JDM SUBARU WRX STI GRB TY856UB1KA 6-SPEED DCCD COMPLETE DRIVETRAIN SWAP PACKAGE

Upgrade your Subaru with a genuine JDM TY856UB1KA 6-speed manual DCCD drivetrain package from the GR-generation Subaru WRX STI platform.

Instead of purchasing only a transmission, this package combines many of the critical STI drivetrain and braking components needed for a correctly planned 6-speed conversion. As a result, it is particularly attractive for WRX owners, STI restorations and custom Subaru performance builds.

At the center of the package is the:

TY856UB1KA

6-speed manual AWD transmission.

In addition, the package includes an R180 Torsen rear differential, STI Brembo brake components, 5×114.3 hubs, rear axles, 6MT shifter assembly, starter and supporting drivetrain parts shown in the actual inventory photographs.

The primary product relationship is:

Subaru WRX STI → GRB / GRB-GVB Era → TY856UB1KA → 6-Speed Manual → DCCD → AWD → R180 Torsen Differential → 5×114.3 Hubs → Brembo Brakes

QUICK DETAILS

• Manufacturer: Subaru
• Donor Platform: WRX STI
• Chassis Family: GRB / GRB-GVB Era
• Years: 2008–2014
• Transmission Code: TY856UB1KA
• Serial Number: TY856UB1KA 127341
• Transmission Family: TY856
• Transmission Type: Manual
• Gears: 6
• Center Differential: DCCD
• Drivetrain: AWD
• Transmission Final Drive: 3.90 – verify physically
• Transfer Ratio: 1.10 – verify physically
• Rear Differential: R180 Torsen LSD
• Rear Differential Ratio: 3.54 – verify physically
• Hub Pattern: 5×114.3
• Brembo Brakes: Included
• Front Hubs: Included
• Rear Hubs: Included
• Rear Axles: Included
• Shifter Assembly: Included
• Starter: Included
• Condition: Used OEM JDM / Low Mileage
• Origin: Japan
• Item ID: 253904
• SKU: TY856UB1KA 6MT040
• Warranty: 30 Days
• Shipping: Nationwide Freight
• Installation: Available
• Local Pickup: Richmond / Henrico, Virginia

TY856UB1KA 6-SPEED MANUAL TRANSMISSION

The most important identifier on this package is:

TY856UB1KA

Subaru produced numerous TY856 6-speed transmissions. However, the complete suffix matters because different versions can use different:

• Gear ratios
• Final-drive arrangements
• Center differentials
• Front differentials
• DCCD systems
• Rear differentials
• Axles
• Sensors
• Hubs
• Vehicle applications

Therefore, do not identify this product only as:

TY856

Instead, use the complete transmission code:

TY856UB1KA

throughout the product title, specifications, FAQ, images and structured product data.

6-SPEED MANUAL / 6MT

This transmission uses six forward gears and belongs to Subaru’s performance-oriented TY856 manual transmission family.

The commonly published TY856UB1KA gear ratios are approximately:

• 1st: 3.636
• 2nd: 2.375
• 3rd: 1.761
• 4th: 1.346
• 5th: 1.062
• 6th: 0.842

Because these ratios identify a specific TY856 configuration, they should only be published once the physical transmission code has been confirmed as TY856UB1KA.

DCCD – DRIVER CONTROLLED CENTER DIFFERENTIAL

A major feature of this transmission is Subaru’s:

DCCD – Driver Controlled Center Differential

Unlike a conventional non-DCCD Subaru 6MT, this transmission incorporates an electronically controlled center differential system.

As a result, a conversion vehicle may require additional DCCD-related electronics and control hardware.

Depending on the target vehicle, installation may require:

• Factory-compatible DCCD electronics
• DCCD controller
• Wiring
• Sensors
• Switches
• Center differential control inputs
• Correct ABS / wheel-speed information

Therefore, do not market this transmission as universally plug-and-play in a non-STI WRX.

TY856UB1KA vs. NON-DCCD TY856 TRANSMISSIONS

Do not confuse TY856UB1KA with Legacy Spec B non-DCCD transmissions such as:

TY856WBEAA

Both belong to the TY856 6-speed family. Nevertheless, the center differential systems are different.

