JDM 2013–2016 Subaru BRZ / Scion FR-S / Toyota GT86 6-Speed Manual Transmission + 4.10 Rear Differential

Replace your grinding, noisy, worn, or failed drivetrain with a low-mileage JDM Subaru BRZ / Scion FR-S / Toyota GT86 6-speed manual transmission and matching 4.10 rear differential package from J-Spec Auto Sports.

This genuine OEM Japanese-market drivetrain package targets compatible 2013–2016 Subaru BRZ, Scion FR-S, and Toyota GT86 models equipped with the naturally aspirated 2.0L FA20 / 4U-GSE boxer engine and rear-wheel drive.

Unlike the transmission-only BRZ listing, this Item ID 411 specifically includes the 6-speed manual gearbox and matching 4.1 rear differential.

Subaru factory specifications confirm that the manual BRZ drivetrain uses a 4.100 final-drive ratio together with a Torsen limited-slip rear differential.

Because the transmission and rear differential come as a matched drivetrain package, this listing provides a strong replacement option for owners who need both components rather than sourcing them separately.

Quick Details

• Vehicle: Subaru BRZ / Scion FR-S / Toyota GT86
• Model Years: 2013–2016
• Product Code: ZN6 6MT
• Transmission Type: 6-Speed Manual
• Engine: 2.0L FA20 / 4U-GSE
• Engine Type: Naturally Aspirated Boxer 4-Cylinder
• Drivetrain: RWD
• Rear Differential: Included
• Final Drive: 4.10
• Differential Type: Factory Torsen Limited-Slip Differential configuration
• Condition: Used JDM / Low Mileage
• Origin: Japan
• Item ID: 411
• Photos: Actual Product Photos
• Warranty: 30 Days
• Shipping: Nationwide Freight Shipping
• Installation: Affordable Installation Available
• Local Pickup: Henrico / Richmond, Virginia

BRZ / FR-S / GT86 6-Speed Manual Transmission Specifications

The first-generation BRZ, FR-S, and GT86 share the same basic rear-wheel-drive sports-car architecture.

Subaru and Toyota paired the naturally aspirated 2.0L FA20 / 4U-GSE boxer engine with a close-ratio 6-speed manual gearbox.

Factory 6-Speed Manual Ratios

1st Gear: 3.626
2nd Gear: 2.188
3rd Gear: 1.541
4th Gear: 1.213
5th Gear: 1.000
6th Gear: 0.767
Reverse: 3.437
Final Drive: 4.100

Subaru lists these ratios for both the 2013 and 2016 BRZ manual drivetrain.

The close gear spacing helps keep the FA20 within its useful RPM range during spirited driving. Meanwhile, sixth gear provides a taller cruising ratio for highway operation.

Matching 4.10 Rear Differential Included

This product is more valuable than a transmission-only listing because the matching rear differential is included.

The current live page specifically states that the drivetrain package includes:

• 6-speed manual transmission
• 4.1 rear differential
• Transmission housing and internal components

Subaru identifies the factory BRZ drivetrain as rear-wheel drive with a Torsen limited-slip differential and 4.100 final drive.

Therefore, I recommend using:

4.10 Torsen LSD Rear Differential

in the product copy when the physical differential matches the factory unit shown with this package.

Why the 4.10 Final Drive Matters

The 4.10 rear differential plays an important role in the factory gearing of the 2013–2016 manual BRZ platform.

A numerically higher final-drive ratio provides more mechanical leverage than a taller ratio.

As a result, the drivetrain delivers responsive acceleration while retaining the gear spacing Toyota and Subaru designed around the FA20 engine.

However, the final drive does not add horsepower.

Instead, it changes the relationship between engine speed and wheel speed.

For that reason, describe the 4.10 as a factory gearing specification, not a horsepower upgrade.

Torsen Limited-Slip Differential

Subaru’s factory specification identifies the BRZ rear differential as a Torsen limited-slip differential.

A Torsen-style differential can distribute torque between the rear wheels according to available traction without relying on a conventional open-differential arrangement.

Benefits can include:

• Improved rear-wheel traction
• More predictable power delivery during cornering
• Better use of available grip
• Factory-matched sports-car drivetrain behavior

Because this listing includes the rear differential, adding Torsen LSD to the product copy can help differentiate it from a transmission-only listing.

