Cadillac XTS 2013-2019 6T70 Transmission Torque Specifications
Comprehensive guide to bolt torque specifications for the 6T70 automatic transmission used in the 2013-2019 Cadillac XTS, including case bolts, valve body bolts, and other relevant fasteners.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
Always use a calibrated torque wrench and follow specifications exactly.
Incorrect Torque Sequence
Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
Clean and inspect all threads before assembly. Use new thread locker if specified.
Reusing TTY Bolts
Torque-to-yield bolts are designed to stretch and must not be reused.
Always replace TTY bolts with new ones. They are single-use only.
Dry vs. Lubricated
Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
Torque Wrench Care
- Calibrate annually or after 5,000 clicks
- Store at lowest setting
- Keep clean and lubricated
Search Specifications
Search by component name, bolt size, or description
Torque Calculator
Convert between different torque units
Transmission Mounting
These specifications cover the bolts that secure the 6T70 transmission to the engine block and/or transmission mount.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
Transmission Case
These specifications cover components mounted directly to the transmission case.
1 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
2 Transmission Valve Body Bolts
M6 x 1.0
Transmission Valve Body Bolts
M6 x 1.0Torque Value
Important Notes
3 Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0
Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0Torque Value
Important Notes
4 Transmission Range Sensor (TRS) Bolts
M6 x 1.0
Transmission Range Sensor (TRS) Bolts
M6 x 1.0Torque Value
Important Notes
5 Output Shaft Retainer Bolts/Nuts
M8 x 1.25
Output Shaft Retainer Bolts/Nuts
M8 x 1.25Torque Value
Important Notes
Fluid Management
These specifications cover components used for transmission fluid handling.
1 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
Driveline
These specifications cover components related to the driveline connected to the transmission.
1 Drive Axle/Half Shaft Bolts
M10 x 1.5
Drive Axle/Half Shaft Bolts
M10 x 1.5Torque Value
Important Notes
2 CV Joint/Axle Nut
M24 x 1.5
CV Joint/Axle Nut
M24 x 1.5Torque Value
Important Notes
3 Torque Converter Bolts
M10 x 1.25
Torque Converter Bolts
M10 x 1.25Torque Value
Important Notes
Bellhousing
These specifications are for the bellhousing to engine block bolts, if the transmission uses a separate bellhousing.
1 Bellhousing Bolts to Engine Block
M12 x 1.75
Bellhousing Bolts to Engine Block
M12 x 1.75Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
Loose Components
Symptoms:
- Rattling or vibration noises
- Visible movement in components
- Uneven panel gaps
Solutions:
- Clean threads and mounting surfaces
- Replace damaged fasteners
- Apply proper torque in sequence
- Use thread locker if specified
Stripped Fasteners
Symptoms:
- Unable to achieve proper torque
- Fastener spins freely
- Visible thread damage
Solutions:
- Use thread repair kit if appropriate
- Install thread insert (HeliCoil)
- Replace component if threaded hole is damaged
- Upgrade to higher grade fastener if recommended
Overtightened Components
Symptoms:
- Cracked or deformed parts
- Broken fasteners
- Compressed gaskets or seals
Solutions:
- Replace damaged components
- Use new fasteners
- Follow proper torque sequence
- Verify correct torque specifications
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Diagnostic Steps
Visual inspection, torque verification, thread assessment
Visual Inspection
Inspect the affected area for any visible signs of damage or wear
- Check for cracks or deformation
- Look for signs of excessive wear
- Verify proper fastener installation
Torque Verification
Verify the torque applied to the fasteners
- Check the torque wrench calibration
- Verify the torque specification
- Compare the applied torque to the specification
Thread Assessment
Assess the condition of the threads
- Check for signs of thread damage
- Verify the thread type and size
- Check for proper thread engagement
Prevention Guidelines
Best practices, maintenance tips, tool care
Prevention Guidelines
Best practices, maintenance tips, tool care
Best Practices
- Always follow the recommended torque specification
- Use the correct type and size of fasteners
- Verify the torque wrench calibration regularly
Maintenance Tips
- Regularly inspect the affected area for signs of wear or damage
- Replace damaged or worn-out components promptly
- Keep the work area clean and organized
Tool Care
- Regularly clean and maintain the torque wrench
- Store the torque wrench in a dry and secure location
- Verify the torque wrench calibration before each use
Frequently Asked Questions
Find answers to common questions about torque specifications
Q1 Why are proper torque specifications crucial for the 6T70 transmission?
Why are proper torque specifications crucial for the 6T70 transmission?
Correct torque is essential to ensure proper clamping force between components, preventing leaks, component failure, and potential damage. Overtightening can strip threads or deform parts, while undertightening can cause loosening and leaks. For example, if the valve body bolts are not torqued correctly, it can lead to internal leaks and erratic shifting.