This page should rank for:

• TY856UB1KA
• STI DCCD transmission
• GRB STI 6-speed
• Subaru DCCD 6MT

Your Legacy Spec B pages should separately target:

• Non-DCCD 6MT
• TY856WBEAA
• Legacy Spec B transmission

This separation improves both technical accuracy and SEO.

GRB / GVB SUBARU WRX STI APPLICATION

The TY856UB1KA is associated with the JDM GR-generation Subaru WRX STI platform.

The current package listing covers:

2008–2014

However, chassis and model designations changed during this generation.

Therefore, the safest wording is:

2008–2014 GRB / related GR-GV generation JDM Subaru WRX STI applications

rather than suggesting that every 2008–2014 vehicle carries the exact same chassis code.

VERSION 10 / V10 TERMINOLOGY

Subaru enthusiasts commonly search for:

GRB STI V10

and:

Version 10 STI transmission

For search visibility, those terms can remain in the copy.

However, the strongest technical identifier is still:

TY856UB1KA

Therefore, exact transmission-code SEO should take priority over informal version terminology.

TRANSMISSION FINAL DRIVE vs. REAR DIFFERENTIAL RATIO

This is the most important correction needed on the current product page.

The existing structured field shows:

Final Drive: 3.54

However, older J-Spec TY856UB1KA documentation separates the drivetrain specifications as:

Transmission Final Drive: 3.90

Transfer Ratio: 1.10

Rear Differential Ratio: 3.54

These values work together in the STI AWD system.

Therefore, the page should not simply label 3.54 as the transmission final drive.

Recommended structured data:

Transmission Final Drive: 3.90

Transfer Ratio: 1.10

Rear Differential: R180 Torsen LSD

Rear Differential Ratio: 3.54

Most importantly, physically verify Item ID 253904 before publishing the corrected values.

R180 TORSEN REAR DIFFERENTIAL

The package includes a Subaru STI:

R180 Torsen Limited-Slip Rear Differential

The R180 is a major part of the STI drivetrain package and should remain prominently featured in the product title and description.

Before installation, verify:

• Differential housing
• Identification
• 3.54 ratio
• LSD configuration
• Axle outputs
• Input flange
• Pinion seal
• Axle seals
• Bearings
• Mounting points

Additionally, photograph the identification marks on the actual differential.

FRONT HELICAL LSD – VERIFY THIS UNIT

Other J-Spec TY856UB1KA listings identify this transmission configuration as using a:

Front Helical LSD

That is a valuable performance feature.

However, because this exact live Item ID 253904 does not currently list the front LSD in its structured specifications, physically verify the transmission before adding:

Front Differential: Helical LSD

Once confirmed, this should become a product attribute and SEO term.

COMPLETE STI SWAP PACKAGE

The live listing confirms that the package includes major STI conversion components.

Confirmed components include:

• TY856UB1KA 6-Speed Manual DCCD Transmission
• DCCD Center Differential System
• R180 Torsen Rear Differential
• Rear Axles
• Front Hubs
• Rear Hubs
• Front Brembo Brake Calipers
• Rear Brembo Brake Calipers
• 6MT Shifter Assembly
• Starter
• 5×114.3 Hub Components
• Additional drivetrain components shown in the actual photographs

Because this is a used complete drivetrain set, buyers should review every image before ordering.

5×114.3 STI HUB CONVERSION

The package includes STI:

5×114.3 hub components

This is a major consideration when converting a standard WRX drivetrain to STI specifications.

The 5×114.3 configuration affects:

• Wheels
• Hubs
• Bearings
• Brake rotors
• Axles
• Suspension compatibility
• ABS components

Therefore, customers should verify whether their current wheels and suspension components are compatible.

FRONT AND REAR STI BREMBO BRAKES

This package includes OEM Subaru STI Brembo brake calipers.

The Brembo system is a valuable part of a comprehensive STI conversion because it complements the upgraded transmission and drivetrain components.

Before installation, inspect each caliper for:

• Fluid leakage
• Piston movement
• Dust boot damage
• Bleeder condition
• Thread damage
• Mounting surfaces
• Corrosion

Additionally, verify the correct:

• Rotors
• Pads
• Brake lines
• Mounting hardware
• Hub configuration

before installation.

