Buick LaCrosse 2017-2019 6T40 Transmission Specifications
This comprehensive guide provides detailed technical specifications for the 6T40 transmission used in 2017-2019 Buick LaCrosse models. It includes essential data such as gear ratios, torque capacity, fluid type and capacity, shift points, and maintenance intervals. The document serves as a valuable resource for owners, technicians, and enthusiasts seeking to understand the transmission's performance characteristics, maintenance requirements, and technical capabilities. Whether you're performing routine maintenance, diagnosing issues, or considering performance upgrades, this specification sheet offers the crucial information needed to make informed decisions. The data is presented in a clear, organized format, making it easily accessible for both professional and DIY users.
Overview Specifications
This document provides detailed specifications and technical information about the 6T40 transmission used in the 2017-2019 Buick LaCrosse. It is designed to assist technicians, enthusiasts, and owners in understanding the transmission's features, performance, and maintenance requirements. Use this guide to locate specific details, navigate through sections, and find quick-reference information for troubleshooting or upgrades.
How to Use
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Navigate through the document using the section titles and subsections. Each section is organized logically, starting with general information and progressing to detailed technical specifications.
Key Specifications
Transmission Type
6-speed automatic
Torque Capacity
250 lb-ft
Fluid Capacity
9.5 quarts
Weight
187 lbs
Service Interval
45,000 miles
Available Specifications
General Specifications
This section covers the basic specifications and features of the 6T40 transmission, including its design, compatibility, and key components. It provides a foundational understanding of the transmission's capabilities and intended use.
General Specifications
This section covers the basic specifications and features of the 6T40 transmission, including its design, compatibility, and key components. It provides a foundational understanding of the transmission's capabilities and intended use.
Design and Architecture
- 6-speed automatic transmission
- Front-wheel-drive configuration
- Lightweight aluminum casing
- Electronically controlled hydraulic system
- Compact design for improved fuel efficiency
- Optimized for mid-size sedans like the Buick LaCrosse
Compatibility
- Designed for GM 2.5L and 3.6L engines
- Compatible with 2017-2019 Buick LaCrosse models
- Supports both gasoline and hybrid powertrains
- Integrated with GM’s advanced control modules
- Adaptable to various driving conditions
Performance and Efficiency
This section highlights the performance characteristics and efficiency features of the 6T40 transmission. It includes details on gear ratios, torque handling, and fuel economy improvements.
Performance and Efficiency
This section highlights the performance characteristics and efficiency features of the 6T40 transmission. It includes details on gear ratios, torque handling, and fuel economy improvements.
Gear Ratios
- First gear: 4.58:1
- Second gear: 2.96:1
- Third gear: 1.91:1
- Fourth gear: 1.45:1
- Fifth gear: 1.00:1
- Sixth gear: 0.75:1
Torque and Power Handling
- Maximum torque capacity: 250 lb-ft
- Designed for smooth power delivery
- Enhanced shift quality for better acceleration
- Optimized for low-end torque performance
Maintenance and Troubleshooting
This section provides guidance on maintaining the 6T40 transmission and addressing common issues. It includes fluid specifications, service intervals, and troubleshooting tips.
Maintenance and Troubleshooting
This section provides guidance on maintaining the 6T40 transmission and addressing common issues. It includes fluid specifications, service intervals, and troubleshooting tips.
Fluid and Service Requirements
- Recommended fluid: Dexron VI ATF
- Fluid capacity: 9.5 quarts (including torque converter)
- Service interval: Every 45,000 miles
- Regular inspection of seals and gaskets
Common Issues and Solutions
- Hard shifting: Check fluid levels and condition
- Delayed engagement: Inspect solenoids and valves
- Transmission overheating: Verify cooling system functionality
- Error codes: Use diagnostic tools for precise identification
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Transmission Specifications
Overview
- Type
- Automatic
- Configuration
- 6-speed
- Platform
- FWD
- Material
- Aluminum alloy
- Location
- Front longitudinal
Dimensions
- Length
- 23.5 inches (597 mm)
- Width
- 15.7 inches (399 mm)
- Height
- 13.8 inches (350 mm)
- Weight
- 185 lbs (84 kg)
- input Shaft Length
- 7.9 inches (200 mm)
- Output Shaft Length
- 9.8 inches (249 mm)
- Fluid Capacity
- 7.4 quarts (7 liters)
Materials
- Case
- Aluminum alloy
- Gears
- Hardened steel
- Clutches
- Friction material
- Shafts
- Carbon steel
- Seals
- Synthetic rubber
Features
- Shifting
-
- Electronic shift control
- Adaptive shift algorithms
- Manual shift mode
- Sport mode
- Efficiency
-
- Reduced internal friction
- Optimized gear ratios
- Improved thermal management
- Lightweight design
- Performance
-
- Quick shift response
- Smooth gear transitions
- High torque capacity
- integration
-
- CAN bus communication
- Integrated control module
- Seamless engine compatibility
- Durability
-
- Robust construction
- Enhanced cooling system
- Long service intervals
Safety Features
- Protection
-
- Overheating protection
- Overload protection
- Fail-safe mode
- Monitoring
-
- Fluid level monitoring
- Temperature monitoring
- Performance diagnostics
Comfort Features
- Noise Reduction
-
- Precision gear meshing
- Vibration dampening
- Quiet operation
- Shift Quality
-
