Subaru Subaru Legacy 2005-2009 Drivetrain Specifications
Explore the 2005-2009 Subaru Legacy drivetrain specifications, including AWD system details, transmission types, and differential configurations. Ideal for mechanics, enthusiasts, and owners seeking repair, maintenance, and upgrade insights.
Overview Specifications
This document provides detailed specifications and technical information about the drivetrain of the 2005-2009 Subaru Legacy. It is designed to help users understand the key components, configurations, and performance characteristics of the vehicle's drivetrain. Use the search and navigation instructions to quickly find specific details or explore the sections for a comprehensive understanding.
How to Use
Use the search functionality to locate specific terms or components within the document. Enter keywords such as 'transmission' or 'AWD system' to find relevant sections quickly.
Navigate through the document by scrolling through the sections or using the table of contents. Each section is organized into subsections for easy access to detailed information.
Key Specifications
Transmission Types
5-speed manual, 4-speed/5-speed automatic
AWD System
Symmetrical AWD standard
Center Differential
Viscous coupling, 50:50 torque split
Rear Differential
Open or limited-slip optional
Fuel Efficiency
20-28 MPG combined
Available Specifications
Transmission Options
This section covers the available transmission types for the 2005-2009 Subaru Legacy, including manual and automatic options. It also details the gear ratios and performance characteristics of each transmission type.
Transmission Options
This section covers the available transmission types for the 2005-2009 Subaru Legacy, including manual and automatic options. It also details the gear ratios and performance characteristics of each transmission type.
Manual Transmission
- 5-speed manual transmission standard on base models
- Gear ratios optimized for balanced performance and fuel efficiency
- Dual-mass flywheel for smoother operation
- Short-throw shifter available on performance trims
Automatic Transmission
- 4-speed automatic available on most trims
- 5-speed automatic optional on higher trims
- Sportshift manual mode for enhanced control
- Adaptive shift logic for improved responsiveness
All-Wheel Drive System
This section explains the Subaru Symmetrical All-Wheel Drive (AWD) system, which is standard on all 2005-2009 Legacy models. It covers the system's design, functionality, and benefits.
All-Wheel Drive System
This section explains the Subaru Symmetrical All-Wheel Drive (AWD) system, which is standard on all 2005-2009 Legacy models. It covers the system's design, functionality, and benefits.
Symmetrical AWD Design
- Equal-length driveshafts for balanced power distribution
- Continuous AWD with no need for driver intervention
- Improved traction and stability in all conditions
- Lightweight design for better fuel efficiency
Performance Benefits
- Enhanced cornering stability
- Improved acceleration on slippery surfaces
- Reduced wheel spin during hard acceleration
- Better overall handling and control
Differential and Drivetrain Components
This section provides details about the differential and other key drivetrain components, including their roles in power distribution and vehicle performance.
Differential and Drivetrain Components
This section provides details about the differential and other key drivetrain components, including their roles in power distribution and vehicle performance.
Center Differential
- Viscous coupling center differential standard on all models
- Torque split of 50:50 front to rear under normal conditions
- Automatic torque redistribution based on traction needs
- Durable design for long-term reliability
Rear Differential
- Open differential standard on most trims
- Limited-slip differential optional on performance models
- Improved traction during cornering
- Reduced understeer in high-performance driving
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Component Specifications
Overview
- Type
- All-Wheel Drive (AWD)
- Configuration
- Symmetrical AWD
- Platform
- Subaru Legacy Platform
- Material
- Aluminum and Steel
- Location
- Front-engine, longitudinal
Dimensions
- Transmission Length
- 29.5 inches (749 mm)
- Driveshaft Diameter
- 2.5 inches (63.5 mm)
- Differential Width
- 18.7 inches (475 mm)
- Axle Length
- 31.1 inches (790 mm)
- Transfer Case Height
- 9.8 inches (249 mm)
- Clutch Diameter
- 9.4 inches (239 mm)
- Propeller Shaft Length
- 45.3 inches (1150 mm)
Materials
- Transmission Case
- Aluminum alloy
- Driveshaft
- High-strength steel
- Differential Housing
- Cast iron
- Axles
- Forged steel
- Clutch Plate
- Ceramic composite
Features
- Transmission
-
- 5-speed manual
- 4-speed automatic
- 5-speed automatic (optional)
- Sportshift mode (automatic models)
- Differential
-
- Limited-slip rear differential
- Open front differential
- Viscous coupling center differential
- Driveshaft
-
- Balanced for high-speed operation
- Rubber dampers for vibration reduction
- Spline connection for torque transfer
- Axles
-
- Constant velocity (CV) joints
- Sealed for life
- High-angle articulation
- Clutch
-
- Hydraulic actuation
- Self-adjusting mechanism
- High thermal capacity
Safety Features
- Stability Control
-
- Vehicle Dynamics Control (VDC)
- Traction Control System (TCS)
- Braking
-
- Electronic Brake-force Distribution (EBD)
- Anti-lock Braking System (ABS)
- Structural
-
- Reinforced driveshaft tunnel
- Crash-resistant differential mounts
Comfort Features
- Noise Reduction
-
- Insulated transmission tunnel
- Vibration-dampening mounts
- Shifting
-
- Smooth gear transitions
- Short-throw shifter (manual models)
- Handling
-
- Predictable AWD behavior
- Balanced weight distribution
Accessories
- Performance
-
