Subaru Subaru Legacy 2004-2008 5EAT Transmission Specifications
This document provides detailed technical specifications for the 5EAT (5-speed Electronic Automatic Transmission) used in the 2004-2008 Subaru Legacy. It includes gear ratios, torque converter specifications, fluid capacity, and maintenance intervals. These specifications are essential for mechanics, enthusiasts, and owners looking to understand the transmission's performance, ensure proper maintenance, or diagnose issues. The data is sourced from official Subaru service manuals and technical guides, ensuring accuracy and reliability. Whether you're performing routine maintenance, upgrading components, or troubleshooting, this resource offers valuable insights into the 5EAT transmission's design and operation.
Overview Specifications
This document provides detailed specifications and technical information about the 5EAT (5-speed Electronic Automatic Transmission) used in the 2004-2008 Subaru Legacy. It is designed for enthusiasts, mechanics, and owners seeking to understand the transmission's features, maintenance, and performance. Use the search and navigation instructions to quickly find relevant sections or refer to the quick reference table for key specifications.
How to Use
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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
Gear Ratios
1st: 3.540, 2nd: 2.264, 3rd: 1.471, 4th: 1.000, 5th: 0.834, Reverse: 3.333
Fluid Capacity
9.5 quarts (9.0 liters)
Torque Capacity
250 lb-ft (339 Nm)
Weight
165 lbs (75 kg)
Compatibility
All-wheel-drive (AWD) models
Available Specifications
Transmission Design and Features
This section covers the design principles and key features of the 5EAT transmission, including its electronic control system, gear configuration, and performance enhancements.
Transmission Design and Features
This section covers the design principles and key features of the 5EAT transmission, including its electronic control system, gear configuration, and performance enhancements.
Electronic Control System
- Utilizes a TCU (Transmission Control Unit) for precise gear shifts
- Adaptive learning capability for driver behavior
- Integrated with Subaru's Vehicle Dynamics Control (VDC) system
- Supports manual shift mode for enhanced control
Gear Configuration
- 5 forward gears and 1 reverse gear
- Wide gear ratio spread for improved acceleration and fuel efficiency
- Planetary gearset design for compact packaging
- Torque converter with lock-up clutch for reduced slippage
Performance and Maintenance
This section provides insights into the performance characteristics of the 5EAT transmission and essential maintenance practices to ensure longevity and reliability.
Performance and Maintenance
This section provides insights into the performance characteristics of the 5EAT transmission and essential maintenance practices to ensure longevity and reliability.
Performance Characteristics
- Smooth and responsive gear shifts
- Optimized for both city driving and highway cruising
- Capable of handling up to 250 lb-ft of torque
- Designed for all-wheel-drive compatibility
Maintenance Guidelines
- Recommended transmission fluid: Subaru ATF-HP
- Fluid change interval: Every 60,000 miles
- Inspect for leaks and wear during routine service
- Reset TCU adaptations after fluid changes
Common Issues and Troubleshooting
This section addresses common problems associated with the 5EAT transmission and provides troubleshooting tips for diagnosing and resolving issues.
Common Issues and Troubleshooting
This section addresses common problems associated with the 5EAT transmission and provides troubleshooting tips for diagnosing and resolving issues.
Common Problems
- Delayed or harsh shifting
- Transmission fluid leaks
- Torque converter shudder
- Error codes related to solenoid valves
Troubleshooting Tips
- Check fluid level and condition regularly
- Inspect wiring harness for damage or corrosion
- Use a diagnostic scanner to read TCU error codes
- Replace worn solenoid valves if necessary
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Transmission Specifications
Overview
- Type
- 5-speed automatic
- Configuration
- Longitudinal
- Platform
- Subaru Legacy 2004-2008
- Material
- Aluminum alloy casing
- Location
- Front-engine, all-wheel-drive
Dimensions
- Length
- 28.5 inches (724 mm)
- Width
- 22.8 inches (579 mm)
- Height
- 18.3 inches (465 mm)
- Weight
- 165 lbs (75 kg)
- input Shaft Diameter
- 1.2 inches (30.5 mm)
- Output Shaft Diameter
- 1.1 inches (28 mm)
- Fluid Capacity
- 10.5 quarts (9.9 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction materials
- Seals
- Viton rubber
- Sensors
- Stainless steel and plastic
Features
- Drivetrain Integration
-
- Symmetrical all-wheel drive
- Active torque split control
- Vehicle Dynamics Control (VDC)
- Shift Control
-
- Sportshift manual mode
- Adaptive shift logic
- Grade logic control
- Cooling
-
- Integrated transmission cooler
- Thermostatically controlled fluid flow
- External cooler compatibility
- Electronic Controls
-
- CAN bus communication
- Transmission Control Module (TCM)
- Fail-safe mode
- Performance
-
- Wide gear ratio spread
- Smooth shift quality
- High torque capacity
Safety Features
- Electronic Protections
-
- Overheat protection
- Over-rev protection
- Torque reduction during shifts
- Mechanical Protections
-
- Shear pin in torque converter
- Reinforced clutch packs
- High-strength gear teeth
Comfort Features
- Shift Quality
-
- Smooth automatic shifts
- Adaptive shift patterns
- Reduced shift shock
- Noise Vibration
-
