JDM 2005–2008 Acura RL MJBA 3.5L SH-AWD 5-Speed Automatic Transmission – J35A8

Replace your slipping, harsh-shifting, noisy, damaged, or failed transmission with a low-mileage JDM Acura RL MJBA automatic transmission from J-Spec Auto Sports.

This genuine Japanese-market transmission targets compatible 2005–2008 Acura RL models equipped with the 3.5L J35A8 V6 engine and Super Handling All-Wheel Drive / SH-AWD.

The individual transmission offered on this page carries serial number MJBA 1027899, while the live J-Spec listing identifies Item ID 190, model years 2005–2008, automatic AWD configuration, and a 30-day limited warranty.

Because the U.S.-market 2005–2008 RL commonly uses the MRJA transmission designation, buyers should treat this MJBA as a JDM replacement configuration that requires careful comparison rather than assuming that the code matches the original U.S. transmission.

Therefore, always compare the complete transmission, torque converter, transfer assembly, electronics, sensors, mounts, and external hardware before installation.

Quick Details

• Vehicle: Acura RL
• Model Years: 2005–2008
• JDM Transmission Code: MJBA
• Serial Number: MJBA 1027899
• USDM Reference Code: MRJA – verify original transmission
• Transmission Type: 5-Speed Automatic
• Engine: J35A8 3.5L V6
• Drivetrain: SH-AWD
• Condition: Used JDM / Low Mileage
• Origin: Japan
• Item ID: 190
• SKU: MT33
• Photos: Actual Product Photos
• Warranty: 30 Days
• Shipping: Nationwide Freight Shipping
• Installation: Affordable Installation Available
• Local Pickup: Henrico / Richmond, Virginia

Acura RL 5-Speed Automatic Transmission

The 2005–2008 Acura RL uses a conventional electronically controlled 5-speed automatic transmission.

Unlike a CVT, this gearbox uses five fixed forward ratios and a torque converter.

For SEO and technical clarity, keep these identifiers together:

Acura RL → 2005–2008 → J35A8 3.5L → 5-Speed Automatic → SH-AWD

That relationship is considerably more useful than a generic “Acura 3.5L AWD transmission” description.

Important: MJBA vs. MRJA

This is the most important fitment section on the page.

The transmission offered by J-Spec carries the MJBA code.

However, U.S.-market 2005–2008 Acura RL applications are commonly referenced with the MRJA transmission designation.

Therefore:

JDM Unit → MJBA

USDM Original → commonly MRJA

should be treated as a fitment comparison rather than automatically as identical codes.

Before installation, verify:

• Transmission case
• Bellhousing
• Torque converter
• Electrical connectors
• Solenoids
• Speed sensors
• Range switch
• Transfer assembly connection
• Mounting points
• Cooler fittings
• Axle connections
• Control compatibility

A JDM transmission can sometimes require the transfer of compatible USDM external components.

Important: Do Not Mix 2009–2010 RL Applications

The 2009–2010 RL changed to the 3.7L J37A1 engine and uses a different transmission configuration.

Therefore, keep this page tightly focused on:

2005–2008 RL → 3.5L J35A8

and do not broaden the product to 2009–2010 simply because later RL transmissions may look similar.

Your own site contains separate later RL inventory, including MJBA-labeled 3.7L units, which makes clear code and year differentiation especially important.

J35A8 3.5L V6 Application

This transmission targets compatible 3.5L RL applications.

The J35A8 is Honda/Acura’s 3.5L V6 used in this generation of RL.

However, engine size alone does not guarantee transmission interchangeability.

Different Honda/Acura 3.5L vehicles use different:

• Transmission codes
• Final-drive configurations
• AWD systems
• Torque converters
• Case designs
• Electronics
• Control strategies

Therefore, never buy an automatic transmission solely because it bolts to a J35-series engine.

SH-AWD Drivetrain

The RL uses Acura’s Super Handling All-Wheel Drive / SH-AWD system.

This means the transmission works as part of a larger AWD drivetrain involving the transfer assembly, propeller shaft, and rear differential system.

Therefore, fitment verification should include the complete AWD interface.

Check:

• Transfer assembly mounting
• Output splines
• Driveshaft connection
• Transfer case seals
• Rear driveline compatibility
• Transmission electronics
• AWD-related control systems

Do not treat this as a normal front-wheel-drive Honda transmission.

