Buick LaCrosse 2005-2009 4T65 Transmission Specifications
This document provides detailed specifications for the 4T65-E transmission used in the 2005-2009 Buick LaCrosse. It includes critical information such as gear ratios, fluid capacity, torque converter specifications, and shift points. These specifications are essential for mechanics, enthusiasts, and owners looking to understand the transmission's performance, maintenance requirements, and compatibility with replacement parts. The data is sourced from official service manuals and verified for accuracy, making it a reliable resource for troubleshooting, repairs, and upgrades. Whether you're performing routine maintenance or planning modifications, this guide offers valuable insights to ensure optimal transmission performance and longevity.
Overview Specifications
This document provides detailed specifications and technical information about the 4T65-E transmission used in the 2005-2009 Buick LaCrosse. It is designed to assist technicians, enthusiasts, and owners in understanding the transmission's features, maintenance, and performance. Each section is organized to provide clear and concise information, making it easy to locate specific details. Use the search and navigation instructions to quickly find the information you need.
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Key Specifications
Transmission Type
4T65-E
Gear Count
4-speed
Torque Capacity
380 Nm
Fluid Capacity
7.4 liters
Service Interval
50,000 miles
Available Specifications
Transmission Design
The 4T65-E transmission is a four-speed automatic transmission designed for front-wheel-drive vehicles. This section covers its basic design, components, and how it integrates with the Buick LaCrosse's powertrain.
Transmission Design
The 4T65-E transmission is a four-speed automatic transmission designed for front-wheel-drive vehicles. This section covers its basic design, components, and how it integrates with the Buick LaCrosse's powertrain.
General Design Features
- Four-speed automatic transmission
- Front-wheel-drive configuration
- Hydraulic control system
- Electronically controlled shifting
- Designed for V6 engines
- Compact and lightweight design
Key Components
- Torque converter with lock-up clutch
- Planetary gear sets
- Hydraulic pump
- Valve body for fluid control
- Electronic pressure control solenoid
- Input and output speed sensors
Performance Specifications
This section provides detailed performance metrics for the 4T65-E transmission, including gear ratios, torque capacity, and operational limits.
Performance Specifications
This section provides detailed performance metrics for the 4T65-E transmission, including gear ratios, torque capacity, and operational limits.
Gear Ratios
- First gear: 2.92:1
- Second gear: 1.57:1
- Third gear: 1.00:1
- Fourth gear: 0.70:1
- Reverse gear: 2.38:1
- Final drive ratio: 3.05:1
Torque and Power Handling
- Maximum torque capacity: 380 Nm (280 lb-ft)
- Designed for engines up to 3.6L
- Smooth power delivery for comfort
- Optimized for fuel efficiency
- Durable construction for long-term reliability
- Compatible with GM's VVT technology
Maintenance and Service
Proper maintenance is essential for the longevity and performance of the 4T65-E transmission. This section outlines common maintenance tasks, service intervals, and troubleshooting tips.
Maintenance and Service
Proper maintenance is essential for the longevity and performance of the 4T65-E transmission. This section outlines common maintenance tasks, service intervals, and troubleshooting tips.
Routine Maintenance
- Check and replace transmission fluid every 50,000 miles
- Inspect for leaks regularly
- Monitor transmission temperature
- Replace filter during fluid changes
- Use only recommended ATF
- Reset adaptive learning after service
Troubleshooting Common Issues
- Slipping gears: Check fluid level and condition
- Delayed engagement: Inspect solenoid and valve body
- Erratic shifting: Examine sensors and wiring
- Overheating: Verify cooling system operation
- Noise during operation: Inspect torque converter
- Check for error codes using a diagnostic tool
Search Specifications
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 4-speed
- Platform
- GM W platform
- Material
- Aluminum casing
- Location
- Front-wheel drive
Dimensions
- Length
- 22.5 inches (571.5 mm)
- Width
- 15.3 inches (388.6 mm)
- Height
- 11.2 inches (284.5 mm)
- Weight
- 156 lbs (70.8 kg)
- input Shaft Diameter
- 0.98 inches (25 mm)
- Output Shaft Diameter
- 1.18 inches (30 mm)
- Fluid Capacity
- 7.4 quarts (7 liters)
Materials
- Casing
- Aluminum alloy
- Gears
- Hardened steel
- Clutch Packs
- Composite friction material
- Seals
- Synthetic rubber
Features
- Transmission Control
-
- Electronic shift control
- Adaptive shift scheduling
- Torque converter clutch control
- Performance
-
- Wide gear ratio spread
- Smooth shift quality
- Enhanced durability
- Efficiency
-
- Reduced internal friction
- Optimized fluid flow
- Improved thermal management
- integration
-
- Compatible with GM PCM
- Integrated pressure switches
- Sealed electrical connectors
Safety Features
- Fail Safes
-
- Limp-home mode
- Overheat protection
- Monitoring
-
- Transmission fluid temperature sensor
- Gear position sensor
Comfort Features
- Shift Quality
-
- Smooth upshifts
- Minimal shift shock
- Noise Reduction
-
- Precision gear machining
- Sound-dampening materials
Accessories
- Cooling
-
- Transmission cooler lines
- Auxiliary cooler options
- Mounting
-
- Transmission mount
