Honda Stepwagon RG1 MTJA Transmission for Sale

Looking for a Honda Stepwgn MTJA transmission? J-Spec Auto Sports offers this low-mileage JDM MTJA 4-speed automatic FWD transmission for compatible 2005–2008 Honda Stepwgn / Stepwagon RG1 models equipped with the K20A 2.0L engine.

This individual transmission is identified as:

Transmission Code: MTJA
Serial Number: MTJA-2003520
Item ID: 46231
SKU: MT264
Engine: K20A 2.0L
Transmission Type: 4-Speed Automatic
Drivetrain: FWD / 2WD

Therefore, customers searching for an RG1 Stepwgn replacement transmission should compare the MTJA identification and physical configuration with their original unit before ordering.

2005–2008 Honda Stepwgn RG1 K20A Transmission

The third-generation Japanese-market Honda Stepwgn used the K20A 2.0L engine in RG1 and RG2 chassis configurations.

However, there is an important drivetrain difference:

RG1 → K20A 2.0L → 2WD / FWD → 4-Speed Automatic

RG2 → K20A 2.0L → 4WD → 4-Speed Automatic

For Item 46231, the strongest application relationship is:

2005–2008 Honda Stepwgn RG1 → K20A 2.0L → MTJA → 4-Speed Automatic → FWD

Therefore, RG1 should be the primary application used throughout this product page.

MTJA 4-Speed Automatic Transmission

The MTJA transmission code is the most important identification point for this unit.

MTJA is associated with Japanese-market Honda K20A automatic applications, including the Honda Stepwgn RG1.

In addition, this is a conventional 4-speed automatic transmission, not a CVT.

However, Honda used different K-series transmission configurations across models and drivetrains. As a result, the K20A engine code alone does not guarantee interchangeability.

Before purchasing, compare the transmission code, case, bellhousing, electrical connectors, sensors, solenoids, torque converter, mounts, axle interfaces and cooler connections.

Honda Stepwagon RG1 vs RG2 Transmission

Customers frequently search for both Honda Stepwagon RG1 transmission and Honda Stepwagon RG2 transmission. Nevertheless, these chassis should not automatically be treated as the same transmission application.

The RG1 is a 2WD/FWD chassis, while the RG2 uses a 4WD drivetrain.

Therefore, this MTJA Item 46231 should primarily be marketed for RG1 FWD/2WD applications unless physical inspection confirms compatibility with another drivetrain configuration.

Most importantly, do not promise direct RG2 4WD interchange based only on the K20A engine.

JDM Honda Civic K20A Applications

This MTJA transmission may also be relevant to customers building or repairing certain JDM Honda Civic K20A setups.

However, JDM Civic models used several different K20A powertrain and transmission combinations. Therefore, “K20A Civic” should be treated as a secondary search and swap-related application rather than guaranteed direct fitment.

For a JDM Civic or K-series swap, verify the transmission case, mounts, axles, wiring, electrical connectors, ECU/TCM requirements, shifter configuration and torque converter before purchasing.

Consequently, the strongest SEO strategy is to target Honda Stepwgn RG1 MTJA transmission as the primary application while retaining JDM Civic and K20A terminology for relevant secondary searches.

Honda K20A MTJA Transmission Fitment

Before ordering this MTJA transmission, verify the complete drivetrain configuration.

In particular, compare:

• MTJA transmission identification
• K20A engine application
• FWD / 2WD drivetrain
• Bellhousing
• Transmission case
• Electrical connectors
• Sensors
• Solenoids
• Torque converter
• Mounting points
• Axle interfaces
• Cooler fittings
• External components

Furthermore, compare the actual Item 46231 photographs with your original transmission.

MTJA Transmission Installation

Proper installation is essential when replacing a Honda automatic transmission.

First, thoroughly flush the transmission cooler and cooler lines. A failed transmission can leave clutch material, metal particles and contaminated ATF inside the cooling circuit.

Therefore, make sure the cooler and lines are completely clean before operating the replacement transmission.

Next, inspect accessible seals. In particular, inspect the torque-converter/front seal and axle seals before installation.

Additionally, confirm whether the torque converter is included with Item 46231.

If included, make sure the torque converter is fully seated before mating the transmission to the engine. Most importantly, never use the bellhousing bolts to force the engine and transmission together.

Honda MTJA Transmission Fluid and Setup

Use Honda/Acura Genuine ATF DW-1 unless current vehicle-specific Honda service information specifies otherwise.

Additionally, use fresh transmission fluid rather than reusing contaminated ATF from the failed transmission.

After installation, verify the proper ATF level according to the applicable Honda service procedure.

Then, scan the vehicle for transmission-related diagnostic trouble codes. Furthermore, perform applicable reset or learning procedures when required.

Final Inspection and Road Test

After installation, complete a controlled road test.

First, verify Reverse and Drive engagement. Then, confirm normal operation through all four forward gears.

Additionally, verify downshifts and torque-converter operation.

Afterward, inspect the transmission for fluid leaks, delayed engagement, slipping, abnormal shifting, warning lights or unusual noises.

Finally, keep the original transmission until Item 46231 has been successfully installed and road-tested.

Why Buy From J-Spec Auto Sports?

J-Spec Auto Sports specializes in JDM engines and transmissions. Moreover, the photographs shown on this listing represent the actual Item 46231 transmission offered for sale.

As a result, customers can compare the case, connectors and external components with their original MTJA transmission before ordering.

This transmission includes a 90-day limited warranty, subject to J-Spec Auto Sports’ current warranty terms.

In addition, nationwide freight shipping and affordable installation are available.

