Pontiac Pontiac Sunfire 1995-2005 4T45 Transmission Specifications
This document provides detailed specifications for the 4T45 transmission used in the 1995-2005 Pontiac Sunfire. It includes information on gear ratios, fluid capacities, torque converter specifications, and maintenance intervals. These specifications are essential for understanding the transmission's performance, ensuring proper maintenance, and diagnosing potential issues. Whether you're a mechanic, enthusiast, or owner, this guide offers valuable insights into the transmission's design and operational parameters. By following these specifications, you can enhance the longevity and reliability of your Pontiac Sunfire's transmission, making it a crucial resource for anyone involved in its care or repair.
Overview Specifications
This document provides detailed specifications and technical information about the 4T45 transmission used in Pontiac Sunfire models from 1995 to 2005. It includes sections on design, performance, maintenance, and troubleshooting. Use this guide to understand the transmission's features, identify potential issues, and perform necessary repairs. The search and navigation instructions will help you quickly locate the information you need.
How to Use
Use the search function by entering keywords related to the 4T45 transmission. This will help you find specific details, such as torque specifications or fluid types, quickly and efficiently.
Navigate through the document by clicking on the section titles in the table of contents. Each section is organized into subsections for easy access to detailed information.
Key Specifications
Transmission Type
4-speed automatic
Torque Capacity
240 lb-ft
Fluid Capacity
7.4 quarts
Weight
150 lbs
Shift Response
Adaptive control
Available Specifications
Design and Construction
This section covers the design and construction of the 4T45 transmission, including its key components and materials. Learn about the transmission's architecture and how it integrates with the Pontiac Sunfire's drivetrain.
Design and Construction
This section covers the design and construction of the 4T45 transmission, including its key components and materials. Learn about the transmission's architecture and how it integrates with the Pontiac Sunfire's drivetrain.
Transmission Components
- Four-speed automatic transmission
- Torque converter with lock-up clutch
- Planetary gear sets
- Hydraulic control system
- Electronically controlled solenoid valves
- Integrated overdrive
Materials and Build
- Aluminum alloy housing for reduced weight
- High-strength steel gears
- Composite clutch plates
- Sealed bearings for durability
- Corrosion-resistant coatings
Performance Specifications
This section provides detailed performance metrics for the 4T45 transmission, including torque capacity, shift patterns, and efficiency. Understand how the transmission enhances the Pontiac Sunfire's driving experience.
Performance Specifications
This section provides detailed performance metrics for the 4T45 transmission, including torque capacity, shift patterns, and efficiency. Understand how the transmission enhances the Pontiac Sunfire's driving experience.
Torque and Power Handling
- Maximum torque capacity: 240 lb-ft
- Engine compatibility: 2.2L and 2.4L engines
- Smooth power delivery
- Optimized for fuel efficiency
Shift Patterns and Response
- Adaptive shift control
- Quick and precise gear changes
- Sport mode for enhanced performance
- Reduced shift shock
Maintenance and Care
This section outlines best practices for maintaining the 4T45 transmission, including fluid changes, inspections, and common issues to watch for. Ensure your transmission remains in optimal condition with these guidelines.
Maintenance and Care
This section outlines best practices for maintaining the 4T45 transmission, including fluid changes, inspections, and common issues to watch for. Ensure your transmission remains in optimal condition with these guidelines.
Fluid Requirements
- Recommended fluid: Dexron VI ATF
- Fluid capacity: 7.4 quarts
- Regular fluid changes every 50,000 miles
- Check for fluid leaks regularly
Inspection and Troubleshooting
- Monitor for unusual noises or vibrations
- Check for error codes using OBD-II scanner
- Inspect transmission mounts
- Address slipping or delayed shifts promptly
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Transmission Specifications
Overview
- Type
- Automatic Front-Wheel Drive Transmission
- Configuration
- 4-speed overdrive
- Platform
- GM J-body platform
- Material
- Aluminum and steel composite
- Location
- Transverse-mounted
Dimensions
- Length
- 22.5 inches (571.5 mm)
- Width
- 17.8 inches (452.1 mm)
- Height
- 13.2 inches (335.3 mm)
- Weight
- 135 lbs (61.2 kg)
- input Shaft Length
- 6.3 inches (160 mm)
- Output Shaft Length
- 7.1 inches (180 mm)
- Fluid Capacity
- 7.4 quarts (7 liters)
Materials
- Housing
- Aluminum alloy
- Gears
- Case-hardened steel
- Clutch Plates
- Composite friction material
- Seals
- Nitrile rubber
Features
- Performance
-
- Electronic shift control
- Adaptive shift programming
- Torque converter lockup
- Efficiency
-
- Overdrive gear for fuel economy
- Reduced internal friction
- Optimized gear ratios
- Durability
-
- Hardened steel gears
- Enhanced cooling system
- Robust clutch design
- Control
-
- PCM-controlled shifting
- Manual shift capability
- Grade braking assist
- Safety
-
- Fail-safe limp mode
- Overheat protection
- Shift interlock system
Safety Features
- Protection
-
- Overheat shutdown
- Low fluid detection
- Fail-Safe
-
- Limp mode activation
- Monitoring
-
- Transmission fluid temperature sensor
- Shift position sensor
Comfort Features
- Smoothness
-
- Soft shift programming
- Torque converter damping
- Noise Reduction
-
- Precision gear machining
- Sound-insulating housing
- Convenience
-
- Automatic shift logic
- Manual override mode
Accessories
- installation
-
- Transmission mount kit
- Torque converter alignment tool
- Fluid pump
- Maintenance
-
- Transmission fluid filter
- Seal kit
- Gasket set
- Upgrades
-
- Performance shift kit
- High-capacity cooler
- Synthetic transmission fluid
Maintenance
- Service interval
- Every 30,000 miles or 24 months
- Service Items
-
- Fluid and filter replacement
- Seal inspection
- Shift linkage adjustment
- Torque converter check
- Sensor calibration
- Notes
- Use only Dexron III or equivalent fluid.