REAR AXLES INCLUDED

Matching rear axles are included with this package.

This matters because converting to an R180 differential frequently requires compatible R180 axle components.

Before installation, inspect:

• CV boots
• Inner joints
• Outer joints
• Splines
• Shaft condition
• Excessive play
• Grease leakage

VERIFY FRONT AXLES

The current live package specifically confirms rear axles, while the title broadly refers to axles.

Therefore, do not automatically state that front axles are included unless Item ID 253904 physically contains them.

If front axles are present, add:

Front Axles: Included

to the product data.

6MT SHIFTER ASSEMBLY INCLUDED

The package includes a 6-speed shifter assembly.

This is particularly important for customers converting from a 5-speed WRX transmission because the original 5MT shifter assembly is not necessarily the correct setup for the STI 6MT.

Inspect:

• Shift lever
• Linkage
• Shifter stay
• Bushings
• Hardware
• Joint condition

before installation.

STARTER INCLUDED

The live listing includes the starter.

Before installation, verify:

• Starter fitment
• Pinion condition
• Electrical terminal condition
• Mounting configuration

If the target vehicle requires a different starter configuration, reuse the correct original component.

VERIFY THE DRIVESHAFT

The current Item ID 253904 package description does not clearly state that a 6MT driveshaft is included.

Therefore, do not promise one.

A previous J-Spec TY856UB1KA package specifically noted that the driveshaft was missing.

Before selling this package as a complete conversion, physically verify whether Item ID 253904 includes:

6-Speed Driveshaft

If it is present, add it prominently.

If it is missing, state:

6MT Driveshaft Not Included – Must Be Sourced Separately

This is important because driveshaft length and flange configuration can differ between 5MT and 6MT setups.

WRX 5MT-TO-STI 6MT CONVERSION

This package is an excellent foundation for a properly planned Subaru WRX 5-speed-to-6-speed drivetrain conversion.

However, a complete swap may require more than the components in this package.

Depending on the target vehicle, additional requirements may include:

• Clutch
• Flywheel
• Driveshaft
• DCCD controller
• Wiring
• Transmission crossmember
• Mounts
• ABS-related components
• Wheels compatible with 5×114.3 hubs
• Brake rotors
• Brake lines
• Suspension parts
• ECU or control-system integration

Consequently, customers should plan the complete conversion before purchasing.

WRX STI REPLACEMENT APPLICATION

For a compatible 2008–2014 STI, this package may also provide a replacement drivetrain solution.

Nevertheless, verify:

• Original transmission code
• DCCD version
• Final drive
• Rear differential
• Hub pattern
• Axle configuration
• ABS system
• Sensors
• Wiring

before assuming direct interchange.

EJ207 PERFORMANCE APPLICATION

JDM GRB STI applications are closely associated with Subaru’s turbocharged EJ-series performance engines, including EJ207 applications.

Therefore, useful related search phrases include:

• EJ207 6-speed transmission
• EJ207 TY856UB1KA
• STI EJ207 transmission
• GRB EJ207 6MT

However, engine bellhousing compatibility alone does not establish complete drivetrain interchange.

EJ255 / EJ257 SWAP APPLICATIONS

The TY856 Subaru 6-speed platform is also frequently considered for EJ255 and EJ257 performance builds.

Potential searches include:

• EJ255 STI 6-speed swap
• EJ257 6-speed transmission
• WRX 6MT conversion

Nevertheless, all drivetrain components must be matched correctly.

DO NOT ADVERTISE A HORSEPOWER RATING

Avoid statements such as:

Good for 400 horsepower

or:

Handles 600 horsepower

unless J-Spec has independent engineering data supporting a specific rating.

Instead, use factual language:

Performance-oriented OEM Subaru STI 6-speed manual transmission used in WRX STI applications.

This is safer, more professional and more defensible.

TRANSMISSION / FRONT DIFFERENTIAL FLUID

The STI 6-speed transmission and front differential require the correct Subaru-approved gear lubricant.

Use a lubricant meeting Subaru’s specification for the exact TY856 application.

