JDM 2008–2014 Subaru WRX STI TY856UB1KA 6-Speed Manual Transmission w/ R180 Differential & 4 Axles – 3.54 Final Drive

Upgrade your Subaru with a complete JDM WRX STI 6-speed manual AWD drivetrain package imported directly from Japan.

This package came from a JDM Subaru WRX STI equipped with the EJ207 Version 10 2.0L Twin AVCS turbo engine and includes the TY856UB1KA 6-speed manual transmission, matching R180 rear differential, and all four axles.

The drivetrain features a 3.54 final drive ratio, making it important to keep the transmission and rear differential properly matched.

An excellent package for a compatible WRX STI replacement, WRX-to-STI 6-speed conversion, EJ207 build, or Subaru performance drivetrain swap.

🔥 DRIVETRAIN SPECIFICATIONS

• Transmission Code: TY856UB1KA
• Transmission Type: 6-Speed Manual
• Drivetrain: AWD
• Final Drive Ratio: 3.54
• Rear Differential: R180
• Original Application: JDM Subaru WRX STI
• Engine Application: EJ207 Version 10 2.0L Turbo
• Front Axles: Left & Right Included
• Rear Axles: Left & Right Included
• Total Axles: 4
• Market: Japanese Domestic Market
• Condition: Used JDM Drivetrain
• Warranty: 30 Days

📦 COMPLETE STI 6-SPEED DRIVETRAIN PACKAGE

This package includes:

✅ TY856UB1KA 6-Speed Manual Transmission
✅ R180 Rear Differential
✅ 3.54 Final Drive Ratio
✅ Front Left Axle
✅ Front Right Axle
✅ Rear Left Axle
✅ Rear Right Axle

This is a great option for customers looking for a more complete STI drivetrain package rather than purchasing the transmission, differential and axles separately.

⚙️ 3.54 FINAL DRIVE + R180 DIFFERENTIAL

This drivetrain is equipped with a 3.54 final drive ratio and includes the matching R180 rear differential.

Matching the transmission and rear differential correctly is extremely important on Subaru's AWD drivetrain.

⚠️ IMPORTANT AWD RATIO WARNING

DO NOT install this transmission with an incompatible rear differential ratio.

Using mismatched transmission and rear differential ratios can cause drivetrain binding and may result in serious damage to the transmission, center differential, rear differential and other AWD components.

This package includes the R180 rear differential intended to be used with this drivetrain, helping keep the major AWD components together.

Your installer should still verify all drivetrain ratios and compatibility before operating the vehicle.

🏁 JDM STI 6-SPEED PERFORMANCE DRIVETRAIN

The Subaru STI 6-speed drivetrain is a highly desirable setup for Subaru performance applications.

This package is ideal for:

• WRX STI Transmission Replacement
• WRX-to-STI 6-Speed Conversion
• EJ207 Version 10 Builds
• JDM STI Conversions
• Subaru AWD Performance Builds
• Custom Subaru Drivetrain Swaps

With the TY856UB1KA transmission, R180 differential and all four axles included, this package provides many of the major components needed for a compatible STI drivetrain setup.

⚠️ IMPORTANT FITMENT INFORMATION

PLEASE VERIFY TRANSMISSION CODE TY856UB1KA BEFORE ORDERING.

This is a Japanese Domestic Market (JDM) drivetrain package and should not be assumed to be a direct plug-and-play replacement based solely on vehicle year or model.

Depending on your vehicle and application, differences may exist in:

• Driveshaft
• Transmission mounts
• Crossmember
• Shifter/linkage
• Clutch and flywheel
• Axle/hub configuration
• Wiring and connectors
• Sensors and switches
• ABS components
• Other drivetrain hardware

Some original USDM components may need to be transferred or modified for proper installation.

🔧 WRX-TO-STI CONVERSION INFORMATION

For customers performing a WRX-to-STI 6-speed swap, additional components may be required depending on the year and configuration of the vehicle.

The included components should not be considered a complete bolt-in conversion kit for every WRX.

Please have your installer verify compatibility of the:

✔ Transmission
✔ 3.54 Final Drive
✔ R180 Rear Differential
✔ Front & Rear Axles
✔ Driveshaft
✔ Hubs
✔ Clutch/Flywheel
✔ Shifter Assembly
✔ Transmission Mount/Crossmember
✔ Wiring & Sensors

⚠️ KEEP YOUR ORIGINAL DRIVETRAIN

DO NOT discard your original transmission, differential, axles, driveshaft, mounts, brackets, sensors, or other drivetrain components until installation is complete and the vehicle has been successfully road tested.

Your installer may need components from the original vehicle to complete the installation.

🛠️ PROFESSIONAL INSTALLATION RECOMMENDED

Installation should be performed by a qualified Subaru technician or performance shop familiar with STI 6-speed AWD drivetrains and JDM conversions.

Before installation, we recommend:

• Confirming TY856UB1KA transmission code
• Confirming 3.54 final drive ratio
• Confirming R180 differential compatibility
• Inspecting transmission seals
• Inspecting differential seals
• Replacing transmission fluid
• Replacing rear differential fluid
• Inspecting all four axles and CV boots
• Inspecting clutch and flywheel
• Inspecting release/throw-out bearing
• Checking transmission mounts
• Confirming driveshaft compatibility
• Confirming axle and hub compatibility

📸 WHAT YOU SEE IS WHAT YOU GET

Please review all listing photos carefully before ordering.

Package includes:

1 × TY856UB1KA 6-Speed Manual Transmission
1 × R180 Rear Differential
2 × Front Axles
2 × Rear Axles

Any additional sensors, switches, brackets, mounts, shifter components or accessories shown are considered convenience items unless specifically stated otherwise.

🛡️ 30-DAY WARRANTY

This drivetrain package includes a 30-day warranty covering the transmission and rear differential assemblies.

External accessories and components are not covered unless specifically stated.

Warranty does not cover damage resulting from:

• Improper installation
• Mismatched final drive/differential ratios
• Incorrect or insufficient fluid
• Racing or competition use
• Abuse or improper operation
• Modification
• Installation-related damage
• Pre-existing vehicle problems
• Improper drivetrain conversion

Professional installation documentation may be required for warranty claims.

🚚 NATIONWIDE FREIGHT SHIPPING

We ship throughout the United States.

✔ Commercial/business delivery preferred
✔ Residential delivery: additional $95
✔ Rural/limited-access locations may have additional carrier fees
✔ Local pickup available
✔ Valid phone number required for freight delivery

📍 JDM WESTCOAST INC.

9716 Alburtis Ave
Santa Fe Springs, CA 90670

📞 562-222-1000
🌐 www.jdmwestcoast.com

🔴 PLEASE VERIFY FITMENT BEFORE ORDERING

For fitment assistance, provide your Year • Make • Model • VIN • Current Transmission Code.

JDM WRX STI • TY856UB1KA • 6-Speed Manual • 3.54 Final Drive • R180 Rear Differential • 4 Axles • EJ207 V10 Drivetrain • 30-Day Warranty