Subaru Subaru Forester 2003-2008 4EAT Transmission Specifications
This document provides detailed technical specifications for the 4EAT (4-Speed Electronic Automatic Transmission) used in the 2003-2008 Subaru Forester. It includes gear ratios, fluid capacity, torque converter specifications, and shift patterns. These specifications are essential for mechanics, enthusiasts, and owners performing maintenance, repairs, or upgrades. The data ensures proper compatibility and performance, helping users make informed decisions about transmission servicing or replacement. This resource is particularly valuable for those referencing service manuals or seeking to understand the transmission's design and functionality.
Overview Specifications
This document provides detailed specifications and technical information about the 4EAT (4-speed Electronic Automatic Transmission) used in the 2003-2008 Subaru Forester. It is designed to assist mechanics, enthusiasts, and owners in understanding the transmission's features, maintenance requirements, and performance characteristics. Use this guide to navigate through sections, search for specific details, and access quick-reference specifications.
How to Use
Use the search functionality to find specific terms or topics related to the 4EAT transmission. Enter keywords like 'gear ratios' or 'fluid capacity' to quickly locate relevant information.
Navigate through the document using the section titles and subsections. Each section is organized to provide a logical flow of information, from general overviews to detailed technical points.
Key Specifications
Transmission Type
4-speed Automatic
Gear Ratios
2.785:1 to 0.694:1
Torque Capacity
250 lb-ft
Fluid Capacity
9.5 quarts
Service Interval
30,000 miles
Available Specifications
Transmission Design
This section covers the design and engineering of the 4EAT transmission, including its construction, components, and how it integrates with the Subaru Forester's drivetrain.
Transmission Design
This section covers the design and engineering of the 4EAT transmission, including its construction, components, and how it integrates with the Subaru Forester's drivetrain.
Construction and Components
- Aluminum alloy casing for reduced weight
- Hydraulic torque converter for smooth power delivery
- Planetary gearset for efficient power distribution
- Electronically controlled valve body for precise shifting
- Sealed bearings for durability
- Integrated cooling system for optimal temperature management
Integration with Drivetrain
- Compatible with Subaru's Symmetrical All-Wheel Drive (AWD) system
- Direct connection to the engine via a flexplate
- Supports both manual and automatic shift modes
- Designed for longitudinal engine placement
- Includes a transfer case for AWD functionality
Performance Specifications
This section provides detailed performance metrics and specifications for the 4EAT transmission, including gear ratios, torque capacity, and shift patterns.
Performance Specifications
This section provides detailed performance metrics and specifications for the 4EAT transmission, including gear ratios, torque capacity, and shift patterns.
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
- Final Drive Ratio: 4.111:1
Torque Capacity
- Maximum torque capacity: 250 lb-ft
- Designed for engines up to 2.5L displacement
- Supports high-torque applications with reinforced internals
- Optimized for smooth shifting under load
Maintenance and Service
This section outlines maintenance requirements, service intervals, and common issues associated with the 4EAT transmission in the 2003-2008 Subaru Forester.
Maintenance and Service
This section outlines maintenance requirements, service intervals, and common issues associated with the 4EAT transmission in the 2003-2008 Subaru Forester.
