JDM SUBARU STI TY856WB1CA NON-DCCD 6-SPEED MANUAL SWAP PACKAGE

Upgrade a compatible Subaru drivetrain with this JDM Subaru STI TY856WB1CA 6-speed manual transmission swap package from J-Spec Auto Sports.

The package centers around the:

TY856WB1CA

6-speed manual transmission.

This gearbox is associated with an early JDM Subaru Impreza WRX STI configuration and uses a:

Non-DCCD center differential

combined with a:

Suretrac front limited-slip differential

and a matching:

3.90 R180 rear differential

For customers, installers, Google, Bing and AI search systems, the strongest technical entity is:

Subaru STI → TY856WB1CA → 6-Speed Manual → Non-DCCD → Suretrac Front LSD → 3.90 Final Drive → R180 3.90 Rear Differential → Brembo Brake / Drivetrain Swap Package

QUICK DETAILS

• Manufacturer: Subaru
• Original Platform: JDM Subaru Impreza WRX STI
• Transmission Code: TY856WB1CA
• Serial Number: TY856WB1CA 004612 – verify physical unit
• Transmission Type: 6-Speed Manual
• Gears: 6
• Center Differential: Non-DCCD
• Drivetrain: Full-Time AWD
• Front Differential: Suretrac LSD
• Front Final Drive: 3.90
• Rear Differential: R180 LSD
• Rear Differential Ratio: 3.90
• Item ID: 6MT032
• SKU: 6MT032 TY856WB1CA-4613
• Condition: Used OEM JDM
• Brembo Brake Components: Included as pictured
• Axles: Included as pictured
• Front Subframe: Included as pictured
• Rear Subframe: Included as pictured
• Actual Product Photos: Yes
• Nationwide Shipping: Available
• Installation: Available

TY856WB1CA TRANSMISSION CODE

The most important identifier on this package is:

TY856WB1CA

Use this exact full code throughout:

• Product title
• H1
• Product specifications
• Short description
• First paragraph
• Image ALT text
• Image titles
• FAQ
• Product schema
• Inventory records

Do not shorten the primary identity to:

TY856

Subaru produced numerous TY856 variants with meaningful differences in:

• Final drive
• Center differential
• DCCD configuration
• Front differential
• Gear ratios
• Axle interfaces
• Hubs
• Electronics
• Vehicle application

Therefore:

TY856WB1CA ≠ every other TY856 transmission

NON-DCCD CENTER DIFFERENTIAL

This TY856WB1CA package is listed as:

Non-DCCD

That means it does not use the driver-controlled electronic center-differential system found on many other STI 6-speed configurations.

Recommended wording:

Non-DCCD STI 6-Speed Manual

Do not imply that non-DCCD automatically means:

• Easier direct installation in every chassis
• Better reliability
• Better power handling
• Better performance

The primary benefit for a swap is that it avoids the additional DCCD controller and related driver-control wiring used by DCCD-equipped transmissions.

However, the complete mechanical drivetrain still must match correctly.

FULL-TIME AWD

The live specifications correctly identify this transmission as:

Full-Time AWD

The rear drive transfer ratio is listed as:

1.000:1

Keep AWD clearly separated from the transmission code and differential ratios.

SURETRAC FRONT LIMITED-SLIP DIFFERENTIAL

This TY856WB1CA package is listed with a:

Suretrac Front LSD

The live specification shows:

Ring Gear: 39 Teeth

Pinion: 10 Teeth

which produces:

3.900:1

Use:

Suretrac Front LSD

as a primary technical feature.

However, avoid promises such as:

• Dramatically improved handling
• Superior traction
• Track-ready performance
• Predictable cornering
• Better stability

unless those statements are appropriately framed as general differential characteristics rather than guaranteed results for the customer’s vehicle.

VERIFY “A.P. SURETRAC” WORDING

The live page repeatedly calls the differential:

A.P. Suretrac

Before making “A.P.” a major SEO term, physically verify any manufacturer or casting identification on the differential.

