

3.54 Final Drive

The differential ratio is especially important when completing a Subaru AWD drivetrain conversion.

3.54 FINAL DRIVE – IMPORTANT

The live product data identifies this R180 differential with a:

3.54 final-drive ratio.

The rear differential ratio must properly match the transmission/drivetrain configuration.

Do not install an R180 differential based only on physical fitment.

Always verify:

• Transmission code
• Transmission final drive
• Rear differential ratio
• Tire diameter
• Front differential configuration
• Center differential configuration
• Complete AWD drivetrain setup

An incorrect front-to-rear final-drive relationship can cause serious AWD drivetrain damage.

STI R180 AXLES

The package includes compatible STI rear axles for the R180 differential.

This is important because an R180 conversion may require different rear axle components compared with a standard WRX R160-based drivetrain.

Using the matching components can simplify a properly planned STI drivetrain conversion.

Before installation, inspect:

• Inner CV joints
• Outer CV joints
• Splines
• CV boots
• Axle shafts
• ABS-related components
• Wheel-hub interfaces

OEM SUBARU STI BREMBO BRAKES

This package includes the desirable OEM Subaru STI Brembo brake system.

STI Brembo components provide a significant braking upgrade compared with many standard WRX brake configurations.

The package includes:

• Front Brembo calipers
• Rear Brembo calipers
• Related hub and suspension components as pictured

Before installation, inspect all used brake components.

IMPORTANT USED BRAKE COMPONENT NOTICE

Brake calipers, rotors, pads, hoses, hardware, and related braking components are safety-critical parts.

Before installation:

• Inspect caliper bodies.
• Inspect piston operation.
• Inspect dust boots.
• Inspect seals.
• Check bleeder screws.
• Inspect brake hoses.
• Inspect rotors.
• Measure rotor thickness.
• Inspect pads.
• Check mounting hardware.

Replace worn or questionable components before operating the vehicle.

STI HUB ASSEMBLIES

STI hub assemblies are included as pictured.

Before ordering, verify the exact:

• Bolt pattern
• Hub configuration
• Wheel-bearing condition
• ABS sensor arrangement
• Axle spline configuration
• Brake rotor compatibility

Do not assume compatibility solely from the vehicle model year.

FRONT STI SUBFRAME

The front STI subframe provides the structural mounting foundation for several suspension and drivetrain components.

Depending on the exact configuration shown, attached components may include:

• Lower control arms
• Hubs
• Knuckles
• Suspension arms
• Brake components
• Mounting brackets
• Additional hardware

Inspect all bushings, ball joints, bearings, and mounting points before installation.

REAR STI SUBFRAME

The rear STI subframe supports the rear suspension and drivetrain assembly.

This package combines the rear subframe with the desirable R180 drivetrain components, helping simplify a complete STI conversion.

Inspect:

• Subframe mounting points
• Bushings
• Differential mounts
• Suspension arms
• Hubs
• Bearings
• Axles
• Fasteners
• Brake components

before installation.

WRX-TO-STI CONVERSION

This package can provide many of the major components required for a properly planned WRX-to-STI suspension, brake, hub, and R180 drivetrain conversion.

However, it should not be advertised as a universal direct bolt-in conversion.

Depending on the donor and recipient vehicle, additional parts or modifications may be required.

These can include:

• STI-compatible transmission
• Correct driveshaft
• Matching rear differential ratio
• Wheel and tire changes
• Brake lines
• ABS components
• Parking-brake components
• Sensors
• Wiring
• Suspension components
• Mounting hardware
• Alignment
• DCCD-related components
• Additional drivetrain components

TRANSMISSION COMPATIBILITY

The current product data says:

Gears: For 6-Speed Transmission

This wording should be changed.

The subframe does not have gears, and the package itself does not include the transmission according to the current listing.

