Subaru Subaru Outback 1994-1999 4EAT Transmission Specifications
This document provides detailed specifications for the 4EAT (4-speed Electronic Automatic Transmission) used in the 1994-1999 Subaru Outback. It includes technical data such as gear ratios, torque converter specifications, fluid capacity, and shift patterns. These specifications are essential for mechanics, enthusiasts, and owners looking to understand, maintain, or repair their vehicle's transmission. The information is sourced from factory service manuals and technical guides, ensuring accuracy and reliability. Whether you're diagnosing issues, performing upgrades, or simply learning more about your vehicle, 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 (Electronic Automatic Transmission) used in the 1994-1999 Subaru Outback. It is designed to assist enthusiasts, mechanics, and owners in understanding 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
Use the search functionality to locate specific terms or topics within the document. Enter keywords related to the 4EAT transmission, such as 'torque converter' or 'gear ratios,' to find relevant sections quickly.
Navigate through the document using the section titles and subsections. Each major section is organized into detailed subsections, making it easy to find specific technical details about the 4EAT transmission.
Key Specifications
Transmission Type
4-Speed Automatic (4EAT)
Fluid Capacity
10.5 quarts
Final Drive Ratio
4.111:1
Torque Converter Stall Speed
2200-2400 RPM
Shift Solenoids
3 (Shift A, Shift B, Lock-up)
Available Specifications
Transmission Design
This section covers the design and architecture of the 4EAT transmission, including its components and how they work together to deliver smooth and efficient performance in the 1994-1999 Subaru Outback.
Transmission Design
This section covers the design and architecture of the 4EAT transmission, including its components and how they work together to deliver smooth and efficient performance in the 1994-1999 Subaru Outback.
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 Converter
- Lock-up torque converter for improved efficiency
- Stall speed: 2200-2400 RPM
- Hydraulic control system for smooth engagement
- Integrated with the transmission control module (TCM)
Performance and Maintenance
This section provides information on the performance characteristics of the 4EAT transmission and essential maintenance practices to ensure longevity and reliability.
Performance and Maintenance
This section provides information on the performance characteristics of the 4EAT transmission and essential maintenance practices to ensure longevity and reliability.
Fluid Specifications
- Recommended fluid: Dexron III/Mercon ATF
- Fluid capacity: 10.5 quarts (including torque converter)
- Fluid change interval: Every 30,000-60,000 miles
- Use of Subaru-approved fluids for optimal performance
Common Issues
- Delayed shifting or harsh engagement
- Transmission fluid leaks
- Worn valve body causing erratic shifting
- Regular inspection of transmission mounts and seals
Control Systems
This section explains the electronic and hydraulic control systems that manage the 4EAT transmission's operation, including the transmission control module (TCM) and sensors.
Control Systems
This section explains the electronic and hydraulic control systems that manage the 4EAT transmission's operation, including the transmission control module (TCM) and sensors.