A commonly specified viscosity is:

SAE 75W-90

Before installation:

• Drain the existing transmission oil.
• Inspect the fluid.
• Check the magnetic drain plug.
• Clean accumulated debris.
• Replace sealing washers when appropriate.
• Refill with fresh correct-specification gear oil.

R180 DIFFERENTIAL FLUID

The rear R180 differential has its own separate gear-oil circuit.

Therefore:

• Drain the existing differential oil.
• Inspect for excessive metal.
• Clean the magnetic plug.
• Inspect seals.
• Refill with fresh Subaru-approved gear lubricant.

Do not reuse donor differential oil.

INSPECT THE CLUTCH AND FLYWHEEL

While the transmission is removed, inspect:

• Clutch disc
• Pressure plate
• Flywheel
• Pilot bearing
• Release bearing
• Clutch fork
• Pivot
• Slave cylinder

Because access is easy during installation, replacing worn components now can prevent significant labor later.

VERIFY CLUTCH CONFIGURATION

Before installation, verify:

• Clutch type
• Flywheel
• Release bearing
• Clutch fork
• Slave-cylinder location
• Starter engagement

Do not assume that the original WRX 5MT clutch setup will automatically work with the STI 6MT.

INSPECT TRANSMISSION SEALS

Inspect:

• Input/front seal area
• Front axle seals
• Output/driveshaft seal
• Shifter seals
• Drain plug
• Fill plug

Replace questionable accessible seals before installation.

INSPECT THE R180 DIFFERENTIAL

Before installing the rear differential, check:

• Axle seals
• Pinion seal
• Bearings
• Input flange
• Output splines
• Mounting bushings
• Drain plug
• Fill plug

Additionally, confirm the differential ratio before connecting the AWD drivetrain.

VERIFY DCCD ELECTRONICS

For a non-STI WRX conversion, DCCD integration deserves special attention.

Depending on the build, the installer may use:

• Factory STI DCCD control system
• Compatible aftermarket DCCD controller
• Vehicle-specific wiring solution

Do not operate the system under the assumption that the DCCD electronics are automatically compatible with the target vehicle.

VERIFY ABS AND WHEEL-SPEED SYSTEMS

A 5×114.3 STI hub conversion can interact with:

• ABS sensors
• Tone rings
• Wheel-speed signals
• Vehicle stability control
• DCCD inputs

Therefore, inspect the entire hub and sensor arrangement before installation.

ACTUAL PRODUCT PHOTOS

For a specialty package at this price point, actual detailed photographs are critical.

Photograph individually:

1. Complete swap package
2. TY856UB1KA transmission
3. TY856UB1KA transmission code
4. Serial TY856UB1KA 127341
5. Bellhousing
6. Input shaft
7. DCCD area
8. R180 differential
9. Differential identification
10. Rear axles
11. Front axles if included
12. Front hubs
13. Rear hubs
14. Front Brembo calipers
15. Rear Brembo calipers
16. Shifter assembly
17. Starter
18. Driveshaft if included
19. Subframes or control arms if included

These photographs improve customer confidence while also helping Google Images and AI search systems understand exactly what is being sold.

INITIAL INSTALLATION CHECKLIST

Before installation:

• Confirm TY856UB1KA transmission code.
• Confirm serial TY856UB1KA 127341.
• Confirm 6-speed manual configuration.
• Confirm DCCD.
• Verify transmission final drive.
• Verify transfer ratio.
• Verify R180 differential.
• Verify rear differential ratio.
• Confirm front and rear drivetrain compatibility.
• Verify front differential type.
• Inspect transmission oil.
• Inspect rear differential oil.
• Replace both fluids.
• Inspect input shaft.
• Inspect clutch.
• Inspect flywheel.
• Inspect pilot bearing.
• Inspect release bearing.
• Inspect transmission seals.
• Inspect R180 seals.
• Inspect rear axles.
• Verify front axles if included.
• Inspect front hubs.
• Inspect rear hubs.
• Confirm 5×114.3 wheel compatibility.
• Inspect Brembo calipers.
• Verify brake rotors.
• Verify ABS sensors.
• Verify wheel-speed sensors.
• Verify DCCD electronics.
• Verify transmission mount.
• Verify crossmember.
• Verify shifter assembly.
• Verify driveshaft.
• Verify starter.
• Check all wiring.
• Check for leaks.