A better structured field is:

Drivetrain Compatibility: STI 6-Speed / 3.54 R180 Configuration

A related J-Spec GRB STI drivetrain package uses the TY856UB1KA 6-speed DCCD transmission paired with a 3.54 R180 differential, which helps establish the drivetrain relationship.

However, customers should always verify their exact transmission code and final-drive requirements.

IDEAL FOR STI RESTORATION

This package can also provide an excellent foundation for restoring a damaged or incomplete 2008–2014 WRX STI.

Possible uses include:

• Collision repair
• Damaged subframe replacement
• Missing drivetrain components
• Brake restoration
• Suspension restoration
• R180 differential replacement
• Hub replacement
• Axle replacement

Because the components come together as a package, builders can reduce the difficulty of sourcing individual STI components separately.

IDEAL FOR PERFORMANCE BUILDS

Subaru enthusiasts commonly seek STI drivetrain and suspension components when building higher-performance WRX-based vehicles.

The package provides a strong starting point for:

• Street performance builds
• Track cars
• Time-attack builds
• Rally cars
• Autocross vehicles
• High-horsepower WRX projects
• STI conversions

JDM-TO-USDM FITMENT

These components come from a Japanese-market Subaru application.

Some JDM and USDM external components may differ.

Before installation, compare the JDM package with the recipient vehicle.

Verify:

• Chassis
• Model year
• Hub bolt pattern
• Wheel bearings
• ABS sensors
• Brake calipers
• Brake rotors
• Parking-brake components
• Front axles when applicable
• Rear axles
• R180 differential
• Differential ratio
• Driveshaft interface
• Suspension arms
• Subframe mounting points
• Transmission final drive

Transfer compatible original components when required.

ACTUAL PRODUCT PHOTOS

The photographs on this product page represent the actual Item ID 253984 being offered for sale.

Use the photos to examine:

• Front subframe
• Rear subframe
• R180 differential
• Differential housing
• Brembo calipers
• Axles
• Hubs
• Control arms
• Suspension arms
• Bushings
• Mounting points
• Surface condition
• Included hardware

You will receive the components shown and specifically included in the listing.

USED JDM COMPONENT INSPECTION

Because these are used suspension, drivetrain, hub, and brake components, a qualified technician should inspect them before installation.

Inspect:

• Wheel bearings
• Ball joints
• Bushings
• Axle CV joints
• CV boots
• Differential seals
• Differential mounts
• Brake calipers
• Brake pads
• Brake rotors
• Brake hoses
• ABS sensors
• Control arms
• Suspension arms
• Subframe mounting points
• Fasteners

Replace worn service items as needed.

R180 DIFFERENTIAL SERVICE BEFORE INSTALLATION

Before operating the vehicle, service the R180 differential.

Recommended preparation includes:

• Drain old differential oil.
• Inspect the drained oil for metal contamination.
• Inspect axle seals.
• Inspect pinion seal.
• Inspect differential mounts.
• Check for excessive bearing play.
• Refill with the correct Subaru-approved gear oil.
• Verify proper fluid level.

PROFESSIONAL INSTALLATION RECOMMENDED

This package involves major suspension, brake, hub, axle, differential, and AWD drivetrain components.

Professional installation is strongly recommended.

After installation:

• Torque all suspension hardware correctly.
• Bleed the braking system.
• Verify brake operation.
• Verify ABS operation.
• Check differential fluid.
• Check axle installation.
• Verify wheel-bearing condition.
• Inspect all drivetrain fasteners.
• Perform a four-wheel alignment.
• Road test the vehicle carefully.

WHY CHOOSE THIS JDM STI SUBFRAME PACKAGE?

This package combines several desirable STI components into one inventory item.

Key features include:

• Genuine JDM Subaru STI components
• 2008–2014 STI application
• Front subframe
• Rear subframe
• R180 limited-slip differential
• 3.54 final drive
• STI R180 axles
• OEM Brembo brake calipers
• STI hubs
• Control arms
• Suspension components
• Actual inventory photographs
• Nationwide freight shipping
• Installation available

WHY BUY FROM J-SPEC AUTO SPORTS?