The technically important part is:

Suretrac Front LSD

If the actual component carries a clearly documented A.P. designation, retain it.

Otherwise, use:

Suretrac Front Limited-Slip Differential

rather than building SEO around an unverified manufacturer prefix.

3.90 TRANSMISSION FINAL DRIVE

The TY856WB1CA specifications on this listing identify:

Final Drive: 3.90

That matches the listed:

39-tooth ring gear / 10-tooth pinion

for a:

3.900:1 front final-drive ratio

Keep:

3.90 Final Drive

prominent throughout the page.

R180 3.90 REAR DIFFERENTIAL

The included rear differential is listed as:

R180

with:

3.90 Final Drive

This is critical for AWD drivetrain compatibility.

Recommended technical relationship:

TY856WB1CA 3.90 Transmission + Matching R180 3.90 Rear Differential

Do not separate these components during installation unless the replacement rear differential ratio is independently verified as compatible.

DO NOT CALL EVERY R180 AN LSD WITHOUT VERIFICATION

The live page calls the rear differential:

R180 LSD

That may be correct for this package, but physically verify the actual R180 type before describing the internal LSD mechanism.

Possible Subaru R180 configurations can differ.

Therefore:

R180 Rear Differential – 3.90 Ratio

is an absolute safe identification.

Use:

R180 LSD

only when LSD operation/type is physically confirmed.

Likewise, do not call it:

plated LSD

unless the physical differential has been identified as a plated unit.

GEAR RATIOS

The live TY856WB1CA data lists:

1st: 3.636
2nd: 2.375
3rd: 1.761
4th: 1.346
5th: 1.062
6th: 0.842
Reverse: 3.545

Recommended technical table:

1st Gear: 3.636
2nd Gear: 2.375
3rd Gear: 1.761
4th Gear: 1.346
5th Gear: 1.062
6th Gear: 0.842
Reverse: 3.545
Final Drive: 3.900

These values give search engines and AI systems excellent code-specific technical context.

CORRECT “FORTH” TO “FOURTH”

The live specification currently says:

Forth Gear Ratio

Change it to:

Fourth Gear Ratio

This is minor for fitment but improves professionalism and page quality.

REMOVE “SEVENTH GEAR”

The live WooCommerce specification table contains:

Seventh Gear Ratio

with no value.

Remove it.

This is a 6-speed transmission.

An empty seventh-gear field creates unnecessary technical noise for customers and search engines.

ORIGINAL STI APPLICATION VS. SWAP APPLICATION

Separate these two concepts clearly.

ORIGINAL TRANSMISSION ORIGIN

The TY856WB1CA is associated with an early JDM Impreza WRX STI / Version 7-era drivetrain configuration.

POTENTIAL SWAP APPLICATION

The package can be useful for converting certain:

2002–2007 Subaru WRX

vehicles from their original drivetrain to an STI 6-speed/R180/Brembo configuration.

Those are not the same thing.

Do not make the WooCommerce “Years” field:

2002–2007

look like those are necessarily the original donor-model years of TY856WB1CA.

Use separate fields:

Original Transmission Application: JDM STI Version 7-era

Common Swap Target: 2002–2007 Subaru Impreza WRX, after complete verification

2002–2007 SUBARU WRX SWAP

This package is particularly relevant to:

2002–2007 Subaru Impreza WRX

owners building an STI-style 6-speed drivetrain conversion.

However, do not say:

Direct fit

or:

Turn-key

without confirming every component needed for the specific chassis.

A complete WRX conversion may require:

• TY856WB1CA transmission
• Matching 3.90 R180 rear differential
• Appropriate rear axles
• Front axles
• Hubs
• Wheel bearings
• Driveshaft
• Transmission crossmember
• Transmission mount
• Shifter
• Shifter linkage
• Clutch
• Flywheel
• Starter compatibility
• Clutch hydraulics
• Brembo calipers
• Brake rotors
• Brake pads
• Brake lines
• Control arms
• Subframes
• ABS-related components
• Parking-brake components
• Compatible wheels

Verify exactly what Item 6MT032 includes before claiming a complete conversion.

