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SKU: LSD 183 L15 | UPC: 4996338017185
Cusco LSD RS 1.5way Rear GDA/GGA WRX BR9 BM9 2002-2007 Subaru Impreza WRX
Cusco LSD RS 1.5way is a clutch-type limited slip differential designed for the rear axle of 2002-2007 Subaru Impreza WRX models including GDA/GGA chassis WRX BR9 BM9. This rear LSD delivers strong traction on acceleration for better corner exit speed and controlled slip on deceleration for stability. Ideal for street autocross drift and track driving it replaces the stock open differential with proven performance gains.
Key Features
- 1.5-Way Operation: Full lock under acceleration locks both wheels for maximum drive power partial lock on deceleration maintains balance and control
- Type-RS Ramp Design: 50-degree accel 30-degree decel ramps with 6 clutch plates ensure smooth progressive engagement without abrupt chatter
- WPC Shot Peening: Surface treatment on pinion and side gears boosts durability reduces wear extends lifespan under high torque loads
- 2.0-3.5:1 Torque Bias: Transfers power to wheel with grip prevents one-wheel spin improves acceleration out of corners
- Precision Japan Build: CNC machined components chromoly steel construction direct fit to OEM rear diff case no modifications needed
Product Notes
- Direct replacement for factory rear differential on compatible WRX models
- Fill with Cusco LSD oil after install for optimal clutch plate life and performance
- 23 lbs product weight ships in 12 x 12 x 12 inch box
Installation Notes
- Professional installation recommended.
- Requires rear differential removal and clutch pack replacement
- Uses OEM mounting hardware and ring gear bolts
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2002-2007 | Subaru | Impreza | WRX |
| 2006-2007 | Subaru | Impreza | WRX Limited |
| 2006-2007 | Subaru | Impreza | WRX TR |
Why Choose Cusco?
- Motorsport proven in D1GP Super Taikyu and rally series
- High-strength materials withstand 400+ lb-ft torque
- Engineered tolerances match Subaru OEM specs for reliability
Frequently Asked Questions
-
Q: Does this fit 2004 GDA WRX sedan?
A: Yes direct fit for all 2002-2005 GDA chassis Impreza WRX sedan hatch including USDM JDM models -
Q: What materials are used?
A: Chromoly steel gears chromed clutch plates with WPC treatment for heat resistance and smooth operation -
Q: What is the warranty?
A: Cusco 1-year manufacturer defect warranty requires proper fluid and install
Shipping &. Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Original Cusco box 12 x 12 x 12 inches
- Weight: 23 lbs
Cusco
Cusco is a Japanese performance parts manufacturer with over 40 years of motorsports experience, producing coilovers, suspension braces, differentials, roll cages, and chassis reinforcement components for top sport compact and all-wheel-drive platforms. Cusco parts are built to motorsport tolerances and are used by professional race teams competing in Japanese domestic market racing series alongside street performance enthusiasts worldwide.Popular UpgradesCusco coilover kits, strut tower braces, and rear member braces are the most popular products for Subaru WRX and STI, Toyota 86 and GR86, Mazda Miata, Honda Civic, and Mitsubishi Evo platforms. Cusco limited-slip differentials and differential braces provide improved traction and reduced chassis flex for track and autocross builds on AWD platforms. Cusco adjustable control arms and camber kits allow precise alignment correction after lowering springs or coilovers are installed.What chassis bracing does Cusco make for the Subaru WRX...
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