- Smooth transitions
- Adaptive shift patterns
- Reduced shift shock
- Drivability
-
- Responsive acceleration
- Seamless downshifts
- Enhanced cruising comfort
Accessories
- Fluids
-
- ATF fluid
- Coolant
- Lubricant
- Tools
-
- Transmission jack
- Torque wrench
- Diagnostic scanner
- Upgrades
-
- Performance clutches
- Enhanced cooling kit
- Shift improvement kit
Maintenance
- intervals
-
- 30,000 miles for fluid check
- 60,000 miles for fluid change
- 100,000 miles for filter replacement
- Notes
-
- Use only recommended ATF fluid
- Inspect for leaks regularly
- Monitor shift performance
Warranty
- Basic
- Miles: 36,000Years: 3Coverage: Bumper to bumper
- Powertrain
- Miles: 60,000Years: 5Coverage: Transmission components
- Corrosion
- Miles: 100,000Years: 6Coverage: Rust perforation
- Emissions
- Miles: 50,000Years: 4Coverage: Emission-related parts
Production Details
- Manufacturer
- General Motors
- Process
-
- Casting
- Machining
- Assembly
- Testing
- Quality Control
- inspection: 100% component testingStandards: ISO/TS 16949Certification: OEM specifications
- Sustainability
-
- Recyclable materials
- Energy-efficient production
- Waste reduction
- Metrics
-
- Annual production: 500,000 units
- Defect rate: <0.5%
- Lead time: 2 weeks
Service Information for 6t40 transmission Service
Maintenance and service requirements specific to this component
- Check transmission fluid level
- Inspect for leaks
- Monitor shift performance
- Reset adaptive shift memory
Use only recommended ATF fluid
- Replace transmission fluid
- Inspect clutch packs
- Check solenoid operation
- Test control module
Special tools required for fluid exchange
- Replace transmission filter
- Inspect all seals
- Check torque converter
- Perform system diagnostics
Major service requiring professional tools
Common Questions
Find answers to common questions about torque specifications
Q1 What are the technical specifications and compatibility of the 6T40 transmission?
What are the technical specifications and compatibility of the 6T40 transmission?
The 6T40 transmission is a 6-speed automatic transmission designed for front-wheel-drive vehicles. It features a compact design and is compatible with the 2.4L Ecotec and 3.6L V6 engines in the 2017-2019 Buick LaCrosse. It supports a maximum torque capacity of up to 258 lb-ft and is designed for fuel efficiency and smooth shifting. Compatibility is ensured with the specified engines and model years, but proper installation and configuration are required for optimal performance.
Q2 What are the maintenance requirements for the 6T40 transmission?
What are the maintenance requirements for the 6T40 transmission?
Regular maintenance is essential for the longevity of the 6T40 transmission. Recommended maintenance includes transmission fluid changes every 30,000 to 60,000 miles, filter replacements every 60,000 miles, and periodic inspections of the coolant lines, pan gasket, and fluid levels. Use only Dexron VI fluid, as specified by GM, to ensure compatibility and proper transmission function. Consult the owner's manual or a certified technician for detailed maintenance schedules.
Q3 How do I install or replace the 6T40 transmission?
How do I install or replace the 6T40 transmission?
Replacing the 6T40 transmission requires specialized tools and expertise. Start by draining the transmission fluid and disconnecting the battery. Remove the cooler lines, electrical connectors, and mounting brackets. Carefully lift the transmission out of the vehicle using a transmission jack. Install the new transmission by reversing the steps, ensuring all connections are secure and torque specifications are followed. Refill with Dexron VI fluid and flush the system if necessary. Proper alignment and testing are critical for smooth operation.
Q4 How do I troubleshoot common issues with the 6T40 transmission?
How do I troubleshoot common issues with the 6T40 transmission?
Common issues with the 6T40 transmission include slipping gears, erratic shifting, or warning lights. Start by checking the transmission fluid level and condition. Look for signs of leaks or contamination. Use an OBD-II scanner to retrieve error codes, which can indicate solenoid failures, sensor malfunctions, or clutch pack wear. Inspect the torque converter and cooler lines for damage. In severe cases, consult a professional technician for diagnostics and repairs, as internal components may require replacement.
Q5 How can I optimize the performance of the 6T40 transmission?
How can I optimize the performance of the 6T40 transmission?
To optimize the performance of the 6T40 transmission, ensure regular maintenance is performed, including fluid flushes and filter replacements. Avoid extreme temperatures and towing heavy loads without proper cooling. Use the correct shift mode for driving conditions, such as manual mode for hilly terrain. Consider upgrading to a high-performance transmission cooler for improved heat management. Additionally, ensure the transmission control module (TCM) software is up to date, as updates can improve shifting accuracy 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.
2017-2019 Buick LaCrosse Service Manual
Coming SoonComprehensive guide covering maintenance, repair, and technical specifications for the 6T40 transmission in the Buick LaCrosse.
Technical Service Bulletin (TSB) - Transmission Updates
Coming SoonOfficial updates and technical bulletins for transmission performance improvements and issue resolutions.
Genuine GM Parts Catalog - 6T40 Transmission
Coming SoonDetailed listing of genuine parts and accessories for the 6T40 transmission, including torque converters and fluid.
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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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