FORESTER FITMENT

The live page lists:

2003–2008 Forester

as an application.

That is too broad as a direct-fit claim.

A Forester STI-style 6-speed swap may require chassis-specific changes involving:

• Driveshaft
• Shifter
• Transmission cradle
• Crossmember
• Hubs
• Axles
• Subframes
• Brake components
• ABS
• Wheel clearance

Older J-Spec TY856WB1CA listings themselves state that Forester applications can require modification.

Recommended WooCommerce wording:

2003–2008 Subaru Forester – Custom swap application; modifications required

Do not present Forester fitment as a simple factory replacement.

NOT A FACTORY WRX TRANSMISSION

The standard 2002–2007 U.S. WRX did not originally come with this exact STI TY856WB1CA package.

Therefore, describe WRX use as:

STI 6-Speed Conversion / Swap Application

not:

Replacement WRX Transmission

This distinction improves customer expectations and reduces fitment disputes.

5×100 HUB PATTERN

Several historical J-Spec TY856WB1CA Version 7 packages specifically identify:

5×100 STI hubs

That is an important swap feature.

However, this exact live Item 6MT032 description currently lists Brembos, axles and subframes without clearly stating that hubs are included.

Physically confirm:

• Front hubs
• Rear hubs
• Bolt pattern
• Wheel bearings
• Rotors
• Knuckles

before adding:

5×100 Hub Conversion

to this exact package.

Do not copy the included-parts list from another TY856WB1CA package without verifying Item 6MT032.

BREMBO BRAKE CALIPERS

The package includes:

STI Brembo Brake Calipers

according to the live listing.

Before shipping, document:

• Number of calipers
• Front calipers
• Rear calipers
• Condition
• Bleeder screws
• Mounting ears
• Brake-line threads

Do not promise:

• New pads
• Good rotors
• Fresh seals
• Ready-to-use brakes

unless inspected.

Used brake components should be inspected before installation.

ROTORS AND PADS

If rotors or pads appear in the photos, do not automatically include them as serviceable components.

Recommended wording:

Used rotors and pads, if included, should be inspected and replaced as necessary before installation.

AXLES

The live listing says:

Front and rear axles included

Verify the actual quantity.

Recommended product field:

Axles: Included as pictured – verify quantity and application

This is better than implying every axle required for every WRX/Forester swap is universally compatible.

SUBFRAMES

The listing says:

Front and rear subframes

are included.

Photograph them separately and use dedicated image metadata.

Before installation, inspect:

• Mounting points
• Rust/corrosion
• Bent components
• Bushings
• Weld areas
• Control-arm mounting locations

CONTROL ARMS

Several older TY856WB1CA packages from J-Spec included:

aluminum control arms

but Item 6MT032’s current “What’s Included” section does not explicitly list them.

Do not add control arms to Item 6MT032 unless they are physically included in its actual photos/inventory.

DRIVESHAFT

This is another critical point.

Older J-Spec TY856WB1CA packages often included a matching:

6-speed driveshaft

However, the current Item 6MT032 “What’s Included” section does not clearly list one.

Do not promise a driveshaft unless physically verified.

Recommended product data:

Driveshaft: Verify Included / Not Included

A 6-speed conversion frequently requires the appropriate driveshaft length/configuration.

SHIFTER ASSEMBLY

Likewise, verify whether the package includes:

• STI shifter
• Linkage
• Shifter stay
• Bushings
• Hardware

Do not assume these parts are included merely because the transmission is complete.

CLUTCH AND FLYWHEEL

Verify whether any clutch or flywheel is included.

Even if a used clutch is physically present, recommend installing a new compatible clutch before installation.

Verify:

• Clutch type
• Pressure plate
• Disc spline
• Flywheel
• Release bearing
• Fork
• Pivot
• Slave cylinder
• Clutch hydraulics

Do not reuse a worn clutch simply because it arrived with the transmission.

