Subaru Subaru Legacy 1994-1999 4EAT Transmission Specifications
This document provides detailed technical specifications for the 4EAT (4-speed Electronic Automatic Transmission) used in the 1994-1999 Subaru Legacy. It includes gear ratios, torque converter specifications, fluid capacity, and shift patterns, along with maintenance intervals and compatibility details. These specifications are essential for mechanics, enthusiasts, and owners looking to understand, maintain, or repair their vehicle's transmission. The information is sourced from official Subaru service manuals and technical guides, ensuring accuracy and reliability. Whether you're diagnosing issues, performing upgrades, or simply learning 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 (4-speed Electronic Automatic Transmission) used in Subaru Legacy models from 1994 to 1999. It is designed to assist enthusiasts, mechanics, and owners in understanding the transmission's features, maintenance requirements, and performance characteristics. Use the search and navigation instructions to quickly find relevant information.
How to Use
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Key Specifications
Transmission Type
4EAT (4-speed Electronic Automatic)
Torque Capacity
250 Nm
Fluid Capacity
9.5 liters
Shift Times
0.3 seconds
Service Interval
60,000 miles
Available Specifications
Transmission Design and Features
This section covers the design principles and key features of the 4EAT transmission, including its electronic control system, gear configuration, and durability enhancements.
Transmission Design and Features
This section covers the design principles and key features of the 4EAT transmission, including its electronic control system, gear configuration, and durability enhancements.
Electronic Control System
- Utilizes a TCU (Transmission Control Unit) for precise gear shifts
- Adaptive shift logic for improved performance and fuel efficiency
- Integrated sensors for monitoring transmission fluid temperature and pressure
- Fail-safe mode to protect the transmission during system errors
Gear Configuration
- 4 forward gears and 1 reverse gear
- Wide gear ratios for optimal performance across driving conditions
- Lock-up torque converter for reduced slippage and improved efficiency
- Overdrive (4th gear) for highway cruising
Performance Specifications
This section provides detailed performance metrics for the 4EAT transmission, including torque capacity, shift times, and compatibility with Subaru Legacy engines.
Performance Specifications
This section provides detailed performance metrics for the 4EAT transmission, including torque capacity, shift times, and compatibility with Subaru Legacy engines.
Torque Capacity
- Rated for up to 250 Nm of torque
- Designed to handle both naturally aspirated and turbocharged engines
- Robust clutch packs for enhanced durability
- Suitable for AWD (All-Wheel Drive) configurations
Shift Times
- Average shift time of 0.3 seconds under normal conditions
- Quick downshifts for improved acceleration
- Smooth upshifts for passenger comfort
- Adaptive shift patterns based on throttle input
Maintenance and Service
This section outlines maintenance requirements and service intervals for the 4EAT transmission, including fluid changes, filter replacements, and common troubleshooting tips.
Maintenance and Service
This section outlines maintenance requirements and service intervals for the 4EAT transmission, including fluid changes, filter replacements, and common troubleshooting tips.
Fluid Requirements
- Use only Subaru-approved ATF (Automatic Transmission Fluid)
- Recommended fluid change interval: 60,000 miles or 5 years
- Fluid capacity: Approximately 9.5 liters
- Check fluid level regularly using the dipstick
Common Issues
- Delayed engagement when shifting into Drive or Reverse
- Slipping gears due to worn clutch packs
- Transmission overheating in high-stress conditions
- Check engine light triggered by TCU error codes
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed electronically controlled
- Platform
- Subaru Legacy
- Material
- Aluminum alloy casing
- Location
- Front-engine, all-wheel drive
Dimensions
- Length
- 28.5 in (724 mm)
- Width
- 22.8 in (579 mm)
- Height
- 17.3 in (439 mm)
- Weight
- 145 lbs (65.8 kg)
- input Shaft Diameter
- 0.98 in (25 mm)
- Output Shaft Diameter
- 1.18 in (30 mm)
- Fluid Capacity
- 9.5 quarts (9 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Friction material with steel plates
- Seals
- Synthetic rubber
- Fluid
- ATF Type T-II
Features
- Electronic Control
-
- Adaptive shift control
- Manual mode override
- Torque converter lockup
- Drivetrain
-
- Full-time all-wheel drive
- Viscous center differential
- Rear limited-slip differential
- Cooling
-
- Integrated transmission cooler
- Fluid temperature sensor
- Safety
-
- Fail-safe mode
- Overheat protection
- Neutral safety switch
- Performance
-
- Smooth shift transitions
- Optimized gear ratios
- Efficient power transfer
Safety Features
- Electronic Protection
-
- Fail-safe mode
- Overheat protection
- Mechanical Protection
-
- Neutral safety switch
- Parking pawl lock
Comfort Features
- Driving Experience