- Crossmember
- Electrical
-
- Wiring harness
- Solenoid pack
Maintenance
- Service interval
- Every 30,000 miles (48,280 km) or 24 months
- Service Items
-
- Transmission fluid change
- Filter replacement
- Pan gasket inspection
- Seal inspection
- Shift solenoid check
- Maintenance Notes
- Use only Dexron VI transmission fluid
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Bumper-to-bumper
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission components
- Corrosion
- Miles: 100,000Years: 6Coverage: Perforation only
- Emissions
- Miles: 80,000Years: 8Coverage: Federal emissions components
Production Details
- Manufacturer
- General Motors
- Manufacturing Process
-
- Precision casting
- CNC machining
- Automated assembly
- Quality Control
- Testing: Dyno testing, Pressure testing, Leak testingStandards: ISO 9001
- Sustainability Practices
-
- Recycled aluminum usage
- Waste reduction initiatives
- Production Metrics
- Units Per Day: 500Defect Rate: 0.5%
Service Information for 4t65 transmission Service
Maintenance and service requirements specific to this component
- Inspect transmission fluid level
- Check for leaks
- Inspect transmission mount
- Inspect cooler lines
- Test shift quality
Replace transmission fluid if discolored or burnt
- Replace transmission fluid
- Replace filter
- Inspect pan gasket
- Check shift solenoids
- Test torque converter clutch
Use only manufacturer-recommended fluids
- Complete transmission flush
- Inspect internal components
- Replace worn seals
- Test pressure switches
- Check valve body operation
Major service may require transmission removal
Common Questions
Find answers to common questions about torque specifications
Q1 What are the technical specifications of the 4T65-E transmission in the 2005-2009 Buick LaCrosse?
What are the technical specifications of the 4T65-E transmission in the 2005-2009 Buick LaCrosse?
The 4T65-E is a 4-speed automatic transmission designed for longitudinal engine applications. It features electronic controls, a torque converter clutch, and a gear ratio spread of 2.87 (1st), 1.84 (2nd), 1.41 (3rd), and 1.00 (4th). It is compatible with the 3.8L V6 engine in the Buick LaCrosse, with a maximum torque capacity of approximately 260 lb-ft. The transmission uses Dexron VI ATF and has a fluid capacity of around 10 quarts.
Q2 What maintenance is required for the 4T65-E transmission?
What maintenance is required for the 4T65-E transmission?
Regular maintenance for the 4T65-E includes fluid checks every 15,000 miles and complete fluid changes every 30,000 to 60,000 miles. The transmission filter should be replaced every 30,000 miles. Inspections of the pan gasket, cooler lines, and electrical connections are recommended during service intervals. Always use Dexron VI ATF to ensure compatibility and optimal performance.
Q3 How do I replace the 4T65-E transmission in my Buick LaCrosse?
How do I replace the 4T65-E transmission in my Buick LaCrosse?
Replacing the 4T65-E transmission requires specialized tools and mechanical expertise. Start by lifting the vehicle and draining the transmission fluid. Disconnect the battery, coolers, and electrical connectors. Remove the driveshaft, crossmember, and transmission mounts. Carefully pull the transmission straight back from the engine, ensuring the torque converter is properly aligned. Installation is the reverse process, ensuring all connections are secure and the transmission is refilled with Dexron VI ATF. It is highly recommended to consult a professional mechanic or the service manual for precise instructions.
Q4 What are common issues with the 4T65-E transmission and how can I troubleshoot them?
What are common issues with the 4T65-E transmission and how can I troubleshoot them?
Common issues with the 4T65-E include slipping between gears, erratic shifting, and transmission overheating. These symptoms can be caused by low fluid levels, dirty fluid, or failing solenoids. Check the fluid level and condition, inspect for leaks, and scan for trouble codes using an OBD-II scanner. If issues persist, consult a transmission specialist or refer to the service manual for diagnostic procedures.
Q5 How can I optimize the performance of my 4T65-E transmission?
How can I optimize the performance of my 4T65-E transmission?
To optimize performance, ensure regular maintenance is performed, including fluid changes and filter replacements. Avoid extreme temperatures and heavy towing without proper cooling. Shift firmly and avoid rapid acceleration or deceleration. Consider upgrading to a heavy-duty transmission cooler if you drive in harsh conditions or tow frequently. Always use Dexron VI ATF for optimal lubrication and thermal stability.
Factory Service Resources
Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.
Buick LaCrosse 4T65-E Transmission Service Manual
Coming SoonA comprehensive guide covering technical specifications, maintenance procedures, and diagnostic information for the 4T65-E transmission.
Technical Service Bulletin (TSB) for 4T65-E Updates
Coming SoonOfficial updates and technical bulletins from General Motors regarding the 4T65-E transmission, including software updates and service procedures.
4T65-E Transmission Parts Catalog
Coming SoonA detailed catalog of parts and accessories compatible with the 4T65-E transmission, including filters, gaskets, and seals.
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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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