Cadillac DeVille 1994-1999 4T80 Transmission Specifications
This comprehensive guide provides detailed technical specifications for the 4T80-E automatic transmission used in 1994-1999 Cadillac DeVille models. It includes vital information on gear ratios, torque converter specifications, fluid capacities, and shift patterns. Designed for automotive technicians, enthusiasts, and DIY mechanics, this resource covers essential maintenance intervals, common issues, and performance characteristics. The specifications serve as a valuable reference for troubleshooting, repairs, and upgrades, ensuring proper transmission operation and longevity. Whether you're performing routine maintenance or diagnosing transmission problems, this guide offers the technical details needed to work effectively with the 4T80-E transmission system in fourth-generation Cadillac DeVille vehicles.
4T80-E Transmission Specifications Specifications
This document provides comprehensive technical specifications and operational details for the 4T80-E automatic transmission used in 1994-1999 Cadillac DeVille models. The information is organized into sections covering design features, performance characteristics, maintenance requirements, and troubleshooting tips. Use this guide to understand the transmission's capabilities, maintain optimal performance, and address common issues.
How to Use
Use the search function to quickly locate specific information by entering keywords such as 'torque converter' or 'shift points'. This feature is especially useful for finding detailed technical data or troubleshooting steps.
Navigate through the document by clicking on section titles in the table of contents. Each section is organized into subsections with detailed points for easy reference. Use the quick reference table for key specifications at a glance.
Key Specifications
Transmission Type
4-speed automatic with overdrive
Maximum Torque
440 lb-ft
Weight
220 lbs
Fluid Capacity
12.7 quarts
Gear Ratios
1st: 2.92, 2nd: 1.57, 3rd: 1.00, 4th: 0.70
Available Specifications
Design Features
This section outlines the key design elements of the 4T80-E transmission, including its construction, components, and technological innovations. Understanding these features helps in appreciating the transmission's reliability and performance.
Design Features
This section outlines the key design elements of the 4T80-E transmission, including its construction, components, and technological innovations. Understanding these features helps in appreciating the transmission's reliability and performance.
Construction and Materials
- Aluminum alloy casing for reduced weight
- Heavy-duty steel gears for durability
- Advanced sealing technology to prevent leaks
- High-capacity oil pump for efficient lubrication
Technological Innovations
- Electronic control module (ECM) for precise shifting
- Torque converter with lockup clutch for improved fuel efficiency
- Four-speed automatic with overdrive
- Adaptive shift scheduling for varying driving conditions
Performance Characteristics
This section details the performance metrics of the 4T80-E transmission, including its shift points, torque handling, and fuel efficiency. These characteristics are crucial for understanding the transmission's capabilities and limitations.
Performance Characteristics
This section details the performance metrics of the 4T80-E transmission, including its shift points, torque handling, and fuel efficiency. These characteristics are crucial for understanding the transmission's capabilities and limitations.
Shift Points and Smoothness
- Smooth, precise shifts at optimal RPMs
- Adaptive shift scheduling for varying loads
- Quick response to throttle inputs
- Minimal shift shock for passenger comfort
Torque Handling and Durability
- Rated for up to 440 lb-ft of torque
- Heavy-duty clutch packs for high torque applications
- Robust planetary gear sets for long-term reliability
- Designed for high-performance and luxury vehicles
Maintenance and Service
This section provides guidelines for maintaining and servicing the 4T80-E transmission to ensure long-term reliability and performance. Regular maintenance is essential for preventing common issues and extending the transmission's lifespan.
Maintenance and Service
This section provides guidelines for maintaining and servicing the 4T80-E transmission to ensure long-term reliability and performance. Regular maintenance is essential for preventing common issues and extending the transmission's lifespan.