- Precision gear machining
- Dual-mass flywheel
- Isolated mounting points
- Driver Assistance
-
- Hill holder function
- Creep mode for low speeds
- Manual shift override
Accessories
- Performance Upgrades
-
- High-capacity transmission cooler
- Shift kit
- Reinforced clutch packs
- Maintenance Tools
-
- Transmission fluid pump
- Differential socket set
- Transmission jack adapter
- Diagnostic Equipment
-
- Subaru Select Monitor III
- OBD-II scanner
- Transmission pressure gauge
Maintenance
- Service interval
- 30,000 miles or 24 months
- Service Items
-
- Transmission fluid and filter change
- Inspect for leaks
- Check transmission mounts
- Inspect drive shafts
- Reset adaptive shift logic
- Maintenance Notes
- Use only Subaru ATF-HP fluid for optimal performance.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Bumper-to-bumper
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission and drivetrain
- Corrosion
- Miles: UnlimitedYears: 5Coverage: Perforation only
- Emissions
- Miles: 80,000Years: 8Coverage: Federal emissions components
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Laser alignment
- Quality Control
- inspection Stages: 12Testing Procedures: Pressure testing, Shift quality analysis, Durability testing
- Sustainability Practices
-
- Recycled aluminum usage
- Closed-loop fluid systems
- Energy-efficient manufacturing
- Production Metrics
- Units Per Day: 450Defect Rate: 0.02%Lead Time: 5 days
Service Information for 5eat transmission Service
Maintenance and service requirements specific to this component
- Inspect transmission fluid level and condition
- Check for leaks at seals and connections
- Inspect transmission mounts
- Reset adaptive shift logic
- Check transmission control module for error codes
Use only Subaru ATF-HP fluid for top-ups or changes
- Replace transmission fluid and filter
- Inspect and adjust shift linkage
- Check torque converter operation
- Inspect drive shafts and CV joints
- Perform transmission pressure test
Special tools required for pressure testing
- Complete transmission fluid flush
- Inspect and replace worn clutch packs
- Check valve body operation
- Inspect and replace solenoids if necessary
- Perform full transmission diagnostic
Major service requiring transmission removal
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 5EAT transmission compatible with other Subaru models?
Is the 5EAT transmission compatible with other Subaru models?
The 5EAT transmission used in the 2004-2008 Subaru Legacy is specifically designed for this model and may not be directly compatible with other Subaru vehicles without modifications. It is recommended to consult the vehicle's service manual or a certified Subaru technician for compatibility details and potential cross-model applications.
Q2 What are the maintenance requirements for the 5EAT transmission?
What are the maintenance requirements for the 5EAT transmission?
The 5EAT transmission requires regular maintenance, including fluid changes every 30,000 to 60,000 miles, depending on driving conditions. Inspect the transmission fluid for color and consistency, and replace the filter if necessary. Regularly check for leaks and ensure the transmission control module software is up to date to maintain optimal performance.
Q3 How do I replace the 5EAT transmission in my Subaru Legacy?
How do I replace the 5EAT transmission in my Subaru Legacy?
Replacing the 5EAT transmission involves several steps: disconnect the battery, remove the driveshaft, unbolt the transmission mounts, and detach the wiring harness and fluid lines. Lower the transmission using a jack and install the new unit in reverse order. Ensure proper alignment and torque specifications. Consult the service manual for detailed instructions.
Q4 What should I do if my 5EAT transmission is slipping or shifting roughly?
What should I do if my 5EAT transmission is slipping or shifting roughly?
If the 5EAT transmission is slipping or shifting roughly, check the transmission fluid level and condition. Low or contaminated fluid can cause these issues. Inspect the transmission control module for error codes and ensure the software is updated. If problems persist, consult a certified technician for further diagnosis.
Q5 How can I optimize the performance of my 5EAT transmission?
How can I optimize the performance of my 5EAT transmission?
To optimize the 5EAT transmission, use high-quality transmission fluid and ensure regular maintenance. Consider upgrading the transmission control module software for improved shift logic. Avoid excessive towing or aggressive driving, as these can strain the transmission. Regularly inspect and replace worn components to maintain peak performance.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
2004-2008 Subaru Legacy 5EAT Service Manual
Coming SoonComprehensive guide covering installation, maintenance, and troubleshooting for the 5EAT transmission.
Subaru Technical Service Bulletin for 5EAT Transmission
Coming SoonLatest updates and fixes for common issues with the 5EAT transmission.
Subaru Legacy 5EAT Parts Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts for the 5EAT transmission.
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We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.
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.
- Always follow the manufacturer's recommended procedures and safety precautions.
- Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
- If you're unsure about any procedure, consult a qualified professional mechanic.
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