DCCD CONTROLLER NOT REQUIRED FOR CENTER CONTROL

Because this transmission is listed as non-DCCD, it does not require a DCCD controller for driver-controlled center differential adjustment.

However, this does not mean the entire vehicle conversion requires no electrical work.

Depending on the target car, installation may still require work involving:

• Neutral switch
• Reverse-light switch
• Speed signal
• ABS
• ECU
• Instrument cluster
• Wiring

Use:

No DCCD controller required for the non-DCCD center differential

instead of:

No wiring required

MANUAL TRANSMISSION FLUID

Use the correct Subaru-approved manual transmission/front differential gear oil for the exact TY856WB1CA application.

Because the transmission and front differential share lubricant in this 6MT configuration, fluid choice is especially important.

Use a Subaru-approved:

GL-5 gear oil of the correct viscosity/specification

for the transmission/front differential according to the applicable Subaru service information.

Do not automatically use GL-4 advice from Nissan manual-transmission applications.

Verify the exact Subaru service specification before filling.

REAR DIFFERENTIAL OIL

The R180 rear differential is serviced separately from the transmission.

Use the correct Subaru-approved differential gear oil based on the actual R180 LSD configuration.

If the rear differential uses a clutch-type LSD, confirm whether the selected oil requires an LSD friction-modifier specification.

Do not assume every R180 uses identical lubricant requirements.

INSPECT TRANSMISSION FLUID

Before installation:

• Drain existing oil.
• Inspect fluid.
• Inspect magnetic drain plugs.
• Look for excessive metal.
• Look for synchronizer debris.
• Check for water contamination.
• Check for unusual odor.

Abnormal debris should be evaluated before installation.

INSPECT FRONT DIFFERENTIAL

Because this transmission includes a Suretrac front LSD, inspect:

• Differential operation
• Ring gear
• Pinion
• Bearings
• Excessive backlash
• Metal debris
• Seal surfaces

Do not describe the front differential as “tested” unless J-Spec documents the actual inspection procedure.

INSPECT R180 REAR DIFFERENTIAL

Before installation:

• Drain oil.
• Inspect magnetic plug.
• Rotate inputs/outputs.
• Check bearing play.
• Inspect axle seals.
• Check flange condition.
• Verify 3.90 ratio.
• Confirm LSD configuration.

INPUT / OUTPUT INSPECTION

With the transmission out of the car, inspect:

• Input shaft
• Input spline
• Output surfaces
• Axle interfaces
• Bearings
• Seals

Check for abnormal play before installation.

SHIFT THROUGH ALL SIX GEARS

Manually verify selection of:

• Reverse
• First
• Second
• Third
• Fourth
• Fifth
• Sixth

Check for:

• Binding
• Incomplete engagement
• Selector issues
• Excessive looseness

This is an inspection step, not a substitute for a loaded road test.

DO NOT COMPRESSION TEST A TRANSMISSION

Do not use:

Compression Tested

anywhere on this product page.

Compression testing applies to engines.

For a manual transmission, advertise only the actual inspection completed by J-Spec, such as:

• Visual inspection
• Gear-selection inspection
• Fluid inspection
• Input/output rotation
• Case inspection
• Seal inspection

If the donor vehicle was actually running and driving before removal and J-Spec has documentation for this specific unit, that can be stated accurately.

REMOVE UNSUPPORTED PERFORMANCE CLAIMS

Remove statements such as:

Strong STI drivetrain durability

Improved stability

Enhanced cornering traction

Stronger clamping force

Excellent track or rally performance

High-performance solution

unless appropriately qualified.

