SKU: LSD 182 L15 | UPC: 4996338017123
Cusco LSD RS-1.5 (2way) Rear 1993-2014 Subaru Impreza GC8 GDB GRB GVB STI
The Cusco LSD RS-1.5 (2way) Rear installs directly into Subaru Impreza GC8 GDB GRB GVB chassis models like 2004-2007 WRX STI to replace the factory open differential. This clutch-type limited slip differential distributes power evenly to both rear wheels for improved acceleration out of corners and stability under load. Drivers experience consistent traction during hard launches and high-speed turns on road or track.
Key Features
- RS 1.5-way clutch operation: Locks fully on acceleration and partially on deceleration using 8 initial clutch plates plus 4 acceleration and 2 deceleration plates for smooth responsive handling.
- Adjustable preload: Three shim thicknesses allow tuning of initial torque from 100-300Nm to suit street rally or drift setups.
- WPC-treated gears: Shot-peened chrome-molybdenum bevel gears resist fatigue and scoring under high torque up to 627Nm capacity.
- High carbon steel case: Forged housing matches OEM strength while reducing weight versus aluminum alternatives.
- Rebuildable design: Serviceable clutch packs and bearings extend lifespan with routine maintenance.
Product Notes
- Fill with Cusco Super LSD oil or 75W-90 GL-5 gear oil rated for LSD after installation.
- Complete 250-mile break-in period avoiding full-throttle launches or track use.
- Product weight 53 lbs includes all components ready for direct fitment.
Installation Notes
- Professional installation recommended.
- Remove rear subframe and differential carrier accessing R180 housing bolts.
- Compatible with OEM axles driveshafts and prop shaft no modifications needed.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2004-2007 | Subaru | Impreza | WRX STI |
| 2007 | Subaru | Impreza | WRX STI Limited |
| 1993-2000 | Subaru | Impreza | WRX GC8 |
| 2001-2007 | Subaru | Impreza | WRX STI GDB |
| 2007-2011 | Subaru | Impreza | WRX GRB |
| 2007-2014 | Subaru | Impreza | WRX STI GVB |
Why Choose Cusco?
- Established JDM leader supplying World Rally Championship teams since 1989.
- Every unit hand-assembled in Japan with rigorous dyno testing.
- Engineered for Subaru AWD systems proven in drift gymkhana and circuit racing.
Frequently Asked Questions
- Q: Will this fit my 2004-2007 USDM Subaru Impreza WRX STI?
A: Yes direct bolt-in replacement for R180 rear differential housing on all 2004-2007 WRX STI models including hatchback and sedan. - Q: What materials are used in construction?
A: Case made from high carbon steel gears from chrome-moly steel with WPC micro-peening treatment and Toray nylon plates for clutch packs. - Q: What is the warranty coverage?
A: One-year limited warranty from purchase date covers manufacturing defects with proof of professional installation.
Shipping & Handling
- Method: UPS or FedEx Ground
- Availability: In stock – ships same or next business day
- Packaging: Original Cusco cardboard box measures 19.5 x 16.5 x 11 inches
- Weight: 55 lbs shipping weight
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