Vehicle Compatibility

This drivetrain package targets compatible:

2013 Subaru BRZ

• FA20 2.0L
• RWD
• 6-speed manual
• 4.10 rear differential

2014 Subaru BRZ

• FA20 2.0L
• RWD
• 6-speed manual
• Matching 4.10 drivetrain

2015 Subaru BRZ

• FA20 2.0L
• RWD
• 6-speed manual
• Matching 4.10 drivetrain

2016 Subaru BRZ

• FA20 2.0L
• RWD
• 6-speed manual
• Matching 4.10 drivetrain

2013–2016 Scion FR-S

Compatible FR-S manual applications share the same basic 2.0L boxer, RWD, and six-speed drivetrain architecture.

2013–2016 Toyota GT86

Compatible GT86 models use Toyota’s 4U-GSE designation for the same basic boxer-engine family.

Always compare the actual transmission and differential with the original drivetrain before ordering.

Important: 2013–2016 vs. 2017+

Keeping this page focused on 2013–2016 is important.

For 2017, Subaru increased the manual BRZ final drive to 4.30, while the earlier 2013–2016 manual drivetrain uses 4.10. Subaru’s later factory specifications clearly show that change.

Therefore:

2013–2016 Manual BRZ → 4.10 Final Drive

2017+ Manual BRZ → 4.30 Final Drive

This makes your current 2013–2016 + 4.10 product identity technically valuable.

Do not casually broaden this package to 2017+.

Important: Manual vs. Automatic Final Drive

Another useful clarification is that the automatic and manual versions should not be grouped together simply because both are BRZ transmissions.

For 2013–2016, Subaru lists a 4.10 final drive for both manual and automatic, but the actual transmissions and ratios are completely different.

Therefore, this listing should always prominently state:

6-Speed Manual

to prevent automatic-transmission customers from ordering the wrong product.

FA20 / 4U-GSE Engine Application

Subaru identifies the engine as FA20, while Toyota commonly uses 4U-GSE.

For SEO, I recommend using both names naturally:

FA20 / 4U-GSE 2.0L Boxer Engine

This allows the page to capture searches from:

• Subaru BRZ owners
• Scion FR-S owners
• Toyota GT86 owners
• JDM Toyota 86 customers

while still describing the same underlying drivetrain family.

ZN6 Product Identification

The live product currently uses:

Product Code: ZN6 6MT.

ZN6 refers to the Toyota 86 / GT86 chassis family and works well as a broad inventory identifier.

However, if you can read the actual transmission identification number or Toyota/Subaru part number on the gearbox, I would add it to the Details section.

More specific first-party identification strengthens:

• Fitment confidence
• Long-tail Google searches
• AI/LLM product understanding
• Customer trust

JDM-to-USDM Fitment

This package came from a Japanese-market drivetrain application.

Although the basic transmission and differential can serve compatible U.S.-market applications, external differences can exist.

Before installation, compare the JDM and original USDM components side by side.

Check the transmission for:

• Bellhousing
• Transmission case
• Shifter configuration
• Reverse-light switch
• Neutral switch
• Electrical connectors
• Transmission mount
• Driveshaft connection
• Clutch-release components
• Starter mounting

Also compare the rear differential for:

• Differential housing
• Input flange
• Axle connections
• Mounting points
• Breather arrangement
• Final-drive ratio

Do not modify either component until compatibility has been confirmed.

What Is Included?

This listing includes:

• 6-Speed Manual Transmission Assembly
• Matching 4.10 Rear Differential
• Transmission housing and internal components
• Attached sensors or switches when pictured
• Attached brackets when pictured

The current live product explicitly states that the 6-speed gearbox and 4.1 rear differential are included.

Unless specifically shown or stated, do not assume the sale includes:

• Clutch
• Flywheel
• Driveshaft
• Axles
• Starter
• Slave cylinder
• Shifter assembly
• Transmission mount
• Differential hardware

Review all actual product photos before purchase.

RECOMMENDED MAINTENANCE BEFORE INSTALLATION

Replace the Transmission Fluid

Drain the existing transmission lubricant before installation.

Inspect the fluid for:

• Metal particles
• Bearing debris
• Synchronizer material
• Water contamination
• Excessive discoloration

Then refill the gearbox with the correct manufacturer-specified manual transmission lubricant.

Fresh fluid provides a known maintenance baseline.

Replace the Rear Differential Fluid

Because the rear differential is included, service it before operating the vehicle.

Drain the old gear oil and inspect it for:

• Metallic debris
• Bearing material
• Excessive discoloration
• Water contamination
• Abnormal odor

Next, refill the differential with the correct manufacturer-specified gear lubricant.