A used drivetrain package should be sold primarily on:

• Actual code
• Actual ratio
• Actual components
• Actual serial
• Actual photos
• Condition
• Fitment
• Warranty
• J-Spec support

INSTALLATION CHECKLIST

Before installation:

• Verify TY856WB1CA.
• Verify actual serial number.
• Verify non-DCCD configuration.
• Verify 3.90 front final drive.
• Verify matching 3.90 R180 rear differential.
• Verify Suretrac front LSD.
• Confirm rear LSD type.
• Confirm target chassis.
• Confirm hub pattern.
• Confirm front axles.
• Confirm rear axles.
• Confirm hubs/knuckles if included.
• Confirm Brembo calipers.
• Confirm rotors if included.
• Confirm front subframe.
• Confirm rear subframe.
• Confirm control arms if included.
• Confirm driveshaft.
• Confirm transmission crossmember.
• Confirm transmission mount.
• Confirm shifter.
• Confirm shifter linkage.
• Confirm clutch.
• Confirm flywheel.
• Confirm starter compatibility.
• Confirm clutch hydraulics.
• Confirm ABS compatibility.
• Confirm parking-brake configuration.
• Confirm wheel clearance over Brembo calipers.
• Inspect seals.
• Inspect transmission fluid.
• Inspect R180 fluid.
• Fill with correct Subaru gear oil.
• Check all fasteners.
• Road-test gradually after installation.

INITIAL ROAD TEST

Begin with light load.

Monitor:

• Clutch engagement
• First-to-second shift
• Second-to-third shift
• Third-to-fourth shift
• Fourth-to-fifth shift
• Fifth-to-sixth shift
• Downshifts
• Synchronizer feel
• Gear noise
• Bearing noise
• Drivetrain binding
• Differential noise
• Axle vibration
• Driveshaft vibration
• Fluid leaks
• Brake operation
• ABS warning lights

Do not immediately perform:

• Hard launches
• Track driving
• Rally driving
• Clutch dumps
• High-RPM shifts

until correct drivetrain operation has been verified.

WHY CHOOSE ITEM 6MT032?

Item 6MT032 offers a rare JDM Subaru STI drivetrain package built around the:

TY856WB1CA non-DCCD 6-speed manual transmission

with major supporting drivetrain components.

Key features include:

• TY856WB1CA transmission
• Non-DCCD center differential
• 6-speed manual
• Suretrac front LSD
• 3.90 transmission final drive
• Matching 3.90 R180 rear differential
• STI Brembo brake components
• Axles
• Front and rear subframes
• Actual inventory photos
• Individual Item ID
• Nationwide freight shipping
• 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 photographs
• Individual transmission-code tracking
• Rare JDM Subaru drivetrain inventory
• Subaru swap experience
• Nationwide freight shipping
• Fitment assistance
• Local pickup
• Installation availability
• Limited warranty coverage when applicable

For a multi-component STI drivetrain conversion, confirming every included component before installation is especially important.

INDIVIDUAL INVENTORY INFORMATION

Make: Subaru

Original Platform: JDM Impreza WRX STI

Transmission Code: TY856WB1CA

Serial Number: TY856WB1CA 004612 – verify physical Item 6MT032

Type: 6-Speed Manual

Gears: 6

Center Differential: Non-DCCD

Drivetrain: AWD

Front Differential: Suretrac LSD

Front Final Drive: 3.90

Rear Differential: R180

Rear Final Drive: 3.90

Rear LSD Type: Verify physical unit

Brembo Brake Components: Included as pictured

Axles: Included as pictured

Front Subframe: Included as pictured

Rear Subframe: Included as pictured

Hubs: Verify Included / Not Included

Driveshaft: Verify Included / Not Included

Shifter: Verify Included / Not Included

Control Arms: Verify Included / Not Included

Clutch: Verify Included / Not Included

Flywheel: Verify Included / Not Included

Item ID: 6MT032

SKU: 6MT032 TY856WB1CA-4613

Condition: Used OEM JDM

Warranty: Verify current WooCommerce warranty field before hard-coding

WARRANTY

Sell Item 6MT032 subject to J-Spec Auto Sports’ current limited warranty terms.

Before hard-coding a warranty duration into permanent SEO fields, verify the current WooCommerce warranty field for this exact item.

