Clean, Low-Mileage JDM Subaru TZ1B5LBZAA 4EAT Automatic Transmission for Sale

Replace your damaged or worn Subaru transmission with this clean, low-mileage JDM TZ1B5LBZAA 4EAT AWD automatic transmission from J-Spec Auto Sports. Imported from Japan, this genuine OEM Subaru gearbox is professionally inspected before shipping and is offered as a replacement option for select 2002–2005 Subaru Impreza WRX automatic models.

The TZ1B5LBZAA is a four-speed electronically controlled automatic transmission designed for Subaru’s all-wheel-drive platform. Available application references associate this transmission code with turbocharged EJ205-powered Subaru WRX and Forester models, while ratio references identify it as a 4.444 final-drive transmission. Because Subaru used several closely related 4EAT codes during this period, the complete transmission tag and rear differential ratio must be confirmed before installation.

Whether your original gearbox is slipping, shifting harshly, delaying engagement, leaking fluid, or experiencing internal mechanical failure, a low-mileage JDM replacement can provide a practical alternative to a costly rebuild. Moreover, using a genuine OEM Subaru transmission helps preserve factory mounting, drivetrain geometry, and AWD operation when the correct code and ratio are matched.

Transmission Features

• Genuine OEM Japanese Domestic Market transmission
• Transmission code: TZ1B5LBZAA
• Subaru four-speed electronic automatic transmission
• Commonly known as the Subaru 4EAT
• Symmetrical AWD configuration
• 4.444 final-drive ratio
• Designed for select turbocharged EJ205 applications
• Suitable for select 2002–2005 Subaru WRX models
• May fit additional JDM Forester applications
• Clean, low-mileage imported unit
• Professionally inspected before shipment
• Torque converter included when shown
• Fast nationwide freight shipping
• Expert fitment assistance
• 90-day limited warranty

Why Choose a Low-Mileage JDM Subaru Transmission?

Japanese vehicles are often removed from service at lower accumulated mileage than comparable vehicles in North America. Consequently, a properly inspected JDM transmission may offer less internal wear than many locally sourced used units.

Furthermore, this is a genuine Subaru transmission rather than an aftermarket replacement. Factory bellhousing dimensions, mounting locations, axle connections, and drivetrain components are therefore retained when the correct application is selected.

A used JDM gearbox can also be a cost-effective solution when rebuilding the original transmission is not practical. However, correct identification remains essential because Subaru produced numerous automatic transmissions that appear nearly identical externally.

Professionally Inspected

Before being approved for sale, each transmission is visually and mechanically inspected by the experienced team at J-Spec Auto Sports.

Inspection points may include:

• Transmission housing and bellhousing
• Input and output areas
• Front differential housing
• Torque-converter condition
• Fluid condition
• Oil pan
• Electrical connectors
• Speed sensors
• External solenoids
• Mounting points
• Axle openings
• External seals
• Signs of cracks or impact damage
• Overall physical condition

Additionally, the identification tag is checked so the transmission code can be compared with the buyer’s original unit.

Vehicle Compatibility

This transmission may be suitable for select automatic AWD applications, including:

Subaru Impreza WRX

• 2002 Subaru Impreza WRX 2.0L Turbo AWD Automatic
• 2003 Subaru Impreza WRX 2.0L Turbo AWD Automatic
• 2004 Subaru Impreza WRX 2.0L Turbo AWD Automatic
• 2005 Subaru Impreza WRX 2.0L Turbo AWD Automatic

Possible Additional JDM Applications

The TZ1B5LBZAA code is also associated in available application references with certain JDM Subaru Forester SG-series models equipped with the EJ205 engine. One existing J-Spec Auto Sports listing identifies it with 2003–2008 Forester applications, while other sellers associate the same code with earlier Forester and WRX models. Therefore, these broad year ranges should not replace transmission-tag verification.

Transmission Code: TZ1B5LBZAA
Transmission Type: Four-Speed Automatic — 4EAT
Drive Configuration: AWD
Final-Drive Ratio: 4.444
Common Engine Association: EJ205 2.0L Turbo
Market: Japanese Domestic Market

Critical Final-Drive Ratio Notice

This transmission is identified as having a 4.444 final-drive ratio. Therefore, the rear differential installed in the vehicle must have the corresponding ratio.

Do not install this transmission with an incompatible rear differential. A front-to-rear ratio mismatch can produce drivetrain binding, abnormal tire behavior, transfer-clutch stress, internal transmission damage, and rear differential damage.

Before installation, verify:

• Original transmission code
• Replacement transmission code
• Front differential ratio
• Rear differential ratio
• Vehicle VIN
• Engine type
• Connector configuration
• Speed-sensor configuration
• Torque-converter compatibility

Installation Recommendations

Professional installation by a Subaru-experienced technician is strongly recommended.

