Subaru Subaru WRX 2002-2007 Drivetrain Specifications
Explore the detailed drivetrain specifications for the 2002-2007 Subaru WRX, including transmission, differential, and AWD system details. Essential for maintenance, repairs, and performance upgrades.
Overview Specifications
This document provides detailed specifications and technical information about the drivetrain of the 2002-2007 Subaru WRX. It is designed to assist enthusiasts, mechanics, and owners in understanding the vehicle's drivetrain components, performance characteristics, and maintenance requirements. Use the search functionality to locate specific terms or navigate through sections to explore detailed information about transmission, differentials, and other drivetrain-related systems.
How to Use
Use the search bar to enter keywords related to the drivetrain, such as 'transmission type' or 'differential ratio'. Results will highlight relevant sections and subsections for quick access.
Scroll through the document or use the table of contents to jump to specific sections. Each section is organized into subsections with detailed technical points for easy reference.
Key Specifications
Transmission Type
5-speed manual / 4-speed automatic
Differential Type
Viscous LSD (Rear)
Driveshaft Material
Steel
Axle Type
CV Joints
Torque Capacity
227 lb-ft
Available Specifications
Transmission
This section covers the transmission system of the 2002-2007 Subaru WRX, including its type, gear ratios, and performance characteristics. Learn about the manual and automatic transmission options, their durability, and common maintenance practices.
Transmission
This section covers the transmission system of the 2002-2007 Subaru WRX, including its type, gear ratios, and performance characteristics. Learn about the manual and automatic transmission options, their durability, and common maintenance practices.
Transmission Type
- 5-speed manual transmission (standard)
- 4-speed automatic transmission (optional)
- Symmetrical All-Wheel Drive (AWD) system
- Dual-range gearbox available in some markets
- Hydraulic clutch system for manual models
- Electronic control for automatic models
Gear Ratios
- 1st gear: 3.454
- 2nd gear: 1.947
- 3rd gear: 1.366
- 4th gear: 0.972
- 5th gear: 0.738
- Reverse gear: 3.333
Differentials
Explore the differential systems used in the 2002-2007 Subaru WRX, including front, rear, and center differentials. Understand their roles in power distribution and traction control, as well as their impact on handling and performance.
Differentials
Explore the differential systems used in the 2002-2007 Subaru WRX, including front, rear, and center differentials. Understand their roles in power distribution and traction control, as well as their impact on handling and performance.
Front Differential
- Open differential design
- Integrated with the transmission
- Supports AWD power distribution
- Durable construction for high torque
Rear Differential
- Viscous Limited-Slip Differential (LSD)
- Enhances traction during cornering
- Handles up to 227 lb-ft of torque
- Sealed for long-term reliability
Driveshaft and Axles
This section details the driveshaft and axle components of the 2002-2007 Subaru WRX. Learn about their construction, materials, and role in transferring power from the transmission to the wheels.
Driveshaft and Axles
This section details the driveshaft and axle components of the 2002-2007 Subaru WRX. Learn about their construction, materials, and role in transferring power from the transmission to the wheels.
Driveshaft
- Two-piece steel driveshaft
- Designed for AWD systems
- Balanced for smooth operation
- Reinforced for high-performance use
Axles
- CV (Constant Velocity) joints
- High-strength steel construction
- Sealed boots for protection
- Designed for high torque and durability
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Component Specifications
Overview
- Type
- All-Wheel Drive (AWD)
- Configuration
- Symmetrical AWD
- Platform
- Subaru Global Platform
- Material
- High-strength steel and aluminum
- Location
- Front-engine, longitudinal layout
Dimensions
- Driveshaft Length
- 56.3 inches (1430 mm)
- Rear Differential Width
- 22.8 inches (580 mm)
- Front Axle Diameter
- 1.5 inches (38 mm)
- Rear Axle Diameter
- 1.3 inches (33 mm)
- Transfer Case Length
- 14.2 inches (360 mm)
- Propeller Shaft Diameter
- 2.8 inches (71 mm)
- Center Differential Width
- 10.6 inches (270 mm)
Materials
- Driveshaft
- High-strength steel
- Differential Housing
- Aluminum alloy
- Axles
- Chromoly steel
- Transfer Case
- Aluminum with steel internals
- Propeller Shaft
- Carbon steel
Features
- Drivetrain Control
-
- Viscous coupling center differential
- Mechanical limited-slip rear differential
- Torque distribution monitoring
- Electronic throttle control integration
- Performance
-
- 50:50 torque split (default)
- Dynamic torque distribution
- High-traction mode
- Sport mode optimization
- Durability
-
- Reinforced driveshaft
- Sealed bearings
- Corrosion-resistant coatings
- High-temperature lubricants
- integration
-
- ABS system compatibility
- Traction control system integration
- Stability control system coordination
- Hill-start assist support
Safety Features
- Structural
-
- Reinforced drivetrain tunnel
- Crush zones for driveshaft
- Protected differential housing
- Electronic
-
- Traction control system
- Stability control system
- Torque vectoring
Comfort Features
- Noise Reduction
-
- Vibration-dampening mounts
- Insulated drivetrain tunnel
- Helical gear design