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Defects in materials and workmanship
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission components
- Corrosion
- Miles: 100,000Years: 6Coverage: Perforation due to rust
- Emissions
- Miles: 50,000Years: 4Coverage: Emissions-related components
- Terms
- Warranty void if improper maintenance or modifications are performed.
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Precision CNC machining
- Automated assembly
- Quality testing
- Quality Control
- inspection: 100% component testingTolerance: Within 0.001 inches
- Sustainability
-
- Recyclable materials
- Low-emission manufacturing
- Energy-efficient processes
- Production Metrics
- Units Per Year: 500,000Defect Rate: Less than 0.1%
Service Information for 4t45 transmission Service
Maintenance and service requirements specific to this component
- Replace transmission fluid and filter
- Inspect seals and gaskets
- Check shift linkage
- Test torque converter
- Calibrate sensors
Use Dexron III or equivalent fluid.
- Inspect clutch plates
- Check fluid cooling system
- Test electronic shift control
- Verify gear engagement
Perform pressure tests if irregularities are detected.
- Overhaul transmission internals
- Replace worn gears and bearings
- Inspect and clean valve body
- Test overall performance
Major service requires specialized tools and expertise.
Common Questions
Find answers to common questions about torque specifications
Q1 Is the 4T45 transmission compatible with other Pontiac models?
Is the 4T45 transmission compatible with other Pontiac models?
The 4T45 transmission was primarily designed for the 1995-2005 Pontiac Sunfire. While it shares some similarities with transmissions in other GM models, direct compatibility is not guaranteed. Always verify the specific model and year before attempting installation. Cross-referencing part numbers and consulting technical manuals is recommended to ensure compatibility.
Q2 What are the maintenance requirements for the 4T45 transmission?
What are the maintenance requirements for the 4T45 transmission?
Regular maintenance is crucial for optimal performance. It is recommended to check and replace the transmission fluid every 30,000 to 50,000 miles. Inspect the filter and gasket during fluid changes. Monitor for leaks, unusual noises, or shifting issues. Periodic inspections of the torque converter and solenoids can also help prevent major failures.
Q3 How do I replace the 4T45 transmission in a Pontiac Sunfire?
How do I replace the 4T45 transmission in a Pontiac Sunfire?
To replace the 4T45 transmission, first, disconnect the battery and drain the transmission fluid. Remove the driveshaft, exhaust components, and transmission mounts. Disconnect the wiring harness and shift linkage. Use a transmission jack to support and lower the old transmission. Install the new transmission in reverse order, ensuring proper alignment and torque specifications.
Q4 What are common troubleshooting steps for 4T45 transmission issues?
What are common troubleshooting steps for 4T45 transmission issues?
Common issues include slipping gears, delayed shifts, or transmission fluid leaks. Start by checking the fluid level and condition. Inspect for leaks around the pan and seals. Scan for diagnostic trouble codes using an OBD-II scanner. Test the solenoids and sensors for proper operation. If problems persist, consult a professional technician for further diagnosis.
Q5 How can I optimize the performance of my 4T45 transmission?
How can I optimize the performance of my 4T45 transmission?
To optimize performance, use high-quality transmission fluid and replace it regularly. Ensure the transmission is properly tuned and the throttle position sensor is calibrated. Upgrade to a performance torque converter for better acceleration. Avoid excessive load and overheating by driving within recommended limits. Regular inspections and maintenance are key to longevity.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
1995-2005 Pontiac Sunfire Service Manual
Coming SoonThis manual provides detailed instructions for servicing and repairing the Pontiac Sunfire, including the 4T45 transmission. It covers diagnostics, maintenance, and replacement procedures.
4T45 Transmission Technical Service Bulletin
Coming SoonThis bulletin addresses common issues and updates related to the 4T45 transmission. It includes solutions for known problems and recommended repair procedures.
Pontiac Sunfire Parts and Accessories Guide
Coming SoonThis guide lists compatible parts and accessories for the Pontiac Sunfire, including transmission components. It helps identify the correct parts for replacement or upgrade.
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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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