Routine Maintenance
- Regular fluid changes every 30,000 miles
- Inspect and replace transmission filter as needed
- Check for leaks and seal integrity
- Monitor fluid levels and condition regularly
Common Service Issues
- Address delayed or harsh shifting promptly
- Inspect and replace worn clutch packs
- Check for ECM fault codes regularly
- Replace torque converter if slippage occurs
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed longitudinal
- Platform
- GM FWD large car platform
- Material
- Aluminum casing
- Location
- Front-wheel drive
Dimensions
- Length
- 27.5 inches (698.5 mm)
- Width
- 17.2 inches (436.9 mm)
- Height
- 12.8 inches (325.1 mm)
- Weight
- 187 lbs (84.8 kg)
- input Shaft Length
- 7.3 inches (185.4 mm)
- Output Shaft Length
- 9.1 inches (231.1 mm)
- Fluid Capacity
- 12.7 quarts (12 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction materials
- Seals
- Viton rubber
- Cooler Lines
- Steel with rubber insulation
Features
- Performance
-
- Adaptive shift control
- Electronic pressure control
- Torque converter lockup
- Grade braking
- Controls
-
- PRNDL gear selection
- Overdrive disable button
- Shift solenoid control
- Transmission control module (TCM)
- Cooling
-
- Integrated fluid cooler
- External cooler lines
- Thermostatically controlled flow
- Durability
-
- Reinforced gear sets
- High-capacity clutches
- Sealed bearings
- Hardened input shaft
- Sensors
-
- Speed sensors
- Temperature sensors
- Pressure sensors
- Position sensors
Safety Features
- Emergency
-
- Fail-safe limp mode
- Manual shift override
- Protection
-
- Over-temperature protection
- Over-pressure relief
- Monitoring
-
- Real-time diagnostics
- Shift quality monitoring
Comfort Features
- Smoothness
-
- Adaptive shift patterns
- Torque converter damping
- Noise
-
- Isolated mounting
- Helical gear teeth
- Convenience
-
- Automatic park lock
- Shift indicator lights
- Drive Modes
-
- Normal mode
- Performance mode
Accessories
- External
-
- Transmission cooler
- Mounting brackets
- Shift linkage
- internal
-
- Filter kit
- Gasket set
- Seal kit
- Electronic
-
- TCM module
- Wiring harness
- Sensors
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Fluid and filter change
- Sensor inspection
- Seal inspection
- Shift quality check
- Mount inspection
- Maintenance Notes
- Use only Dexron III transmission fluid
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Bumper-to-bumper
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission and drivetrain
- Corrosion
- Miles: 100,000Years: 7Coverage: Perforation only
- Emissions
- Miles: 50,000Years: 4Coverage: Emission control components
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Casting
- Machining
- Assembly
- Testing
- Quality Control
- inspection: 100% component inspectionTesting: Durability and shift quality testing
- Sustainability Practices
-
- Recycled aluminum use
- Waste reduction program
- Energy-efficient manufacturing
- Production Metrics
- Units Per Year: 150,000Defect Rate: <0.5%Lead Time: 6 weeks
Service Information for 4t80 transmission Service
Maintenance and service requirements specific to this component
- Replace transmission fluid
- Replace filter
- Inspect seals and gaskets
- Check shift quality
- Inspect cooler lines
Use only Dexron III transmission fluid
- Full fluid flush
- Replace all seals
- Inspect torque converter
- Check TCM operation
- Test pressure sensors
Requires specialized diagnostic equipment
- Complete overhaul
- Replace clutch packs
- Rebuild valve body
- Replace all bearings
- Re-calibrate TCM
Recommended for maintaining optimal performance
Common Questions
Find answers to common questions about torque specifications
Q1 What are the technical specifications of the 4T80 transmission in a 1994-1999 Cadillac DeVille?
What are the technical specifications of the 4T80 transmission in a 1994-1999 Cadillac DeVille?
The 4T80 is a 4-speed automatic transmission designed for longitudinal engine applications. It features an overdrive gear, a torque converter with lockup capability, and electronic controls. It is compatible with the Cadillac DeVille's 4.9L and 4.6L Northstar engines. The transmission is equipped with adaptive shift controls and a wide gear ratio spread for optimal performance and fuel efficiency.
Q2 What are the maintenance requirements for the 4T80 transmission?
What are the maintenance requirements for the 4T80 transmission?
Regular maintenance for the 4T80 includes checking the transmission fluid level and condition every 5,000 miles. The fluid should be changed every 30,000 miles, along with the filter. Inspect the transmission pan gasket for leaks and replace if necessary. The cooler lines and connections should also be checked for damage or corrosion. Always use GM-approved Dexron III fluid for optimal performance.
Q3 How do I install or replace the 4T80 transmission?
How do I install or replace the 4T80 transmission?
Replacing the 4T80 requires lifting the vehicle and removing the old transmission. Disconnect the electrical connectors, coolant lines, and shift linkage. Remove the transmission mounts and crossmember, then carefully lower the transmission. Install the new transmission by reversing the steps, ensuring all connections are secure. Refill with Dexron III fluid and bleed the system to remove air. Proper alignment and torque specifications must be followed.
Q4 How do I troubleshoot common issues with the 4T80 transmission?
How do I troubleshoot common issues with the 4T80 transmission?
Common issues include slipping or harsh shifts. Check the transmission fluid level and condition, as low or dirty fluid can cause problems. Inspect the solenoid pack and wiring harness for damage or corrosion. Use a scan tool to check for trouble codes, which can indicate specific faults. If issues persist, a professional transmission specialist should be consulted.
Q5 How can I optimize the performance of the 4T80 transmission?
How can I optimize the performance of the 4T80 transmission?
Optimal performance can be achieved by maintaining proper fluid levels and condition, avoiding extreme temperatures, and driving in a manner that avoids excessive strain. Regular maintenance, such as filter changes and fluid flushes, can also improve longevity. Upgrading to high-performance transmission components, such as a heavy-duty torque converter, can enhance towing capacity and acceleration.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
4T80 Transmission Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and troubleshooting procedures for the 4T80 transmission.
Technical Bulletin: 4T80 Transmission Updates
Coming SoonOfficial updates and technical bulletins for the 4T80 transmission, including improvements and modifications.
4T80 Transmission Parts Catalog
Coming SoonDetailed list of genuine and aftermarket parts for the 4T80 transmission, including diagrams and part numbers.
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Important information about using this content
Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.
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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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