- Short-throw shifter kit
- Upgraded clutch kit
- Performance differential oil
- Protection
-
- Driveshaft loop
- Differential skid plate
- Transmission cooler
- Maintenance
-
- Fluid pump for differential service
- Transmission fluid dipstick
- CV joint boot repair kit
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Transmission fluid change
- Differential oil replacement
- CV joint inspection
- Driveshaft balance check
- Clutch adjustment (manual models)
- Maintenance Notes
- Use only Subaru-approved fluids for optimal performance.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Bumper-to-bumper
- Powertrain
- Miles: 60,000Years: 5Coverage: Drivetrain components
- Corrosion
- Miles: UnlimitedYears: 5Coverage: Perforation only
- Emissions
- Miles: 80,000Years: 8Coverage: Federal emissions components
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision casting for differential housing
- CNC machining for transmission components
- Robotic assembly for drivetrain units
- Quality Control
- Testing: Dyno testing for transmission, Vibration analysis for driveshaft, Thermal cycling for differentialinspection: X-ray inspection for castings, Ultrasonic testing for welds, Magnetic particle inspection for axles
- Sustainability
-
- Recycled aluminum in transmission cases
- Closed-loop coolant system
- Waste oil recycling program
- 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 CV joints and boots
- Check transmission fluid level
- Inspect driveshaft for balance
- Check differential oil condition
- Lubricate clutch release mechanism (manual models)
Use only Subaru-approved fluids for optimal performance.
- Replace transmission fluid
- Replace differential oil
- Inspect clutch wear (manual models)
- Check driveshaft U-joints
- Test AWD system operation
Special tools required for differential service.
- Replace clutch assembly (manual models)
- Rebuild or replace CV joints
- Check transmission mounts
- Inspect differential bearings
- Perform full AWD system diagnostic
Major service may require dealership-specific equipment.
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 What drivetrain configurations are compatible with the 2005-2009 Subaru Legacy?
What drivetrain configurations are compatible with the 2005-2009 Subaru Legacy?
The 2005-2009 Subaru Legacy is compatible with both all-wheel drive (AWD) and front-wheel drive (FWD) configurations. The AWD system, known as Symmetrical All-Wheel Drive, is standard on most models and ensures balanced power distribution to all four wheels. The Legacy GT and 3.0R models exclusively feature AWD, while base models may offer FWD. The drivetrain includes a 5-speed manual or 4-speed/5-speed automatic transmission, depending on the trim and engine type.
Q2 What maintenance is required for the Legacy's drivetrain?
What maintenance is required for the Legacy's drivetrain?
Regular maintenance for the 2005-2009 Subaru Legacy drivetrain includes checking and replacing transmission fluid every 30,000 miles, inspecting the driveshaft and CV joints for wear, and ensuring the differential fluid is changed every 60,000 miles. Additionally, monitor the AWD system for proper operation, especially in harsh driving conditions. Regular tire rotation and alignment checks are crucial to maintain drivetrain efficiency and prevent uneven wear.
Q3 How do I replace the driveshaft on a 2005-2009 Subaru Legacy?
How do I replace the driveshaft on a 2005-2009 Subaru Legacy?
To replace the driveshaft, first, secure the vehicle on a lift or jack stands. Remove the exhaust system and heat shields for access. Unbolt the driveshaft from the differential and transmission, marking the alignment for reinstallation. Slide the old driveshaft out and install the new one, ensuring proper alignment. Reattach all bolts and components, then test drive the vehicle to confirm smooth operation. Always refer to the service manual for torque specifications.
Q4 What should I do if my Legacy's AWD system is not functioning properly?
What should I do if my Legacy's AWD system is not functioning properly?
If the AWD system malfunctions, first check the fuse related to the AWD control module. Inspect the tires for uneven wear or incorrect sizing, as this can affect the system. Verify the condition of the driveshaft, CV joints, and differential. Use a diagnostic tool to check for error codes in the AWD control unit. If the issue persists, consult a certified Subaru technician for further diagnosis and repair.
Q5 How can I optimize the performance of my Legacy's drivetrain?
How can I optimize the performance of my Legacy's drivetrain?
To optimize drivetrain performance, use high-quality transmission and differential fluids recommended by Subaru. Upgrade to performance tires for better traction and handling. Regularly inspect and replace worn components like CV joints and driveshafts. Consider installing a performance clutch or torque converter for manual and automatic transmissions, respectively. Ensure proper alignment and tire pressure to reduce strain on the drivetrain and improve overall efficiency.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2005-2009 Subaru Legacy Service Manual
Coming SoonThis comprehensive manual covers all aspects of the Legacy's drivetrain, including maintenance, repair, and troubleshooting procedures.
Subaru Technical Service Bulletin 05-49-08
Coming SoonThis bulletin addresses common drivetrain issues in the 2005-2009 Legacy, including AWD system diagnostics and repair recommendations.
Subaru Legacy Drivetrain Parts Catalog
Coming SoonThis catalog provides detailed information on OEM drivetrain components, including part numbers, compatibility, and installation guidelines.
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Technical Information
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