Subaru Subaru WRX 1992-2001 4EAT Transmission Specifications
This document provides detailed technical specifications for the 4EAT (4-speed Electronic Automatic Transmission) used in the 1992-2001 Subaru WRX models. It includes gear ratios, torque converter specifications, fluid capacity, and maintenance intervals. These specifications are essential for mechanics, enthusiasts, and owners looking to understand, maintain, or upgrade their transmission. The data is sourced from official Subaru service manuals and technical bulletins, ensuring accuracy and reliability. Whether you're diagnosing issues, planning a rebuild, 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 1992-2001 Subaru WRX. It is designed for enthusiasts, mechanics, and anyone seeking in-depth knowledge about this transmission system. Use this guide to understand its features, maintenance requirements, and performance characteristics. The document is organized into sections for easy navigation and includes a quick reference table for key specifications.
How to Use
Use the search function to quickly 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 information.
Navigate through the document using the section titles and subsections. Each major section covers a specific aspect of the 4EAT transmission, with detailed points listed under each subsection for easy reference.
Key Specifications
Transmission Type
4-Speed Automatic
Torque Capacity
250 lb-ft
Fluid Capacity
9.5 quarts
Final Drive Ratio
4.111:1
Weight
Approx. 150 lbs
Available Specifications
Transmission Design
This section covers the fundamental design and architecture of the 4EAT transmission, including its components and how they work together to deliver smooth and efficient power transfer.
Transmission Design
This section covers the fundamental design and architecture of the 4EAT transmission, including its components and how they work together to deliver smooth and efficient power transfer.
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
- Designed for smooth engagement and reduced slippage
- Integrated with the transmission control module (TCM)
Performance Characteristics
This section explores the performance aspects of the 4EAT transmission, including its handling of power, shift patterns, and adaptability to different driving conditions.
Performance Characteristics
This section explores the performance aspects of the 4EAT transmission, including its handling of power, shift patterns, and adaptability to different driving conditions.
Shift Patterns
- Adaptive shift logic for varying driving conditions
- Manual mode with selectable gears
- Smooth upshifts and downshifts under normal driving
- Firm shifts during aggressive acceleration
Power Handling
- Rated for up to 250 lb-ft of torque
- Designed for Subaru's symmetrical AWD system
- Capable of handling turbocharged engines
- Durable construction for high-stress conditions
Maintenance and Service
This section provides guidance on maintaining and servicing the 4EAT transmission, including fluid requirements, common issues, and troubleshooting tips.
Maintenance and Service
This section provides guidance on maintaining and servicing the 4EAT transmission, including fluid requirements, common issues, and troubleshooting tips.
Fluid Specifications
- Recommended fluid: Subaru ATF-HP
- Fluid capacity: 9.5 quarts (including torque converter)
- Fluid change interval: Every 30,000-60,000 miles
- Use of incorrect fluid can cause damage
Common Issues
- Delayed or harsh shifting
- Transmission fluid leaks
- Torque converter failure
- TCM-related electrical issues
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed with electronic control
- Platform
- Subaru WRX 1992-2001
- Material
- Aluminum alloy casing
- Location
- Front-engine, all-wheel-drive layout
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
- 1.38 inches (35 mm)
- Fluid Capacity
- 9.5 quarts (9 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction materials
- Seals
- Nitrile rubber
- Sensors
- Stainless steel and plastic
Features
- Transmission Control
-
- Electronic shift control
- Adaptive shift logic
- Manual mode with paddle shifters (optional)
- Drivetrain Integration
-
- Full-time all-wheel drive
- Center differential with viscous coupling
- Torque split 45:55 front to rear
- Cooling
-
- Integrated transmission cooler
- External cooler compatibility
- Temperature monitoring system
- Performance
-
- Sport mode for aggressive shifting
- Lock-up torque converter
- Smooth shift transitions
- Durability
-
- Reinforced gear sets
- High-capacity clutch packs
- Sealed bearings for longevity
Safety Features
- Electronic Protections
-
- Overheat protection
- Over-rev prevention
- Fail-safe limp mode
- Mechanical Protections
-
- Shear pin in torque converter
- Reinforced casing for impact resistance
Comfort Features
- Shift Quality
-
- Smooth automatic shifts
- Reduced shift shock
- Quiet operation
- Driver Assistance
-
- Hill-hold assist
- Creep function for low-speed control
- Noise Reduction
-
- Sound-dampening casing
- Precision gear meshing
Accessories
- Performance Upgrades
-
- High-capacity transmission cooler
- Upgraded torque converter
- Performance shift kit
- Maintenance Tools