Vehicle Compatibility

This JDM MJBA targets compatible:

2005 Acura RL 3.5L SH-AWD

• J35A8 V6
• 5-speed automatic
• SH-AWD
• Compare original MRJA transmission

2006 Acura RL 3.5L SH-AWD

• J35A8 V6
• AWD
• Automatic
• Verify original code and external configuration

2007 Acura RL 3.5L SH-AWD

• J35A8 V6
• 5-speed automatic
• SH-AWD
• Verify complete interchange

2008 Acura RL 3.5L SH-AWD

• J35A8 V6
• AWD
• Automatic
• Compare original transmission before installation

Always verify the VIN, production information, and original transmission code before ordering.

JDM-to-USDM Fitment

Because this transmission comes from a Japanese-market application, external differences may exist.

Before installation, place the JDM MJBA and original USDM transmission side by side.

Compare:

• Transmission code
• Transmission case
• Bellhousing
• Torque converter
• Shift solenoids
• Pressure-control solenoids
• Speed sensors
• Range switch
• Electrical connectors
• Wiring
• Mounts
• Brackets
• Cooler fittings
• Transfer assembly connection
• Axle connections

When necessary, transfer compatible original USDM components.

Most importantly, do not cut wiring, force connectors, or modify the transmission before confirming fitment.

What Is Included?

The sale includes the actual MJBA transmission shown in the current J-Spec Auto Sports product photographs.

Depending on what remains attached, components may include:

• MJBA automatic transmission assembly
• Transmission housing
• Internal transmission components
• Valve-body components
• Factory solenoids that remain attached
• Sensors that remain attached
• Electrical connectors
• Torque converter when pictured or specifically stated
• Brackets when pictured

Do not automatically assume the sale includes:

• Transfer case / transfer assembly
• Rear differential
• Driveshaft
• Axles
• TCM
• ECU
• Wiring harness
• Mounts

unless the actual photos or product details specifically say they are included.

Actual Product Photos

The current Item 190 page instructs customers to review all actual pictures to determine fitment and condition.

Keep that language prominent.

Actual product photos help customers compare:

• Transmission case
• Torque converter
• Sensors
• Solenoids
• Electrical connectors
• Transfer interface
• Mounting points
• Cooler fittings

before ordering.

RECOMMENDED INSTALLATION PROCEDURE

Diagnose the Original Transmission Failure

Before installing the replacement transmission, determine why the original unit failed.

Possible causes include:

• Internal clutch wear
• Torque-converter problems
• Valve-body faults
• Solenoid problems
• Pressure-control faults
• Overheating
• Low ATF level
• Contaminated fluid
• Cooler restrictions
• Sensor problems
• Wiring problems
• AWD drivetrain faults

Correcting the original cause helps protect the replacement transmission.

Flush the Transmission Cooler and Lines

Thoroughly clean the cooler and transmission lines before installation.

A failed automatic transmission can circulate:

• Metal particles
• Clutch material
• Friction debris
• Contaminated ATF

Consequently, debris left in the cooling circuit can enter the replacement transmission after startup.

Clean the entire cooler system.

If a cooler cannot be properly cleaned, replace it.

Do not skip this step.

Use Acura ATF DW-1

Acura now specifies ATF DW-1 for this application. Earlier vehicles originally referenced ATF-Z1, but Acura/Honda superseded Z1 with DW-1.

Use:

Acura / Honda ATF DW-1

Do not use a generic fluid solely because its container claims broad compatibility.

Correct ATF helps provide:

• Proper shift quality
• Hydraulic pressure
• Clutch operation
• Torque-converter operation
• Lubrication
• Temperature control

Never Reuse Old ATF

Do not reuse fluid from the failed transmission.

Old ATF may contain:

• Metal particles
• Clutch debris
• Oxidized fluid
• Dirt
• Other contamination

Instead, start the replacement transmission with fresh DW-1.

Check ATF Level Correctly

Acura’s service procedure requires checking fluid with the transmission warmed to operating temperature, on level ground, and within approximately 60–90 seconds after shutting the engine off.

Therefore, follow the factory procedure rather than guessing the fluid level.

Both underfilling and overfilling can create transmission problems.

Inspect the Torque Converter

Before installation, verify that the torque converter matches the intended application.

Make sure the converter seats fully inside the transmission.

Improper seating can damage the transmission pump during installation.

Never use bellhousing bolts to force the transmission against the engine.

Inspect the Transfer Assembly

Because the RL uses SH-AWD, inspect the transfer assembly carefully.

Check:

• Input and output splines
• Bearings
• Seals
• Housing condition
• Fluid leaks
• Mounting surfaces

If the original transfer assembly needs to be reused, verify that it correctly mates with the JDM transmission before final installation.

