Which cars does the Type RS 1-Way Rear LSD for SG9 fit?

Cusco USA lists part number LSD 183 F for the Subaru Forester (SG9, SH9, SKF, SJG/SJF, SF9, 1998-2023), the Subaru Crosstrek (GT7, GP7, 2013-2023), the Subaru WRX (VAG, 2015-2021) and the other cars listed under Applications. The Type RS 1-Way Rear LSD for SG9 replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.

What does 1-way mean?

A 1-way LSD locks only under acceleration. When the driver lifts or brakes it stays open like a factory diff, so the car turns in and rotates freely off the throttle. It is the most forgiving setting for a car that is also driven on the street, and the least likely to make the car push on corner entry.

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.

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Description

Cusco Type RS 1-Way Rear LSD for SG9 Subaru Forester, Crosstrek, WRX and Outback

Cusco’s Type RS 1-Way Rear LSD for SG9 and related Subaru models replaces the factory rear differential with a clutch-type limited-slip unit that uses coil springs to set its initial torque. In 1-way form it locks under acceleration only and stays open off the throttle, so turn-in feels close to stock. 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 road car that also sees track days.

Features

Coil-spring initial torque system with RS springs inside the pressure rings
1-way action: locks on acceleration only
Smoother, quicker engagement than the Cusco MZ series
Clutch-type multi-plate design in place of the factory rear differential

Specifications

Cusco part number: LSD 183 F
Type: Type RS
Action: 1-way
Cusco setting: 1 way (1-way 55/0 & 2-way 55/55 deg) – R160 Diff Size
Initial torque: 5-7 kgf-m (approx. 36-51 lb-ft)
Cusco case size: C-size
Position: Rear differential

Applications

Subaru Forester: SG9 | 2003-2008
Subaru Impreza: GC8 | 1993-2001
Subaru Crosstrek: GT7 | 2018-2023
Subaru Legacy / Outback: BL (Sedan) / BP (Wagon) | 2005-2009
Subaru Outback: BR9 | 2010-2014
Subaru Impreza 2.5RS Coupe: GC8 2-Door Coupe | 1998-2001
Subaru Forester: SH9 | 2009-2013
Subaru Forester: SKF | 2019-2023
Subaru Impreza WRX: GDA | 2002-2007
Subaru WRX: VAG | 2015-2021
Subaru Legacy: BM9/BMF | 2010-2014
Subaru Forester: SJG/SJF | 2014-2018
Subaru Legacy: BE5 | 2000-2004
Subaru Impreza WRX Wagon: GGA | 2001-2007
Subaru Impreza WRX Hatchback: GH8 | 2008-2014
Subaru Forester: SF9 | 1998-2002
Subaru Legacy: BL (Sedan) / BP (Wagon) | 2005-2009
Subaru Crosstrek: GP7 | 2013-2017

Notes

Fitting the Type RS 1-Way Rear LSD for SG9 means removing the differential carrier to swap the differential; installation labor is not included
Cusco: For R160 Diff Size – CUSCO LSD C-Size

Frequently Asked Questions

Which cars does the Type RS 1-Way Rear LSD for SG9 fit? Cusco USA lists part number LSD 183 F for the Subaru Forester (SG9, SH9, SKF, SJG/SJF, SF9, 1998-2023), the Subaru Crosstrek (GT7, GP7, 2013-2023), the Subaru WRX (VAG, 2015-2021) and the other cars listed under Applications. The Type RS 1-Way Rear LSD for SG9 replaces the factory rear differential, so check the notes on this page for any model or transmission limits before ordering.
What does 1-way mean? A 1-way LSD locks only under acceleration. When the driver lifts or brakes it stays open like a factory diff, so the car turns in and rotates freely off the throttle. It is the most forgiving setting for a car that is also driven on the street, and the least likely to make the car push on corner entry.
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.

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Cusco Type RS 1-Way Rear LSD for SG9 Subaru Forester, Crosstrek, WRX and Outback [LSD 183 F]

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Cusco Type RS 1-Way Rear LSD for SG9 Subaru Forester, Crosstrek, WRX and Outback

Features

Specifications

Applications

Notes

Frequently Asked Questions

About CUSCO

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