For maximum reliability, J-Spec Auto Sports recommends the following:

• Flush the transmission cooler thoroughly
• Flush or replace contaminated cooler lines
• Replace the front axle seals
• Inspect the rear output seal
• Inspect the torque-converter seal
• Inspect the driveshaft and carrier bearing
• Inspect both front CV axles
• Inspect the transmission mount
• Inspect the flexplate for cracks or damage
• Confirm torque-converter engagement before tightening the transmission
• Replace worn external seals while the unit is accessible
• Use the Subaru-approved automatic transmission fluid specified for the vehicle
• Verify the fluid level using the correct temperature and service procedure
• Clear stored transmission trouble codes
• Perform any required control-module reset or relearn
• Road-test the vehicle and check for leaks

Moreover, the transmission cooler must be cleaned before installation. Debris remaining from the failed original transmission can circulate into the replacement unit and cause immediate internal damage.

Components That May Need to Be Transferred

JDM and North American Subaru vehicles can differ in wiring, brackets, sensors, and calibration. As a result, the installer may need to transfer certain components from the original USDM transmission.

Depending on the vehicle, transfer items may include:

• Transmission wiring harness
• Neutral-safety or inhibitor switch
• Vehicle-speed sensors
• External solenoids
• Transmission brackets
• Transmission mount
• Shift linkage components
• Cooler-line fittings
• Dipstick tube
• Vent tubes
• Electrical connectors
• Torque converter, when required
• Valve body or control components, when applicable

Only transfer components after confirming that the parts are compatible and in serviceable condition.

Important Interchangeability Notice

A matching 4EAT designation does not automatically make two Subaru transmissions interchangeable.

Subaru automatic transmissions may differ in:

• Final-drive ratio
• Transfer-clutch calibration
• Valve-body configuration
• Solenoid arrangement
• Electrical connectors
• Speed-sensor design
• Transmission control strategy
• Torque-converter specifications
• Internal gear ratios
• Mounting brackets
• Engine application
• Model-year calibration

Therefore, match the complete transmission code whenever possible. The code TZ1B5LBZAA must not be confused with similar units such as TZ1B5LBXAA, TZ1B5LBYAA, or other TZ-series transmissions without confirming all relevant specifications. Ratio references list several similar EJ205-compatible transmissions with a 4.44 ratio, but identical ratios alone do not establish complete interchangeability.

Why Buy From J-Spec Auto Sports?

J-Spec Auto Sports specializes in high-quality JDM engines, transmissions, front clips, and drivetrain components. Our team has extensive experience identifying Subaru transmission codes and assisting customers with JDM-to-USDM fitment.

Customers choose J-Spec Auto Sports for:

• Genuine OEM Japanese components
• Clean, low-mileage inventory
• Professional inspection
• Detailed actual-item photographs
• Experienced Subaru fitment assistance
• Honest compatibility guidance
• Secure freight packaging
• Fast nationwide shipping
• Responsive customer service
• 90-day limited warranty

Unlike sellers who identify a transmission only as a generic Subaru 4EAT, we emphasize the complete transmission code, drivetrain ratio, and proper compatibility verification.

Shipping Information

This transmission is securely prepared and palletized for freight shipment. Careful packaging helps protect the bellhousing, oil pan, electrical connectors, axle openings, and torque converter during transportation.

Nationwide shipping is available to:

• Automotive repair shops
• Commercial addresses
• Dealerships
• Freight terminals
• Businesses with a forklift or loading dock
• Residential addresses when liftgate service is arranged

Shipping charges vary according to the destination, address type, and services required.

Warranty

This professionally inspected JDM transmission includes a 90-day limited warranty.

Warranty coverage requires proper professional installation. Additionally, the installer must confirm the correct transmission application, use the required fluid, clean the transmission cooler system, and ensure the rear differential ratio matches the replacement transmission.

Damage resulting from incorrect installation, contaminated cooler lines, improper fluid, overheating, electrical problems, an incompatible rear differential, or mismatched transmission specifications may not be covered.

Compatibility Disclaimer

This listing is for a JDM Subaru TZ1B5LBZAA 4EAT AWD automatic transmission commonly associated with select EJ205-powered Subaru applications.

Year, make, model, and engine information should be treated as a fitment guide rather than a guarantee. Subaru used multiple transmission codes and configurations within the same model year.

Before purchasing, compare the following with your original transmission:

• Complete identification code
• Engine application
• Final-drive ratio
• Rear differential ratio
• Electrical connectors
• Sensors
• Mounting points
• Torque converter
• Overall housing configuration

Contact J-Spec Auto Sports with your VIN, original transmission code, and clear photographs of the transmission tag. Our team will help determine whether this unit is suitable for your Subaru.