Inspect Accessible Seals

Check:

• Axle seals
• Torque-converter seal
• Transfer-side seals
• Cooler fittings
• Case sealing areas

Replace questionable seals while the transmission remains outside the vehicle.

Inspect Engine and Transmission Mounts

Check mounts for:

• Cracks
• Separation
• Excessive movement
• Loose hardware

Worn mounts can create clunking, vibration, and harsh engagement that may incorrectly appear to be transmission problems.

Inspect Axles and Driveshaft

Because this is an AWD drivetrain, inspect:

• Front CV axles
• Splines
• Boots
• Propeller shaft
• Joints
• Flanges
• Support components

A driveline problem can create vibration or noise that may be blamed on the transmission.

Scan the Vehicle Before Removal

Record all diagnostic trouble codes before removing the original transmission.

Pay attention to:

• Shift-solenoid codes
• Pressure-control codes
• Torque-converter codes
• Speed-sensor codes
• AWD / SH-AWD faults
• Engine codes
• Communication faults

Do not simply clear stored codes.

Diagnose problems that could affect the replacement transmission.

PCM / Transmission Relearn

After installation, complete applicable Acura transmission initialization and relearn procedures.

Use Honda/Acura-compatible diagnostic equipment when required.

Mechanical installation alone may not complete the repair.

INITIAL STARTUP CHECKLIST

Before road testing:

• Confirm MJBA transmission identification.
• Compare with original MRJA configuration.
• Verify J35A8 3.5L application.
• Confirm SH-AWD compatibility.
• Use fresh ATF DW-1.
• Check ATF level correctly.
• Verify electrical connectors.
• Check cooler-line connections.
• Inspect transfer assembly.
• Check axle seals.
• Confirm Park operation.
• Confirm Reverse engagement.
• Confirm Drive engagement.
• Scan for diagnostic codes.
• Check for warning lights.
• Inspect for ATF leaks.
• Inspect transfer-area leaks.

If anything appears abnormal, diagnose it before driving.

Initial Road Test

Begin with a gentle road test.

Monitor:

• Reverse engagement
• Drive engagement
• 1–2 shift
• 2–3 shift
• 3–4 shift
• 4–5 shift
• Torque-converter lockup
• Shift flare
• Slipping
• Shudder
• SH-AWD operation
• Drivetrain vibration
• Warning lights
• Fluid leaks

Avoid aggressive acceleration until normal operation has been confirmed.

Afterward, inspect the transmission again and recheck the ATF level according to the correct procedure.

Common Signs of Acura RL Transmission Problems

A failing RL automatic transmission may produce:

• Harsh shifting
• Delayed engagement
• Slipping
• Shift flare
• Torque-converter shudder
• Abnormal noise
• Overheating
• Warning lights
• Transmission-related diagnostic codes
• Fluid leaks

However, these symptoms do not always mean the complete transmission has failed.

For example, torque-converter problems, solenoids, sensors, wiring, fluid condition, mounts, or SH-AWD drivetrain issues can create similar symptoms.

Therefore, diagnose the complete vehicle before replacing the transmission.

Why Choose a Low-Mileage JDM MJBA Transmission?

A Japanese-import transmission can provide an OEM-based replacement option for a high-mileage or damaged original RL transmission.

Benefits include:

• Genuine Honda/Acura OEM construction
• Low-mileage Japanese donor unit
• MJBA transmission identification
• Individual serial number
• 3.5L J35A8 application
• 5-speed automatic
• SH-AWD drivetrain configuration
• Actual product photos
• Individual Item ID
• 30-day limited warranty
• Nationwide freight shipping
• Installation available

Most importantly, the physical MJBA identification gives buyers a specific transmission to compare against the original USDM RL drivetrain.

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.

Our team supplies JDM engines, automatic transmissions, manual transmissions, CVTs, and AWD drivetrain components to repair facilities, enthusiasts, and vehicle owners throughout the United States.

Rather than operating as a general salvage yard, J-Spec Auto Sports focuses specifically on Japanese engines and transmissions.

Individual Transmission Identification

This inventory unit carries:

Transmission Code: MJBA
Serial Number: MJBA 1027899
Item ID: 190
SKU: MT33

The live page confirms these details.

I recommend changing the current Product Code:

Acura 3.5L AWD Trans

to:

MJBA 5AT SH-AWD

That gives customers and search engines a much stronger technical identifier.

Nationwide Shipping

J-Spec Auto Sports ships transmissions throughout the continental United States.

