Subaru Subaru Legacy 2004-2008 4EAT Transmission Specifications
This document provides detailed technical specifications for the 4EAT (4-speed Electronic Automatic Transmission) used in the 2004-2008 Subaru Legacy. It includes gear ratios, fluid capacity, torque converter specifications, and maintenance intervals. These specifications are essential for mechanics, enthusiasts, and owners looking to understand the transmission's performance, ensure proper maintenance, or plan upgrades. The data is sourced from official Subaru service manuals and technical guides, ensuring accuracy and reliability. Whether you're diagnosing issues, performing repairs, or optimizing performance, this resource offers valuable insights into the 4EAT transmission's design and operation.
Overview Specifications
This document provides detailed specifications and technical information about the 4EAT (4-speed Electronic Automatic Transmission) used in the 2004-2008 Subaru Legacy. It is designed for mechanics, enthusiasts, and owners seeking to understand the transmission's features, maintenance, and performance. Use this guide to navigate through sections, search for specific details, and access quick-reference specifications for the 4EAT transmission.
How to Use
Use the search functionality to quickly locate specific terms or topics within the document. Enter keywords related to the 4EAT transmission, such as 'gear ratios' or 'fluid capacity,' to find relevant information.
Navigate through the document by scrolling through the sections or using the table of contents. Each section is organized into subsections with detailed technical points for easy reference.
Key Specifications
Transmission Type
4-speed automatic
Gear Ratios
2.785:1 (1st) to 0.694:1 (4th)
Fluid Capacity
9.5 quarts
Torque Handling
Up to 250 lb-ft
Weight
Approx. 150 lbs
Available Specifications
Transmission Design
This section covers the design and engineering of the 4EAT transmission, including its construction, components, and operational principles. Learn about the transmission's layout, materials, and how it integrates with the Subaru Legacy's drivetrain.
Transmission Design
This section covers the design and engineering of the 4EAT transmission, including its construction, components, and operational principles. Learn about the transmission's layout, materials, and how it integrates with the Subaru Legacy's drivetrain.
Construction and Layout
- 4-speed automatic transmission with electronic control
- Longitudinal mounting for AWD compatibility
- Aluminum alloy casing for reduced weight
- Integrated torque converter for smooth power delivery
- Sealed design for durability and reduced maintenance
Key Components
- Planetary gear sets for compact design
- Hydraulic control system for precise shifting
- Electronic sensors for real-time monitoring
- Valve body for fluid pressure regulation
- Differential for AWD power distribution
Performance Specifications
Explore the performance characteristics of the 4EAT transmission, including gear ratios, shift points, and torque handling. This section provides insights into how the transmission enhances the driving experience of the Subaru Legacy.
Performance Specifications
Explore the performance characteristics of the 4EAT transmission, including gear ratios, shift points, and torque handling. This section provides insights into how the transmission enhances the driving experience of the Subaru Legacy.
Gear Ratios
- 1st gear: 2.785:1
- 2nd gear: 1.545:1
- 3rd gear: 1.000:1
- 4th gear: 0.694:1
- Reverse gear: 2.272:1
Shift Points
- Smooth upshifts at 2,500-3,500 RPM under normal driving
- Downshifts optimized for engine braking
- Adaptive shift logic for varying driving conditions
- Manual mode for driver-controlled shifting
Maintenance and Service
This section provides guidelines for maintaining and servicing the 4EAT transmission. Learn about fluid requirements, inspection intervals, and common issues to ensure long-term reliability.
Maintenance and Service
This section provides guidelines for maintaining and servicing the 4EAT transmission. Learn about fluid requirements, inspection intervals, and common issues to ensure long-term reliability.
Fluid Requirements
- Recommended fluid: Subaru ATF-HP
- Fluid capacity: 9.5 quarts (including torque converter)
- Fluid change interval: Every 30,000-60,000 miles
- Use of non-recommended fluids may void warranty
Common Issues
- Delayed engagement in cold weather
- Slipping gears due to worn clutch packs
- Fluid leaks from aging seals
- Check engine light for transmission-related codes
Search Specifications
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Type to search through torque specifications. Results will appear below as you type.
Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed with electronic control
- Platform
- Subaru Legacy 2004-2008
- Material
- Aluminum alloy casing
- Location
- Front-engine, all-wheel-drive configuration
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
- 9.5 quarts (9 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction materials
- Seals
- Nitrile rubber
- Cooling Lines
- Steel with rubber hoses
Features
- Drivetrain Integration
-
- Symmetrical all-wheel drive
- Active torque split control
- Electronic throttle control integration
- Shift Control
-
- Manual shift mode
- Sport mode
- Winter mode
- Adaptive shift logic
- Cooling System
-
- Integrated transmission cooler
- External cooler compatibility
- Temperature monitoring
- Electronic Controls
-
- CAN bus communication
- Diagnostic port integration
- Fail-safe mode
- Durability Features
-
- Reinforced clutch packs
- High-capacity torque converter
- Sealed bearings
Safety Features
- Fail-Safe Modes
-
- Limp-home mode
- Overheat protection
- Pressure monitoring
- Shift interlock
-
- Park lock solenoid
- Brake-shift interlock
- Key lock system
Comfort Features
- Shift Quality
-
- Smooth shift patterns
- Adaptive shift logic
- Reduced shift shock
- Noise Reduction
-
- Helical cut gears
- Vibration dampening mounts
- Sealed transmission casing
- Driver Assistance
-
- Hill holder function
- Grade logic control
- Creep function
Accessories
- Performance Upgrades
-
- High-capacity transmission cooler
- Shift kit
- Reinforced clutch packs
- Maintenance Tools
-
- Transmission fluid pump
- Diagnostic scanner
- Seal installation tool
- Replacement Parts
-
- Filter kit
- Gasket set
- Solenoid pack
Maintenance
- Service interval
- 30,000 miles or 24 months
- Service Items
-
- Fluid and filter replacement
- Seal inspection
- Solenoid testing
- Shift linkage adjustment
- Cooling system check
- Maintenance Notes
- Use only Subaru-approved ATF fluid for optimal performance.
Warranty
- Basic Warranty
- Miles: 36,000Years: 3Coverage: Parts and labor
- Powertrain Warranty
- Miles: 60,000Years: 5Coverage: Transmission components
- Extended Warranty
- Miles: 100,000Years: 7Coverage: Optional extended coverage
- Warranty Terms
- Warranty void if improper fluids or modifications are used.
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Laser alignment
- Quality Control
- Testing: Durability testing, Shift pattern analysis, Pressure testinginspection: Dimensional accuracy, Material integrity, Seal integrity
- Sustainability Practices
-
- Recycled aluminum usage
- Eco-friendly fluid options
- Energy-efficient manufacturing
- Production Metrics
- Units Per Year: 150,000Defect Rate: 0.05%Lead Time: 4 weeks
Service Information for 4eat transmission Service
Maintenance and service requirements specific to this component
- Replace transmission fluid
- Inspect seals and gaskets
- Check solenoid operation
- Adjust shift linkage
- Inspect cooling system
Use only Subaru-approved ATF fluid.
- Replace transmission filter
- Test clutch pack operation
- Inspect torque converter
- Check electronic controls
- Perform diagnostic scan
Special tools required for solenoid testing.
- Replace clutch packs if needed
- Inspect and replace seals
- Flush cooling system
- Test transmission pressure
- Perform full diagnostic
Major service may require transmission removal.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4EAT transmission compatible with other Subaru models?
Is the 4EAT transmission compatible with other Subaru models?
The 4EAT transmission used in the 2004-2008 Subaru Legacy is specifically designed for this model range. While it may share similarities with other Subaru transmissions, compatibility with other models is limited. Always verify part numbers and consult a Subaru dealer or technical guide before attempting cross-model installations.
Q2 What are the maintenance requirements for the 4EAT transmission?
What are the maintenance requirements for the 4EAT transmission?
The 4EAT transmission requires regular maintenance to ensure optimal performance. This includes checking and replacing the transmission fluid every 30,000 to 60,000 miles, inspecting the transmission pan for leaks, and ensuring the torque converter is functioning properly. Regular servicing by a qualified technician is recommended to maintain longevity and performance.
Q3 How do I replace the 4EAT transmission in a 2004-2008 Subaru Legacy?
How do I replace the 4EAT transmission in a 2004-2008 Subaru Legacy?
Replacing the 4EAT transmission involves several steps: disconnect the battery, remove the driveshaft, detach the transmission mounts, and disconnect all electrical connectors and fluid lines. Lower the transmission using a jack and install the new unit in reverse order. Ensure proper alignment and torque specifications are followed. Professional assistance is recommended for this complex procedure.
Q4 What should I do if my 4EAT transmission is slipping or not shifting properly?
What should I do if my 4EAT transmission is slipping or not shifting properly?
If your 4EAT transmission is slipping or not shifting, start by checking the transmission fluid level and condition. Low or contaminated fluid can cause these issues. Inspect the transmission control module and sensors for faults. If problems persist, consult a professional for a diagnostic scan and potential repairs or replacements.
Q5 How can I optimize the performance of my 4EAT transmission?
How can I optimize the performance of my 4EAT transmission?
To optimize the 4EAT transmission, use high-quality transmission fluid and ensure regular maintenance. Consider upgrading the transmission cooler for better heat dissipation, especially if towing or driving in harsh conditions. Avoid aggressive driving and ensure the transmission is properly tuned for your vehicle's engine and drivetrain setup.
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 4EAT Transmission Service Manual
Coming SoonThis manual provides detailed instructions for servicing and repairing the 4EAT transmission, including diagrams, torque specifications, and troubleshooting tips.
Subaru Technical Service Bulletin for 4EAT Transmission
Coming SoonThis bulletin addresses common issues and updates for the 4EAT transmission, including software updates and part replacements.
Subaru Legacy 4EAT Transmission Parts Catalog
Coming SoonThis catalog lists all available parts and accessories for the 4EAT transmission, including part numbers and compatibility information.
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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.
- 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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