Which cars does the Type RS 1.5-Way Rear LSD for GU fit?

Cusco USA lists part number LSD 6A6 C15 for the Subaru Crosstrek (GU, GT7, 2018-2026), the Subaru WRX (VBH, VAG, 2015-2026) and the Subaru Forester (SLG, 2024-2026). The Type RS 1.5-Way Rear LSD for GU replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.

What does 1.5-way mean?

A 1.5-way LSD locks fully under acceleration and partly under deceleration. The extra coast-side lock ties the driven wheels together when the driver lifts or brakes, which steadies the car on corner entry and under trail braking, at the cost of a little more push than a 1-way. It is a common choice for track cars.

How does the Type RS differ from the Type MZ?

The Type RS sets its initial torque with coil springs that push in the same direction as the activation pressure, so it engages smoothly and quickly with a lower initial torque. The Type MZ uses a high-pressure cone spring, giving it the highest initial torque of any Cusco LSD and a stronger, more linear lock suited to competition.

What initial torque does it use?

Cusco quotes 5 to 7 kgf-m of initial torque for this unit, which is the locking force the differential applies before the engine sends any power through it. Lower values feel smoother on the road; higher values hold the inside wheel harder on corner exit, and on the Type RS the figure can be changed by adding or removing RS springs.

What should I know before installing it?

The differential carrier must be removed from the car to fit the Cusco unit, so most owners have a drivetrain specialist do it. Plan on fresh gear oil, since Cusco sells its own LSD oil for clutch-type differentials, and read the notes on this page for any extra parts Cusco says the job needs.

Description

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Description

Cusco Type RS 1.5-Way Rear LSD for GU / GT7 Subaru Crosstrek, VBH / VAG Subaru WRX and SLG Subaru Forester

Cusco’s Type RS 1.5-Way Rear LSD for GU / GT7 Subaru Crosstrek, VBH / VAG Subaru WRX and SLG Subaru Forester replaces the factory rear differential with a clutch-type limited-slip unit that uses coil springs to set its initial torque. As a 1.5-way it locks fully under acceleration and partly on deceleration, which steadies the car on corner entry. Engagement is smoother and quicker than Cusco’s MZ series, and the low initial torque keeps tight turns easy when the diff is not working. Choose it for a car that is driven on the road and pushed hard on track.

Design and Performance

Small RS springs inside the pressure rings load the clutch plates before any drive torque arrives. Because they push in the same direction as the initial torque, the plates engage quickly and progressively, and adding or removing springs moves the initial torque up or down. Under power the cams add locking force in step with torque, so the Type RS 1.5-Way Rear LSD for GU holds the driven wheels together harder as the engine pulls harder.

Features

Coil-spring initial torque system with RS springs inside the pressure rings
1.5-way action: full lock on acceleration, partial on deceleration
Smoother, quicker engagement than the Cusco MZ series
Clutch-type multi-plate design in place of the factory rear differential
Built for the Crosstrek and related models

Specifications

Cusco part number: LSD 6A6 C15
Type: Type RS
Action: 1.5-way
Cusco setting: 1.5 way (1-way 45/0 & 1.5-way 55/20 deg)
Initial torque: 5-7 kgf-m (approx. 36-51 lb-ft)
Cusco case size: C-size
Position: Rear differential

Applications

Subaru Crosstrek: GU | 2024-2026
Subaru WRX: VBH | 2022-2026
Subaru Forester: SLG | 2024-2026
Subaru Crosstrek: GT7 | 2018-2023
Subaru WRX: VAG | 2015-2021

Notes

Fitting the Type RS 1.5-Way Rear LSD for GU means removing the differential carrier to swap the differential; installation labor is not included
Cusco: For R167 Diff Size – CUSCO LSD C-Size – Newer Subaru Differential Design
Cusco: Use LSD 183 Series for R160 Differential size

Frequently Asked Questions

Which cars does the Type RS 1.5-Way Rear LSD for GU fit? Cusco USA lists part number LSD 6A6 C15 for the Subaru Crosstrek (GU, GT7, 2018-2026), the Subaru WRX (VBH, VAG, 2015-2026) and the Subaru Forester (SLG, 2024-2026). The Type RS 1.5-Way Rear LSD for GU replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.
What does 1.5-way mean? A 1.5-way LSD locks fully under acceleration and partly under deceleration. The extra coast-side lock ties the driven wheels together when the driver lifts or brakes, which steadies the car on corner entry and under trail braking, at the cost of a little more push than a 1-way. It is a common choice for track cars.
How does the Type RS differ from the Type MZ? The Type RS sets its initial torque with coil springs that push in the same direction as the activation pressure, so it engages smoothly and quickly with a lower initial torque. The Type MZ uses a high-pressure cone spring, giving it the highest initial torque of any Cusco LSD and a stronger, more linear lock suited to competition.
What initial torque does it use? Cusco quotes 5 to 7 kgf-m of initial torque for this unit, which is the locking force the differential applies before the engine sends any power through it. Lower values feel smoother on the road; higher values hold the inside wheel harder on corner exit, and on the Type RS the figure can be changed by adding or removing RS springs.
What should I know before installing it? The differential carrier must be removed from the car to fit the Cusco unit, so most owners have a drivetrain specialist do it. Plan on fresh gear oil, since Cusco sells its own LSD oil for clutch-type differentials, and read the notes on this page for any extra parts Cusco says the job needs.

About CUSCO

CUSCO is the brand of Carrosser Co., Ltd., founded in December 1977 and based in Takasaki, Gunma Prefecture, Japan. Carrosser designs and builds coilovers, limited-slip differentials, clutches, roll cages and chassis parts, sells its steel cages under the Safety 21 name, and competes in every All Japan Championship category from circuit racing to rally and gymkhana. CUSCO USA, a division of Carrosser, is based in Huntington Beach, California.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Cusco Type RS 1.5-Way Rear LSD for GU / GT7 Subaru Crosstrek, VBH / VAG Subaru WRX and SLG Subaru Forester [LSD 6A6 C15]

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Cusco Type RS 1.5-Way Rear LSD for GU / GT7 Subaru Crosstrek, VBH / VAG Subaru WRX and SLG Subaru Forester

Design and Performance

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

Reviews