Inspect the Clutch

With the transmission removed, inspect:

• Clutch disc
• Pressure plate
• Flywheel
• Release bearing
• Clutch fork
• Slave cylinder

If the clutch has substantial wear, replace it before installing the gearbox.

Doing so can save another transmission removal later.

Inspect the Flywheel

Look for:

• Heat spots
• Cracks
• Grooves
• Warping
• Ring-gear damage

Resurface or replace the flywheel according to the clutch manufacturer’s requirements.

Inspect the Release Bearing

A worn release bearing can create noise whenever the clutch pedal is depressed.

Therefore, replace a questionable bearing while access remains easy.

Inspect Transmission Seals

Check:

• Input area
• Output seal
• Shifter seals
• Case sealing surfaces

Replace worn or leaking seals before installation.

Inspect Rear Differential Seals

Check the included differential for:

• Pinion-seal leakage
• Axle-seal leakage
• Housing leaks
• Damaged breather
• Excessive flange play

Fix any problem before installation.

Inspect the Rear Main Seal

Transmission removal exposes the rear of the FA20 engine.

Therefore, inspect the rear main seal for engine-oil leakage.

If leakage is present, repair it before installing the replacement transmission.

Inspect Drivetrain Mounts

Check the transmission and differential mounts for:

• Cracking
• Separation
• Excessive movement
• Damaged hardware

Worn mounts can create vibration, clunking, and poor drivetrain feel.

Inspect the Driveshaft

Check:

• Flanges
• Joints
• Splines
• Center support where applicable
• Fasteners

A damaged driveshaft can create vibration that may incorrectly appear to come from the gearbox or differential.

INSTALLATION CHECKLIST

Before installation:

• Confirm 2013–2016 application.
• Verify 6-speed manual configuration.
• Confirm the included 4.10 rear differential.
• Compare the JDM gearbox with the original.
• Compare the rear differential with the original.
• Verify shifter configuration.
• Check clutch components.
• Inspect flywheel.
• Replace worn release bearing.
• Inspect transmission seals.
• Inspect differential seals.
• Check transmission mount.
• Inspect differential mounts.
• Verify driveshaft fitment.
• Verify axle compatibility.
• Replace transmission fluid.
• Replace differential oil.
• Torque all fasteners correctly.

INITIAL STARTUP AND ROAD TEST

Before driving, operate the clutch and shift through all gears while the vehicle remains stationary.

Confirm:

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

Next, begin with a gentle road test.

Monitor:

• Clutch engagement
• Shift quality
• Synchronizer operation
• Transmission whine
• Differential noise
• Driveshaft vibration
• Gear pop-out
• Fluid leaks

Avoid aggressive driving until the complete drivetrain operates normally.

Afterward, inspect both the transmission and differential for leaks.

Common Signs of BRZ / FR-S Manual Drivetrain Problems

A worn manual drivetrain may produce:

• Gear grinding
• Difficult shifts
• Synchronizer problems
• Gear pop-out
• Bearing noise
• Transmission whine
• Rear differential whine
• Clunking
• Fluid leaks
• Driveline vibration

However, not every drivetrain complaint requires replacing the transmission and differential.

For example, worn clutch components, shifter bushings, mounts, axles, driveshaft components, or incorrect lubricant can create similar symptoms.

Therefore, diagnose the complete drivetrain before replacing components.

Why Choose a JDM BRZ / FR-S / GT86 Drivetrain Package?

A matched JDM drivetrain package can offer several advantages over buying the transmission and differential separately.

Benefits include:

• Genuine OEM Subaru/Toyota drivetrain components
• 6-speed manual transmission
• Matching 4.10 rear differential
• Factory-style Torsen LSD configuration
• FA20 / 4U-GSE compatibility
• RWD drivetrain
• 2013–2016 application
• Actual inventory photos
• Low-mileage Japanese donor components
• 30-day limited warranty
• Nationwide shipping

Most importantly, buying the gearbox and rear differential together gives customers a matched factory-style drivetrain combination.

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, manual transmissions, automatic transmissions, CVTs, differentials, and drivetrain parts 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 Inventory Identification

This listing carries:

Item ID: 411
Product Code: ZN6 6MT
Final Drive: 4.10
Transmission: 6-Speed Manual

The live listing confirms those details and states that the rear differential is included.

Actual Product Photos

Use the actual inventory images to show both major components clearly.

Ideally, the photo set should include:

• Complete transmission
• Transmission identification
• Bellhousing
• Shifter/tailhousing
• Rear differential
• Differential label or casting
• Differential input flange
• Differential axle openings

Actual photos give customers much stronger fitment information than generic images.