PRODUCT SPECIFICATIONS

Brand: Honda
Primary Model: Stepwgn / Stepwagon
Primary Chassis: RG1
Primary Years: 2005–2008
Engine Code: K20A
Engine Size: 2.0L
Transmission Code: MTJA
Serial Number: MTJA-2003520
Transmission Type: 4-Speed Automatic
Drivetrain: FWD / 2WD
Transmission Fluid: Honda/Acura Genuine ATF DW-1
Item ID: 46231
SKU: MT264
Condition: Used OEM JDM / Low Mileage
Warranty: 90-Day Limited Warranty

FITMENT & COMPATIBILITY

PRIMARY APPLICATION:

2005–2008 Honda Stepwgn / Stepwagon RG1 K20A 2.0L FWD / 2WD 4-Speed Automatic

TRANSMISSION:

MTJA

SERIAL:

MTJA-2003520

RG2 APPLICATION:

2005–2008 Honda Stepwgn / Stepwagon RG2 K20A 2.0L 4WD

IMPORTANT:

RG2 is a 4WD chassis. Do not advertise Item 46231 as direct RG2 fitment unless its drivetrain configuration and interchange have been specifically verified.

JDM CIVIC / K20A APPLICATION:

Select JDM Honda Civic or K20A swap configurations may use compatible K-series automatic-transmission architecture.

However, exact MTJA interchange must be verified before ordering.

BEFORE ORDERING, VERIFY:

• Vehicle chassis code
• RG1 vs RG2
• FWD / 2WD vs 4WD
• Engine code
• Original transmission code
• MTJA identification
• Bellhousing
• Transmission case
• Electrical connectors
• Sensors
• Solenoids
• Torque converter
• Mounts
• Axle interfaces
• Cooler fittings
• Wiring and control configuration

DO NOT AUTOMATICALLY ASSUME:

• RG1 transmission = RG2 transmission
• FWD MTJA = 4WD transmission
• Every K20A transmission is interchangeable
• Every JDM Civic K20A setup accepts MTJA
• K-series bellhousing compatibility guarantees complete interchange

INSTALLATION CHECKLIST

• Verify MTJA transmission code
• Verify RG1 FWD/2WD application
• Compare original transmission
• Compare electrical connectors
• Compare bellhousing
• Compare mounts
• Compare axle interfaces
• Flush transmission cooler
• Flush cooler lines
• Inspect accessible seals
• Inspect torque-converter/front seal
• Inspect axle seals
• Verify torque converter inclusion
• Verify torque converter compatibility
• Fully seat torque converter before installation
• Never force transmission to engine with bellhousing bolts
• Use Honda/Acura Genuine ATF DW-1
• Verify proper ATF level
• Scan for transmission DTCs
• Perform applicable reset/relearn
• Verify all four forward gears
• Check for fluid leaks
• Complete controlled road test
• Keep original transmission until successful road test

FAQ

What transmission does a 2005–2008 Honda Stepwgn RG1 use?

Compatible Japanese-market Honda Stepwgn RG1 models equipped with the K20A 2.0L engine use a 4-speed automatic transmission. MTJA is associated with the RG1 K20A FWD/2WD application.

What is an MTJA transmission?

MTJA is a Honda automatic transmission identification associated with Japanese-market K20A applications, including the Honda Stepwgn RG1.

Is the MTJA a 4-speed transmission?

Yes. This MTJA application is a conventional 4-speed automatic transmission.

What engine does this MTJA transmission work with?

This listing primarily targets the Honda K20A 2.0L engine used in compatible Japanese-market Stepwgn RG1 applications.

Does MTJA fit a 2005 Honda Stepwagon RG1?

It targets compatible 2005 Honda Stepwgn / Stepwagon RG1 K20A 2.0L FWD automatic applications. Verify the original transmission before ordering.

Does MTJA fit a 2006 Honda Stepwgn RG1?

It targets compatible 2006 RG1 K20A 2.0L FWD/2WD applications when the original transmission configuration matches.

Does MTJA fit a 2007 Honda Stepwagon RG1?

It targets compatible 2007 Honda Stepwgn RG1 K20A 2.0L automatic applications after transmission verification.

Does MTJA fit a 2008 Honda Stepwgn RG1?

It targets compatible 2008 RG1 K20A 2.0L automatic applications when the original transmission and replacement configuration match.

What is the difference between Honda Stepwgn RG1 and RG2?

RG1 is the 2WD/FWD K20A Stepwgn chassis, while RG2 is the 4WD K20A chassis. Therefore, transmission interchange should not be assumed between them.

Does this MTJA transmission fit an RG2 Stepwgn?

Do not automatically install this RG1/FWD MTJA transmission into an RG2 4WD application. Verify the exact drivetrain and transmission configuration first.

Can this MTJA transmission be used in a JDM Honda Civic?

It may be relevant to certain JDM Civic/K20A configurations or custom K-series setups. However, exact compatibility must be verified because Honda used multiple K20A transmission configurations.

Will MTJA bolt to a K20A engine?

MTJA is associated with K20A applications. Nevertheless, physical engine attachment alone does not establish complete vehicle compatibility. Mounts, axles, electronics, controls and other components must also match.

Is MTJA a CVT?

No. This application uses a conventional 4-speed automatic transmission.

What transmission fluid does MTJA use?

Use Honda/Acura Genuine ATF DW-1 unless current vehicle-specific Honda service information specifies otherwise.

Should the transmission cooler be flushed?

Yes. Thoroughly flush the transmission cooler and cooler lines before operating the replacement transmission.

Is the torque converter included?

Verify the components included with actual Item 46231 before promising torque-converter inclusion.

Does J-Spec ship Honda Stepwgn transmissions?

Yes. Nationwide freight shipping is available.

Does J-Spec offer installation?

Yes. Affordable installation is available.