-
- Smooth shift transitions
- Adaptive shift control
- Noise Reduction
-
- Quiet operation
- Vibration dampening
- User interface
-
- Manual mode override
- Gear position display
Accessories
- Upgrades
-
- Performance torque converter
- Heavy-duty transmission cooler
- Synthetic ATF fluid
- Tools
-
- Transmission jack
- Fluid pump
- Diagnostic scanner
- Maintenance Kits
-
- Filter and gasket kit
- Seal kit
- Fluid exchange kit
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Fluid and filter change
- Seal inspection
- Shift linkage adjustment
- Cooler line inspection
- Diagnostic scan
- Maintenance Notes
- Use only ATF Type T-II fluid for optimal performance
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Parts and labor
- Powertrain
- Miles: 60,000Years: 5Coverage: Major components
- Corrosion
- Miles: UnlimitedYears: 7Coverage: Perforation only
- Emissions
- Miles: 50,000Years: 8Coverage: Federal requirements
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision machining
- Automated assembly
- Quality testing
- Quality Control
- inspection: 100% functional testingStandards: ISO 9001 certified
- Sustainability Practices
-
- Recycled aluminum usage
- Efficient production methods
- Waste reduction initiatives
- Production Metrics
- Annual Output: 150,000 unitsDefect Rate: 0.1%
Service Information for 4eat transmission Service
Maintenance and service requirements specific to this component
- ATF fluid and filter change
- Seal and gasket inspection
- Shift linkage adjustment
- Cooler line inspection
- Diagnostic scan
Use only ATF Type T-II fluid for optimal performance
- Comprehensive fluid flush
- Clutch pack inspection
- Torque converter check
- Electronic control module test
- Transmission mount inspection
Special tools required for torque converter inspection
- Transmission overhaul
- Clutch pack replacement
- Seal and gasket replacement
- Fluid cooler flush
- Full diagnostic and recalibration
Critical to inspect for wear and replace components as needed
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 in 1994-1999 Subaru Legacy models is specifically designed for these vehicles. While it may share similarities with other Subaru models, compatibility is not guaranteed. Always verify part numbers and consult technical documentation before attempting cross-model installation. The 4EAT is optimized for the Legacy's engine and drivetrain configuration, ensuring proper performance and reliability.
Q2 What are the maintenance requirements for the 4EAT transmission?
What are the maintenance requirements for the 4EAT transmission?
Regular maintenance for the 4EAT transmission includes fluid changes every 30,000-60,000 miles, depending on driving conditions. Inspect for leaks, replace the transmission filter, and ensure proper fluid levels. Use only Subaru-approved ATF for optimal performance. Periodic checks of the transmission mount and linkage are also recommended to prevent wear and ensure smooth operation.
Q3 How do I replace the 4EAT transmission in a 1994-1999 Subaru Legacy?
How do I replace the 4EAT transmission in a 1994-1999 Subaru Legacy?
To replace the 4EAT transmission, first disconnect the battery and drain the transmission fluid. Remove the driveshaft, exhaust components, and crossmember. Disconnect electrical connectors, shift linkage, and cooling lines. Support the engine, then unbolt and lower the transmission. Installation is the reverse of removal, ensuring proper alignment and torque specifications. Refill with Subaru-approved ATF and test for leaks and proper operation.
Q4 What are common troubleshooting steps for 4EAT transmission issues?
What are common troubleshooting steps for 4EAT transmission issues?
Common issues include slipping gears, delayed engagement, or unusual noises. Check fluid levels and condition first. Inspect for leaks, damaged wiring, or faulty sensors. Use a diagnostic scanner to check for error codes. If problems persist, inspect the valve body, torque converter, or internal components. Regular maintenance and timely repairs can prevent major failures.
Q5 How can I optimize the performance of my 4EAT transmission?
How can I optimize the performance of my 4EAT transmission?
To optimize performance, use high-quality Subaru-approved ATF and ensure proper fluid levels. Regularly inspect and replace the transmission filter. Avoid excessive towing or aggressive driving. Consider upgrading the transmission cooler for better heat dissipation. Periodic software updates or tuning can also enhance shift responsiveness and overall 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.
1994-1999 Subaru Legacy 4EAT Service Manual
Coming SoonComprehensive guide covering installation, maintenance, and troubleshooting for the 4EAT transmission.
Subaru Technical Service Bulletin for 4EAT Transmission
Coming SoonDetails common issues, updates, and fixes for the 4EAT transmission in 1994-1999 Legacy models.
Subaru Legacy 4EAT Parts and Accessories Catalog
Coming SoonLists compatible parts, accessories, and replacement components for the 4EAT 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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