J-Spec Auto Sports has specialized in Japanese engines, transmissions, differentials, drivetrain assemblies, and performance components for more than 20 years.

Customers benefit from:

• Actual inventory photographs
• Individual Item IDs
• JDM Subaru drivetrain expertise
• Nationwide freight shipping
• Local Richmond / Henrico, Virginia pickup
• Installation options
• Large selection of Subaru STI drivetrain components

INDIVIDUAL INVENTORY INFORMATION

Vehicle: Subaru WRX STI
Years: 2008–2014
Generation: GRB / GVB STI Family
Package: Front & Rear Subframe Assembly
Rear Differential: R180 LSD
Final Drive: 3.54
Brakes: OEM STI Brembo
Axles: R180 STI Rear Axles
Hubs: STI Hubs
Control Arms: Included as pictured
Condition: Used JDM
Item ID: 253984

FREQUENTLY ASKED QUESTIONS

What is included in this Subaru STI package?

The package includes front and rear STI subframes, OEM Brembo brake calipers, an R180 limited-slip differential, rear axles, hubs, control arms, suspension arms, and additional components shown in the actual photos.

What is the rear differential?

This package includes an R180 limited-slip rear differential.

What is the final-drive ratio?

The current inventory data identifies the final drive as 3.54.

Does it include Brembo brakes?

Yes. The package includes OEM Subaru STI Brembo brake calipers.

Does it include front and rear subframes?

Yes. Both front and rear STI subframe assemblies are included.

Are axles included?

Yes. Rear axles are included according to the current listing.

Are the hubs included?

Yes. Front and rear hubs are listed among the included components.

Does it include control arms?

Yes. Front lower control arms and rear suspension arms are included according to the current inventory description.

Does this package include a transmission?

No transmission is listed as included with Item ID 253984. The product should therefore not be described as a complete transmission swap package.

Is this for a 6-speed STI drivetrain?

The current listing identifies the package as intended for a 6-speed transmission configuration and pairs the R180 with a 3.54 final drive. Exact transmission compatibility must be verified before installation.

Will this convert my WRX into an STI drivetrain?

It provides many of the major suspension, braking, hub, axle, and rear differential components needed for an STI-style conversion. However, additional components may be required depending on the recipient vehicle.

Is this a direct bolt-in conversion?

Do not assume universal bolt-in fitment. Verify the recipient chassis, model year, hub configuration, ABS system, transmission, driveshaft, differential ratio, and other related components.

What wheel bolt pattern does it use?

Verify the actual hubs on Item ID 253984 before advertising a bolt pattern. Do not assume the pattern solely from the year range.

Are the brake pads and rotors guaranteed usable?

Used pads and rotors should always be inspected before installation. Replace any component that fails service specifications.

Are the photos of the actual package?

Yes. The current J-Spec listing uses actual product photos for Item ID 253984.

Does J-Spec Auto Sports offer installation?

Yes. The product page currently states that affordable installation is available.

Does J-Spec Auto Sports ship nationwide?

Yes. Freight shipping is available for large drivetrain and suspension assemblies.

ORDER YOUR JDM SUBARU WRX STI SUBFRAME & R180 PACKAGE

Upgrade your Subaru with this JDM 2008–2014 Subaru WRX STI complete front and rear subframe assembly featuring an R180 3.54 LSD, OEM Brembo brakes, STI axles, hubs, control arms, and supporting suspension components.

Vehicle: Subaru WRX STI
Years: 2008–2014
Package: Front & Rear Subframe Assembly
Rear Differential: R180 LSD
Final Drive: 3.54
Brakes: OEM STI Brembo
Axles: STI R180
Hubs: STI
Item ID: 253984

Verify the recipient vehicle’s chassis, transmission final drive, hub configuration, axles, ABS system, brake components, driveshaft requirements, and complete drivetrain configuration before ordering.