For a drivetrain swap package, clearly define whether warranty coverage applies to:

• Transmission
• Front differential
• R180 differential
• Axles
• Brembo calipers
• Hubs
• Subframes
• Other included components

Keep installation records documenting:

• Correct transmission fluid
• Correct R180 fluid
• Ratio matching
• Axle installation
• Driveshaft installation
• Professional installation

FREQUENTLY ASKED QUESTIONS

What transmission code is included?

TY856WB1CA

Is this a 6-speed transmission?

Yes.

It is a:

6-speed manual transmission

Is TY856WB1CA DCCD?

This package is identified as:

Non-DCCD

Does it require a DCCD controller?

A DCCD controller is not required for electronic center-differential adjustment because this gearbox is non-DCCD.

Other vehicle wiring may still require modification during a swap.

What is the final-drive ratio?

3.90

What front differential does it have?

The transmission is listed with a:

Suretrac front limited-slip differential

What rear differential is included?

A:

R180 rear differential

with a:

3.90 ratio

is included.

Is the R180 an LSD?

The listing identifies it as an LSD. Verify the actual rear differential and LSD type before publishing more specific internal-differential claims.

Is this a Version 7 STI transmission?

TY856WB1CA is associated with early JDM STI / Version 7-era applications.

Use the exact transmission code as the primary identifier.

Will it fit a 2002–2007 WRX?

It is commonly used for STI 6-speed conversions in compatible 2002–2007 WRX chassis, but it is not simply a direct replacement for the original WRX transmission.

Complete drivetrain conversion parts must be verified.

Will it fit a Forester?

It may be used in certain Forester conversion projects, but modifications can be required.

Do not advertise universal direct fitment.

Does it include Brembo brakes?

The live Item 6MT032 listing says Brembo calipers are included.

Verify the actual quantity and all related brake components from the photos.

Are the hubs included?

Verify Item 6MT032 physically.

Do not assume hubs are included merely because older TY856WB1CA J-Spec packages included 5×100 hubs.

Is the driveshaft included?

Verify the actual Item 6MT032 inventory before advertising driveshaft inclusion.

Are the axles included?

The current listing says front and rear axles are included.

Verify the exact quantity and configuration before shipping.

Are the front and rear subframes included?

The current listing says both front and rear subframes are included.

Does it include a clutch?

Verify from the actual Item 6MT032 inventory.

A new compatible clutch is recommended for installation.

What transmission oil should I use?

Use the Subaru-approved gear oil specification for the TY856WB1CA transmission/front differential.

Verify the exact viscosity and specification using current Subaru service information before filling.

Does the rear differential use the same oil?

The R180 rear differential is serviced separately.

Use the correct gear oil for the actual rear LSD configuration.

Is this transmission compression tested?

No.

Manual transmissions are not compression tested.

Is it a direct bolt-in WRX transmission?

Do not assume direct bolt-in fitment.

This is an STI drivetrain conversion package and the required components depend on the target chassis.

ORDER ITEM 6MT032 – TY856WB1CA STI 6-SPEED SWAP PACKAGE

Upgrade a compatible Subaru with this JDM TY856WB1CA non-DCCD STI 6-speed manual drivetrain package.

Transmission Code: TY856WB1CA
Transmission: 6-Speed Manual
Center Differential: Non-DCCD
Front Differential: Suretrac LSD
Transmission Final Drive: 3.90
Rear Differential: R180
Rear Differential Ratio: 3.90
Brembo Brake Components: Included as pictured
Axles: Included as pictured
Subframes: Included as pictured
Item ID: 6MT032
SKU: 6MT032 TY856WB1CA-4613

This is a conversion package rather than a universal direct replacement.

Before ordering, verify the target chassis, transmission serial, hub pattern, axles, R180 ratio, driveshaft, hubs, subframes, Brembo brake components, shifter, clutch, flywheel, crossmember and all components shown in the actual Item 6MT032 photographs.

Nationwide freight shipping and installation are available through J-Spec Auto Sports.