-
- Transmission fluid pump
- Diagnostic scan tool
- Seal replacement kit
- Replacement Parts
-
- Clutch pack set
- Solenoid kit
- Gasket and seal kit
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Transmission fluid and filter replacement
- Inspect clutch packs and bands
- Check solenoid operation
- Inspect seals for leaks
- Test electronic control unit
- Maintenance Notes
- Use only Subaru-approved transmission fluid for optimal performance.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Parts and labor for defects
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission components
- Corrosion
- Miles: UnlimitedYears: 5Coverage: Casing and external parts
- Extended
- Miles: 100,000Years: 7Coverage: Optional extended coverage for transmission
Production Details
- Manufacturer
- Subaru Corporation
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Laser alignment of components
- Quality Control
- Testing: Dyno testing for durability, Leak testing under pressure, Electronic calibrationStandards: ISO 9001 certified
- Sustainability
-
- Recyclable materials used
- Energy-efficient production
- Waste reduction initiatives
- Production Metrics
- Annual Output: 50,000 unitsDefect Rate: Less than 0.1%Lead Time: 4 weeks
Service Information for 4eat transmission Service
Maintenance and service requirements specific to this component
- Replace transmission fluid and filter
- Inspect clutch packs and bands
- Check solenoid operation
- Inspect seals for leaks
- Test electronic control unit
Use only Subaru-approved transmission fluid.
- Replace clutch packs if worn
- Inspect and clean transmission cooler
- Check torque converter operation
- Perform full diagnostic scan
Special tools required for clutch pack replacement.
- Overhaul transmission if necessary
- Replace all seals and gaskets
- Inspect and replace worn gears
- Test and recalibrate electronic controls
Major service may require removal of transmission.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4EAT transmission compatible with other Subaru models from 1992-2001?
Is the 4EAT transmission compatible with other Subaru models from 1992-2001?
The 4EAT transmission used in the 1992-2001 Subaru WRX is specifically designed for this model. While it may share similarities with transmissions in other Subaru vehicles, such as the Legacy or Impreza, compatibility is not guaranteed. Always verify part numbers and consult a Subaru service manual before attempting cross-model installations. Modifications may be required for non-WRX models.
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 to 60,000 miles, depending on driving conditions. Use only Subaru-approved ATF fluid. Inspect the transmission pan for leaks and clean the filter if applicable. Monitor for unusual noises or shifting issues, as these may indicate internal wear or fluid contamination. Proper maintenance ensures longevity and optimal performance.
Q3 How do I replace the 4EAT transmission in a 1992-2001 Subaru WRX?
How do I replace the 4EAT transmission in a 1992-2001 Subaru WRX?
Replacing the 4EAT transmission involves lifting the vehicle, disconnecting the battery, and removing the driveshaft, exhaust, and crossmember. Drain the transmission fluid and disconnect electrical connectors and shift linkage. Use a transmission jack to safely lower the old unit and install the new one. Reassemble components, refill with ATF, and test for proper operation. Professional assistance is recommended for this complex task.
Q4 What are common troubleshooting steps for 4EAT transmission issues?
What are common troubleshooting steps for 4EAT transmission issues?
Common issues include delayed shifting, slipping gears, or fluid leaks. Begin by checking the ATF level and condition. Inspect for damaged seals or gaskets. Use an OBD-II scanner to check for error codes related to the transmission control module. If problems persist, consult a professional for a detailed diagnostic, as internal components or the valve body may require attention.
Q5 How can I optimize the performance of the 4EAT transmission?
How can I optimize the performance of the 4EAT transmission?
To optimize performance, use high-quality ATF fluid and ensure proper fluid levels. Consider installing an aftermarket transmission cooler for improved heat dissipation. Regularly inspect and replace worn components like mounts and bushings. For enhanced shifting, a shift kit or upgraded valve body can be installed. Avoid aggressive driving habits to reduce wear and prolong transmission life.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1992-2001 Subaru WRX 4EAT Service Manual
Coming SoonComprehensive guide covering installation, maintenance, and repair procedures for the 4EAT transmission.
Subaru Technical Service Bulletin for 4EAT Transmission
Coming SoonOfficial updates and fixes for known issues related to the 4EAT transmission in 1992-2001 Subaru WRX models.
Subaru WRX 4EAT Parts and Accessories Catalog
Coming SoonDetailed catalog of OEM and aftermarket parts compatible with the 4EAT transmission.
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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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