- Smoothness
-
- Balanced driveshaft
- Precision gear meshing
- Fluid-filled mounts
Accessories
- Performance
-
- Short-throw shifter
- Upgraded differential bushings
- High-performance clutch kit
- Protection
-
- Drivetrain skid plate
- Differential guard
- Axle boots
- Maintenance
-
- Drivetrain fluid kit
- Grease gun kit
- Bearing puller set
Maintenance
- Service interval
- 30,000 miles or 24 months
- Service Items
-
- Differential fluid replacement
- Driveshaft inspection
- Axle boot check
- Transfer case lubrication
- Propeller shaft balancing
- Maintenance Notes
- Use only Subaru-approved fluids for optimal performance
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Drivetrain components
- Powertrain
- Miles: 60,000Years: 5Coverage: Differentials and transfer case
- Corrosion
- Miles: UnlimitedYears: 5Coverage: Drivetrain housing
- Emissions
- Miles: 80,000Years: 8Coverage: Drivetrain-related emissions components
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision casting
- CNC machining
- Heat treatment
- Dynamic balancing
- Quality Control
- Testing: Durability testing, Vibration analysis, Thermal cyclingStandards: ISO 9001, JIS D 0201, SAE J2928
- Sustainability Practices
-
- Recycled aluminum usage
- Closed-loop lubrication systems
- Energy-efficient manufacturing
- Production Metrics
- Units Per Day: 1200Defect Rate: 0.02%Energy Usage: 15 kWh per unit
Service Information for drivetrain Service
Maintenance and service requirements specific to this component
- Inspect driveshaft for wear
- Check differential fluid level
- Inspect axle boots for cracks
- Lubricate transfer case
- Verify torque distribution
Use only Subaru Extra-High Temperature Gear Oil
- Replace differential fluid
- Inspect propeller shaft balance
- Check center differential operation
- Test viscous coupling performance
- Verify drivetrain mounts
Requires specialized diagnostic tools
- Complete drivetrain overhaul
- Replace all seals and gaskets
- Inspect and replace worn bearings
- Balance entire drivetrain assembly
- Test all electronic controls
Recommended to perform at authorized Subaru service center
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What drivetrain components are compatible with the 2002-2007 Subaru WRX?
What drivetrain components are compatible with the 2002-2007 Subaru WRX?
The 2002-2007 Subaru WRX features a symmetrical all-wheel-drive system with a 5-speed manual transmission. Compatible components include the EJ205 or EJ255 turbocharged engines, viscous coupling center differential, and rear limited-slip differential. Upgrades like STI 6-speed transmissions or aftermarket differentials may require additional modifications. Always verify compatibility with your specific model year and trim.
Q2 What are the maintenance requirements for the WRX drivetrain?
What are the maintenance requirements for the WRX drivetrain?
Regular maintenance includes changing the transmission and differential fluids every 30,000-60,000 miles, inspecting CV joints and boots for wear, and checking for leaks. The clutch should be inspected every 50,000 miles, and the driveshaft should be lubricated as needed. Follow the manufacturer's service intervals and use recommended fluids to ensure optimal performance and longevity.
Q3 How do I replace the clutch on a 2002-2007 Subaru WRX?
How do I replace the clutch on a 2002-2007 Subaru WRX?
To replace the clutch, first, disconnect the battery and remove the transmission. Unbolt the pressure plate and clutch disc, then install the new clutch components, ensuring proper alignment. Reinstall the transmission, reconnect all components, and bleed the clutch hydraulic system. Torque all bolts to factory specifications and test the clutch operation before driving.
Q4 What should I do if my WRX drivetrain makes unusual noises?
What should I do if my WRX drivetrain makes unusual noises?
Unusual noises may indicate worn CV joints, failing differentials, or transmission issues. Inspect the CV boots for tears and check for fluid leaks. If the noise persists, perform a diagnostic test to identify the source. Common solutions include replacing worn components, refilling or replacing fluids, and addressing misalignment or improper torque settings.
Q5 How can I optimize the performance of my WRX drivetrain?
How can I optimize the performance of my WRX drivetrain?
To optimize performance, consider upgrading to a lightweight flywheel, high-performance clutch, and aftermarket differentials. Use high-quality synthetic fluids for the transmission and differentials. Ensure proper alignment and balance of drivetrain components. Regularly inspect and maintain the system to prevent wear and improve responsiveness.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2002-2007 Subaru WRX Service Manual
Coming SoonComprehensive guide covering maintenance, repairs, and technical specifications for the WRX drivetrain and other systems.
Subaru Technical Service Bulletin: Drivetrain Noise
Coming SoonAddresses common drivetrain noise issues and provides recommended solutions for 2002-2007 WRX models.
Subaru WRX Performance Parts Catalog
Coming SoonCatalog of OEM and aftermarket performance parts, including drivetrain upgrades for the 2002-2007 WRX.
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Technical Information
- All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
- Vehicle specifications and procedures may vary by model year, trim level, and region.
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