Fluid Requirements
- Recommended fluid: Subaru ATF-HP
- Fluid capacity: 9.5 quarts (including torque converter)
- Fluid change interval: Every 30,000 miles
- Use of incorrect fluid can cause shifting issues
Common Issues
- Delayed shifting in cold weather
- Solenoid valve failures
- Torque converter clutch issues
- Fluid leaks from seals or gaskets
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed electronically controlled
- Platform
- Subaru Forester 2003-2008
- 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
- 1.18 inches (30 mm)
- Output Shaft Diameter
- 1.57 inches (40 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
- Electronic throttle control
- Shift Control
-
- Electronic shift logic
- Manual shift mode
- Adaptive shift programming
- Cooling
-
- Integrated transmission cooler
- External cooler compatibility
- Temperature monitoring
- Durability
-
- Reinforced gear sets
- High-capacity clutch packs
- Sealed bearings
- Safety
-
- Fail-safe mode
- Overheat protection
- Torque reduction during shifts
Safety Features
- Electronic Protections
-
- Over-rev protection
- Overheat shutdown
- Low fluid detection
- Mechanical Protections
-
- Shear pin in torque converter
- Reinforced output shaft
- Driver Alerts
-
- Transmission temperature warning
- Check engine light for faults
Comfort Features
- Shift Quality
-
- Smooth shift transitions
- Reduced shift shock
- Adaptive shift timing
- Noise Reduction
-
- Helical cut gears
- Vibration dampening mounts
- Sealed transmission casing
- Driving Modes
-
- Sport mode
- Winter mode
- Eco mode
Accessories
- Cooling
-
- External transmission cooler
- Thermostatic cooler kit
- Cooling line adapters
- Performance
-
- Shift kit
- High-capacity torque converter
- Upgraded clutch packs
- Maintenance
-
- Transmission fluid pump
- Filter kit
- Seal replacement kit
Maintenance
- Service interval
- 30,000 miles or 24 months
- Service Items
-
- Fluid and filter replacement
- Seal inspection
- Shift linkage adjustment
- Cooling system check
- Electronic control unit diagnostics
- Maintenance Notes
- Use only Subaru-approved ATF for optimal performance.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Parts and labor
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission components
- Corrosion
- Miles: UnlimitedYears: 5Coverage: Casing and external parts
- Extended
- Miles: 100,000Years: 7Coverage: Optional extended coverage
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Laser alignment
- Quality Control
- Testing: Dyno testing, Pressure testing, Temperature cyclingStandards: ISO 9001, JIS D 2001
- Sustainability Practices
-
- Recycled aluminum usage
- Low-emission manufacturing
- Waste reduction programs
- Production Metrics
- Annual Output: 150,000 unitsDefect 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 shift linkage
- Test electronic controls
- Inspect cooling system
Use only Subaru-approved ATF for optimal performance.
- Replace transmission filter
- Inspect clutch packs
- Check torque converter
- Test shift solenoids
- Inspect cooling lines
Special tools required for solenoid testing.
- Replace clutch packs
- Inspect gear sets
- Test transmission mounts
- Flush cooling system
- Perform full diagnostic scan
Major service interval; consider professional inspection.
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 2003-2008 Subaru Forester is specifically designed for this model and may not be directly compatible with other Subaru vehicles without modifications. It is crucial to verify the transmission code and ensure compatibility with the engine, drivetrain, and mounting points. For specific compatibility queries, consult the vehicle’s service manual or a Subaru dealership.
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. Key tasks include checking and replacing the transmission fluid every 30,000 to 60,000 miles, inspecting the transmission filter, and ensuring the cooling system is functioning properly. Additionally, monitor for signs of wear, such as slipping gears or unusual noises, and address them promptly to avoid costly repairs.
Q3 How do I replace the 4EAT transmission in a Subaru Forester?
How do I replace the 4EAT transmission in a Subaru Forester?
Replacing the 4EAT transmission involves several steps: 1) Disconnect the battery and remove the driveshaft. 2) Detach the transmission mounts and linkage. 3) Support the engine and remove the transmission bolts. 4) Carefully lower the transmission and replace it with the new unit. 5) Reassemble in reverse order, ensuring all connections are secure and torqued to specifications. Always refer to the service manual for detailed instructions.
Q4 What are common troubleshooting steps for the 4EAT transmission?
What are common troubleshooting steps for the 4EAT transmission?
Common issues with the 4EAT transmission include delayed shifting, slipping gears, or fluid leaks. Start by checking the transmission fluid level and condition. Inspect for leaks around the seals and gaskets. If the issue persists, use a diagnostic scanner to check for error codes. For complex problems, consult a professional technician or refer to the service manual for detailed diagnostic procedures.
Q5 How can I optimize the performance of the 4EAT transmission?
How can I optimize the performance of the 4EAT transmission?
To optimize the 4EAT transmission, regularly change the transmission fluid using manufacturer-recommended products. Avoid aggressive driving and ensure the cooling system is functioning properly to prevent overheating. Upgrading the transmission cooler or using performance additives can also enhance longevity and performance. Regular inspections and addressing minor issues promptly will maintain smooth operation.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Subaru Forester 2003-2008 Service Manual
Coming SoonThis comprehensive manual provides detailed instructions for maintenance, repair, and troubleshooting of the Subaru Forester, including the 4EAT transmission.
Technical Service Bulletin for 4EAT Transmission
Coming SoonThis bulletin outlines common issues, updates, and fixes for the 4EAT transmission in the 2003-2008 Subaru Forester.
Subaru Forester Parts and Accessories Catalog
Coming SoonThis catalog lists all genuine parts and accessories for the 2003-2008 Subaru Forester, including transmission components.
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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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