Freight pricing depends on:

• Destination ZIP code
• Residential or commercial delivery
• Liftgate requirements
• Freight-terminal availability
• Delivery location

Inspect the shipment and pallet before signing for delivery.

Document any visible freight damage immediately.

Local Virginia Pickup

Local pickup is available from J-Spec Auto Sports in Henrico, Virginia.

Customers throughout Richmond, Central Virginia, Northern Virginia, Maryland, Washington D.C., and surrounding areas can also arrange pickup or ask about installation.

30-Day Limited Warranty

This specific Item ID 190 carries a 30-day limited warranty.

Keep receipts for:

• Acura ATF DW-1
• Cooler flushing
• Replacement seals
• Professional installation
• Diagnostic procedures
• Related AWD drivetrain service

Review J-Spec Auto Sports’ full warranty policy before installation.

FREQUENTLY ASKED QUESTIONS

What transmission does the 2005–2008 Acura RL use?

The U.S.-market 2005–2008 RL commonly uses the MRJA 5-speed automatic SH-AWD transmission, while this JDM unit carries the MJBA code. Verify the complete interchange before installation.

What is an MJBA transmission?

MJBA is the identification code on this Japanese-market Acura/Honda AWD automatic transmission. This individual unit carries serial number MJBA 1027899.

Is the MJBA a 5-speed automatic?

Yes. This transmission uses a 5-speed automatic configuration.

What engine works with this transmission?

This listing targets compatible J35A8 3.5L V6 Acura RL applications.

Is this transmission AWD?

Yes. It targets the Acura RL SH-AWD drivetrain.

Is MJBA the same as MRJA?

Do not treat the codes as automatically identical. The JDM unit is MJBA, while U.S.-market early RL applications commonly use MRJA. Compare all major components before installation.

Will this fit a 2005 Acura RL?

It may work as a JDM replacement for compatible 2005 RL 3.5L SH-AWD applications after comparing the original MRJA transmission and external components.

Will it fit a 2006 Acura RL?

This JDM MJBA targets compatible 2006 RL 3.5L AWD applications, subject to complete fitment verification.

Will it fit a 2007 Acura RL?

It targets compatible 2007 RL 3.5L SH-AWD applications when the transmission and external components match.

Will it fit a 2008 Acura RL?

It targets compatible 2008 RL 3.5L applications after verifying the original transmission code, transfer assembly, and electronics.

Will this fit a 2009 Acura RL?

Do not advertise this Item 190 as a direct 2009 replacement. The 2009 RL moved to a different 3.7L drivetrain configuration.

Does this fit an Acura MDX?

Do not assume so. Similar Honda/Acura AWD transmissions can use different case designs, final drives, electronics, and transfer configurations.

What transmission fluid should I use?

Use Acura ATF DW-1. Acura/Honda superseded the older ATF-Z1 specification with DW-1.

Can I use generic ATF?

Use the correct Acura/Honda fluid specification rather than choosing a generic fluid solely based on broad compatibility claims.

Should I flush the transmission cooler?

Yes. Thoroughly clean the cooler and transmission lines before installing the replacement unit.

Can I reuse the old transmission fluid?

No. Start the replacement transmission with fresh ATF DW-1.

Does the torque converter need to match?

Yes. Compare the JDM torque converter with the original USDM unit before installation.

Does the transfer case come with the transmission?

Only consider the transfer assembly included if it appears in the actual product photos or the listing specifically says it is included.

Does the transmission need a relearn?

Depending on the repair, Acura initialization or relearn procedures may be necessary. Follow the applicable service procedure.

Is this transmission rebuilt?

No, unless specifically stated otherwise. This is a used JDM/OEM transmission.

Does it have a warranty?

Yes. Item ID 190 currently carries a 30-day limited warranty.

Do you ship nationwide?

Yes. J-Spec Auto Sports ships transmissions throughout the continental United States.

How do I verify fitment?

Provide:

• Vehicle year
• VIN
• Engine code
• Original transmission code

For the best verification, compare the case, converter, sensors, solenoids, mounts, transfer interface, axle openings, cooler fittings, and wiring.

Order Your JDM Acura RL MJBA Transmission

If your 2005–2008 Acura RL needs a replacement automatic transmission, this low-mileage JDM MJBA 5-speed SH-AWD transmission provides an OEM-based replacement option for properly verified J35A8 3.5L applications.

This Item ID 190 carries serial number MJBA 1027899, uses actual product photos, and comes with a 30-day limited warranty.

Because the original U.S.-market RL commonly uses an MRJA transmission, verify the MJBA-to-MRJA interchange and all external components before installation.