Transmission Control Module (TCM)
- Monitors throttle position, vehicle speed, and engine load
- Adjusts shift points for optimal performance
- Diagnostic capabilities for troubleshooting
- Integrated with the engine control module (ECM)
Sensors and Actuators
- Vehicle speed sensor (VSS) for gear selection
- Throttle position sensor (TPS) for load detection
- Shift solenoids for gear engagement
- Pressure control solenoid for line pressure regulation
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed with electronic control
- Platform
- Subaru Legacy/Outback
- Material
- Aluminum alloy casing
- Location
- Front longitudinal
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
- Fluid
- Dexron III/Mercon ATF
Features
- Electronic Control
-
- Adaptive shift control
- Manual mode override
- Torque converter lockup
- Fail-safe mode
- Drivetrain Integration
-
- Symmetrical AWD compatibility
- Active torque split
- Center differential lock
- Low-range capability
- Performance
-
- Smooth shift transitions
- Optimized gear ratios
- Reduced power loss
- Enhanced durability
- Cooling
-
- Integrated transmission cooler
- Fluid temperature sensor
- External cooler compatibility
- Diagnostics
-
- OBD-II compatibility
- Self-diagnostic system
- Shift solenoid monitoring
Safety Features
- Fail-Safe Mode
-
- Limits gear shifts in case of failure
- Maintains basic functionality
- Torque Management
-
- Prevents excessive torque to wheels
- Reduces drivetrain stress
- Overheat Protection
-
- Automatic downshift prevention
- Fluid temperature warning
Comfort Features
- Shift Quality
-
- Smooth gear transitions
- Reduced shift shock
- Noise Reduction
-
- Optimized gear meshing
- Vibration dampening
- Adaptive Control
-
- Adjusts to driving style
- Optimizes shift points
Accessories
- Cooling
-
- External transmission cooler
- Cooler lines
- Temperature gauge
- Performance
-
- Shift kit
- High-capacity torque converter
- Synthetic ATF
- Maintenance
-
- Transmission filter kit
- Fluid exchange pump
- Seal replacement kit
Maintenance
- Service interval
- 30,000 miles or 24 months
- Service Items
-
- Fluid and filter replacement
- Seal inspection
- Shift solenoid check
- Torque converter inspection
- Cooler line inspection
- Maintenance Notes
- Use only recommended ATF for optimal performance.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Parts and labor
- Powertrain
- Miles: 60,000Years: 5Coverage: Major components
- Corrosion
- Miles: UnlimitedYears: 5Coverage: Perforation only
- Emissions
- Miles: 80,000Years: 8Coverage: Federal requirements
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Quality testing
- Quality Control
- inspection: 100% component testingTolerance: ±0.001 inches
- Sustainability Practices
-
- Recycled aluminum usage
- Eco-friendly fluid options
- Energy-efficient production
- Production Metrics
- Units Per Day: 500Defect Rate: 0.1%
Service Information for 4eat transmission Service
Maintenance and service requirements specific to this component
- Fluid and filter replacement
- Seal inspection
- Shift solenoid check
- Torque converter inspection
- Cooler line inspection
Use only recommended ATF for optimal performance.
- Complete fluid flush
- Transmission mount inspection
- Valve body inspection
- Shift linkage adjustment
Special tools required for valve body service.
- Complete transmission overhaul
- Clutch pack replacement
- Torque converter rebuild
- Seal and gasket replacement
Critical to inspect all internal components for wear.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4EAT transmission compatible with other Subaru models from 1994-1999?
Is the 4EAT transmission compatible with other Subaru models from 1994-1999?
The 4EAT transmission used in the 1994-1999 Subaru Outback is specifically designed for this model and may not be directly compatible with other Subaru vehicles without modifications. Compatibility depends on factors like engine type, drivetrain configuration, and mounting points. Always verify with a Subaru dealer or technical expert 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 30,000-60,000 miles, inspecting the transmission pan for leaks, and ensuring the torque converter and solenoids are functioning properly. Regular servicing helps prevent overheating and wear, extending the transmission's lifespan.
Q3 How do I replace the 4EAT transmission in a 1994-1999 Subaru Outback?
How do I replace the 4EAT transmission in a 1994-1999 Subaru Outback?
Replacing the 4EAT transmission involves several steps: disconnect the battery, remove the driveshaft and exhaust components, detach the transmission mounts, and disconnect the wiring harness and fluid lines. Lower the transmission using a jack and install the new unit by reversing the process. Ensure proper alignment and torque specifications during reassembly.
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 issues. Inspect the solenoids, valve body, and torque converter for malfunctions. If problems persist, consult a professional for a diagnostic scan to identify potential electronic or mechanical failures.
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 to prevent overheating, especially during heavy towing or off-road use. Adjusting the shift points with a performance tuner can also enhance responsiveness and 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.
1994-1999 Subaru Outback Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and troubleshooting for the 1994-1999 Subaru Outback, including the 4EAT transmission.
4EAT Transmission Technical Bulletin
Coming SoonTechnical service bulletin addressing common issues and updates for the 4EAT transmission in 1994-1999 Subaru Outback models.
Subaru Outback Parts and Accessories Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts for the 1994-1999 Subaru Outback, 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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