Affordable Installation Available

The live product page advertises affordable installation.

Keep that information prominently near the purchase button.

Nationwide Shipping

J-Spec Auto Sports can palletize the transmission and differential together for nationwide freight shipment.

Shipping cost depends on:

• Destination ZIP code
• Commercial or residential delivery
• Liftgate requirements
• Freight-terminal availability
• Delivery location

Inspect the pallet and both drivetrain components for visible freight damage before accepting delivery.

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.

30-Day Limited Warranty

This Item ID 411 listing currently carries a 30-day warranty.

Review the complete warranty terms before installation and keep receipts for:

• Manual transmission lubricant
• Rear differential oil
• Replacement seals
• Clutch service
• Professional installation
• Related drivetrain maintenance

FREQUENTLY ASKED QUESTIONS

What transmission does a 2013–2016 Subaru BRZ manual use?

Compatible 2013–2016 BRZ models use a 6-speed manual RWD transmission paired with the naturally aspirated 2.0L FA20 boxer engine.

Does this package include the rear differential?

Yes. This Item ID 411 listing specifically includes the 6-speed manual transmission and matching 4.1 rear differential.

What is the final-drive ratio?

The factory 2013–2016 manual BRZ uses a 4.100 final-drive ratio.

Is the rear differential limited-slip?

Subaru factory specifications identify the BRZ as using a Torsen limited-slip rear differential.

Is this a 6-speed manual?

Yes. This product uses a 6-speed manual transmission.

What engine works with this transmission?

This listing targets compatible 2.0L FA20 / Toyota 4U-GSE applications.

Is it rear-wheel drive?

Yes. The BRZ, FR-S, and GT86 use a rear-wheel-drive platform.

Will it fit a 2013 Subaru BRZ?

It targets compatible 2013 BRZ 6-speed manual applications.

Will it fit a 2014 Subaru BRZ?

Yes, when the original drivetrain configuration matches.

Will it fit a 2015 Subaru BRZ?

It targets compatible 2015 BRZ manual applications.

Will it fit a 2016 Subaru BRZ?

Yes, for compatible 2016 BRZ 6-speed manual applications.

Will this fit a Scion FR-S?

Yes, it targets compatible 2013–2016 Scion FR-S 6-speed manual applications.

Will this fit a Toyota GT86?

It targets compatible 2013–2016 Toyota GT86 manual applications.

Will it fit a 2017 BRZ?

Do not assume direct fitment. Subaru changed the manual final drive to 4.30 for 2017, while this package uses 4.10.

What are the manual gear ratios?

The factory ratios are 3.626, 2.188, 1.541, 1.213, 1.000, and 0.767, with 3.437 reverse.

Does this package include a clutch?

Do not assume so. Only components shown in the photos or specifically listed should be considered included.

Should I replace the clutch while installing the transmission?

If the clutch has significant mileage or wear, replacing it while the transmission is already removed can save considerable labor later.

Should I change the rear differential oil?

Yes. Starting the included differential with fresh, correct-specification lubricant provides a known maintenance baseline.

Is this transmission rebuilt?

No, unless specifically stated otherwise. This listing represents a used low-mileage JDM/OEM drivetrain package.

Does it have a warranty?

Yes. The current Item ID 411 listing has a 30-day limited warranty.

Do you offer installation?

Yes. The live listing advertises affordable installation.

Do you ship nationwide?

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

How do I verify fitment?

Provide your:

• Vehicle year
• VIN
• Make/model
• Engine information
• Original transmission identification
• Original rear differential information
• Photos of the transmission
• Photos of the differential
• Photos of mounting and electrical connections

Compare the bellhousing, shifter configuration, mounts, driveshaft interface, differential housing, axle connections, and final-drive configuration before installation.

Order Your JDM BRZ / FR-S / GT86 6-Speed + 4.10 Differential Package

If your 2013–2016 Subaru BRZ, Scion FR-S, or Toyota GT86 needs a replacement manual drivetrain, this low-mileage JDM 6-speed manual transmission and matching 4.10 rear differential package provides an OEM-based replacement option for compatible FA20 / 4U-GSE RWD applications.

Unlike a transmission-only listing, Item ID 411 includes both the gearbox and matching rear differential, making it an attractive package for customers who need to replace both components.

J-Spec Auto Sports provides actual inventory photos, nationwide freight shipping, installation options, and a 30-day limited warranty.

Verify the complete transmission and differential configuration before ordering.