INITIAL ROAD TEST

Begin with a conservative road test.

Monitor:

• 1st gear engagement
• 1–2 shift
• 2–3 shift
• 3–4 shift
• 4–5 shift
• 5–6 shift
• Downshifts
• Reverse engagement
• Synchronizer operation
• Gear whine
• Bearing noise
• Gear pop-out
• Clutch engagement
• Shifter movement
• Driveshaft vibration
• Axle vibration
• Rear differential noise
• DCCD operation
• ABS operation
• Brake operation
• AWD binding
• Fluid leaks

Most importantly, stop driving immediately if severe drivetrain binding occurs.

COMMON SIGNS OF SUBARU STI 6MT PROBLEMS

Possible transmission-related symptoms include:

• Gear grinding
• Difficult shifting
• Synchronizer wear
• Gear pop-out
• Transmission whine
• Bearing noise
• Difficult Reverse engagement
• DCCD warning lights
• Shifter vibration
• Oil leaks
• Drivetrain clunking

However, similar symptoms may also result from:

• Clutch problems
• Release bearing
• Pilot bearing
• Driveshaft
• Axles
• Rear differential
• DCCD electronics
• Mounts
• Shifter bushings

Therefore, diagnose the complete drivetrain before replacing the transmission.

WHY CHOOSE THIS TY856UB1KA STI PACKAGE?

This is not simply a used Subaru transmission.

Instead, it combines many of the major components required to build a genuine STI-based drivetrain and brake conversion.

Key features include:

• Genuine Subaru OEM JDM drivetrain
• TY856UB1KA exact transmission code
• Serial TY856UB1KA 127341
• 6-speed manual
• DCCD center differential
• AWD
• R180 Torsen rear differential
• STI rear axles
• 5×114.3 hubs
• Front and rear STI Brembo brakes
• 6MT shifter assembly
• Starter
• Low-mileage Japanese import
• Actual inventory photographs
• 30-day limited warranty
• Nationwide freight shipping
• Affordable installation available

WHY BUY FROM J-SPEC AUTO SPORTS?

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

Customers benefit from:

• Actual inventory photography
• Exact transmission-code identification
• Individual serial tracking
• Subaru drivetrain experience
• Rare JDM performance inventory
• Complete drivetrain packages
• Nationwide freight shipping
• Local Richmond / Henrico pickup
• Installation availability
• Limited warranty coverage

INDIVIDUAL INVENTORY INFORMATION

Donor Platform: JDM Subaru WRX STI GRB / GR-GV Generation

Years: 2008–2014

Transmission Code: TY856UB1KA

Serial Number: TY856UB1KA 127341

Transmission Family: TY856

Transmission: 6-Speed Manual / 6MT

Center Differential: DCCD

Drivetrain: AWD

Transmission Final Drive: 3.90 – Verify Physically

Transfer Ratio: 1.10 – Verify Physically

Rear Differential: R180 Torsen LSD

Rear Differential Ratio: 3.54 – Verify Physically

Hub Pattern: 5×114.3

Front Hubs: Included

Rear Hubs: Included

Rear Axles: Included

Brembo Calipers: Front & Rear Included

Shifter Assembly: Included

Starter: Included

Item ID: 253904

SKU: TY856UB1KA 6MT040

Condition: Used OEM JDM / Low Mileage

Warranty: 30 Days

30-DAY LIMITED WARRANTY

This individual drivetrain package carries a 30-day limited warranty, subject to J-Spec Auto Sports’ current warranty terms and installation requirements.

For warranty documentation, retain records for:

• Correct transmission oil
• Rear differential oil
• Final-drive verification
• Clutch inspection
• DCCD installation
• Driveshaft verification
• Seal inspection
• Professional installation

FREQUENTLY ASKED QUESTIONS

What is the transmission code?

TY856UB1KA

What is the serial number?

TY856UB1KA 127341

How many gears does it have?

Six forward gears.

Is this a manual transmission?

Yes. It is a Subaru 6-speed manual / 6MT.

Does it have DCCD?

Yes.

This TY856UB1KA is a DCCD-equipped Subaru STI transmission.

What does DCCD mean?

DCCD stands for Driver Controlled Center Differential.

Is this a non-DCCD Legacy Spec B transmission?

No.

This TY856UB1KA is different from non-DCCD Legacy Spec B TY856 transmissions.

Is an R180 differential included?

Yes.

The live package includes an R180 Torsen limited-slip rear differential.

What is the R180 differential ratio?

The TY856UB1KA packages historically use a 3.54 R180 rear differential with the applicable transfer gearing.

Physically verify Item ID 253904 before shipment.

Is the transmission final drive 3.54?

The current page labels 3.54 as “Final Drive,” but older J-Spec TY856UB1KA specifications separate the values.

Recommended verified fields are:

Transmission Final Drive: 3.90

Transfer Ratio: 1.10

Rear Differential Ratio: 3.54

Are Brembo brakes included?

Yes.

The package includes front and rear Subaru STI Brembo brake calipers.

What is the hub bolt pattern?

5×114.3

Are hubs included?

Yes.

The live listing includes front and rear hubs.

Are rear axles included?

Yes.

Are front axles included?

Verify Item ID 253904 physically.

The current live package specifically lists rear axles, while the product title broadly references axles.

Is the shifter included?

Yes.

A 6MT shifter assembly is included.

Is the starter included?

Yes.

Is the driveshaft included?

Verify the current physical inventory.

Do not assume it is included unless pictured and specifically listed.

Can this be used for a WRX 5-speed-to-6-speed swap?

Yes, it provides an excellent foundation for a properly planned WRX-to-STI 6MT conversion.

However, additional components or wiring may be required.

Do I need a DCCD controller?

A non-STI conversion generally requires a compatible solution for DCCD control.

Verify the complete electrical strategy before installation.

Will my WRX 5×100 wheels fit the STI 5×114.3 hubs?

Not directly if the wheel bolt pattern differs.

A 5×114.3 hub conversion requires compatible wheels and associated components.

Is the R180 the same as a WRX R160?

No.

The R180 and R160 are different Subaru rear differential platforms.

Does this have a front helical LSD?

Other TY856UB1KA J-Spec listings identify this configuration with a front helical LSD.

Physically verify Item ID 253904 before adding that specification to the live page.

Can this work with an EJ207?

It is closely associated with JDM STI EJ-series performance applications, including EJ207 builds.

However, complete drivetrain compatibility must still be verified.

Can it be used with an EJ255 or EJ257?

It may be used in correctly planned Subaru performance builds, but transmission fitment involves much more than engine compatibility.

What transmission oil should be used?

Use Subaru-approved manual transmission/front differential gear oil meeting the specification for the exact TY856 application.

Does the R180 use separate fluid?

Yes.

The rear differential has its own separate gear-oil circuit.

Should old transmission and differential oil be reused?

No.

Drain, inspect and refill both components with fresh correct-specification lubricants.

Is this transmission rebuilt?

No.

Unless specifically stated otherwise, this is a used OEM JDM Subaru transmission.

Does the package have a warranty?

Yes.

The current listing carries a 30-day limited warranty.

ORDER YOUR JDM SUBARU STI TY856UB1KA 6MT DCCD PACKAGE

Build your Subaru around a genuine JDM STI drivetrain with this TY856UB1KA 6-speed DCCD swap package.

The package includes major STI performance components such as:

TY856UB1KA 6-Speed DCCD Transmission

R180 Torsen Rear Differential

5×114.3 Front and Rear Hubs

Rear Axles

Front and Rear Brembo Brake Calipers

6MT Shifter Assembly

Starter

Transmission Code: TY856UB1KA

Serial Number: TY856UB1KA 127341

Item ID: 253904

SKU: TY856UB1KA 6MT040

Warranty: 30 Days

Before ordering, verify the target vehicle, transmission code, DCCD electronics, final-drive arrangement, rear differential ratio, clutch, flywheel, driveshaft, axles, hubs, ABS sensors, wheel pattern, suspension, brake components, mounts and complete physical configuration.