Q2 What happens if I overtighten or undertighten transmission bolts?
What happens if I overtighten or undertighten transmission bolts?
Overtightening can cause bolt stretching, thread damage, and component warping, which can lead to leaks or premature failure of seals and gaskets. Undertightening can cause bolts to loosen over time due to vibration, leading to fluid leaks, movement between mating surfaces, and ultimately, transmission damage. For example, loose bell housing bolts can cause alignment issues and drivetrain vibrations.
Q3 Should I use threadlocker on 6T70 transmission bolts?
Should I use threadlocker on 6T70 transmission bolts?
Generally, threadlocker is not required for most 6T70 transmission bolts unless specifically stated in the service manual. Using threadlocker where it's not specified could cause issues during future servicing. However, if replacing torque converter bolts or other specific high-vibration fasteners, a medium-strength (e.g., blue) threadlocker is sometimes recommended. Always consult the service manual for specific instructions.
Q4 How often should I inspect the transmission for leaks or loose bolts?
How often should I inspect the transmission for leaks or loose bolts?
Regular inspection is recommended, especially after major repairs or if you notice transmission fluid leaks. As part of routine maintenance, inspecting for any visual signs of leaks and loose bolts around the transmission case, pan, and bellhousing during oil changes is a good practice. If you hear unusual noises, this could also indicate a problem that needs investigation.
Q5 Can I reuse 6T70 transmission bolts?
Can I reuse 6T70 transmission bolts?
Some bolts, like the torque converter bolts, are often recommended to be replaced whenever removed, while other non-stretch bolts can generally be reused if they are in good condition (no damage to the threads, head, or shank). Always refer to the vehicle's service manual to determine which bolts need replacing. Using new bolts is always the safest method for a repair.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
Temperature can significantly impact torque values and fastener behavior
Cold Weather
Effects:
- Increased material brittleness
- Higher torque required due to thread contraction
- Reduced thread lubricant effectiveness
Recommendations:
- Allow components to warm to room temperature when possible
- Consider using winter-grade thread lubricants
- Check torque values more frequently during winter months
Hot Weather
Effects:
- Thermal expansion of components
- Decreased friction in threads
- Accelerated lubricant breakdown
Recommendations:
- Check torque when components are at normal operating temperature
- Use temperature-resistant thread lockers
- Consider re-torquing after heat cycles
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Humidity and Corrosion
Covers: Rust Prevention, Salt Exposure, Moisture Control
Moisture and corrosion can affect fastener integrity and torque values
High Humidity
Effects:
- Accelerated corrosion formation
- Reduced friction coefficient
- Potential thread seizing
Prevention:
- Use corrosion-resistant fasteners
- Apply appropriate anti-seize compounds
- Maintain proper protective coatings
Salt Exposure
Effects:
- Rapid corrosion development
- Thread damage
- Seized fasteners
Prevention:
- Regular underbody washing
- Use of sacrificial anodes where appropriate
- Application of protective coatings
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Seasonal Maintenance
Spring, Summer, Fall, and Winter maintenance schedules
Spring
- Inspect for winter damage
- Clean and protect exposed fasteners
- Check torque on critical components
Summer
- Monitor heat-affected components
- Check expansion-related loosening
- Inspect cooling system mounts
Fall
- Prepare for winter conditions
- Apply corrosion protection
- Verify all fasteners are properly torqued
Winter
- More frequent inspection of critical fasteners
- Check for salt damage
- Monitor suspension component torque
Related Resources
Tools, service procedures, and technical bulletins
Recommended Tools
Torque Wrench
A calibrated torque wrench is essential for applying precise torque values to transmission bolts.
- 1/2" or 3/8" drive size
- Torque range encompassing 8-100 lb-ft (approximate)
- Digital or click-type for accuracy
Socket Set (Metric)
A comprehensive set of metric sockets is required to fit the various bolts on the 6T70 transmission.
- Standard and deep sockets
- Sizes ranging from 8mm to 18mm (approximate)
- 6-point sockets recommended
Extension Bars
Various length extension bars will be useful for reaching recessed bolts.
- Multiple lengths (e.g., 3 inch, 6 inch, 10 inch)
- 1/2" or 3/8" drive size
- Secure locking mechanism
Universal Joint
A universal joint can aid in accessing bolts at difficult angles.
- 1/2" or 3/8" drive size
- Durable construction
- Smooth rotation
Service Procedures
6T70 Transmission Pan Removal and Installation
This procedure outlines the steps for removing and installing the transmission pan, including proper bolt torquing.
- 1. Drain the transmission fluid.
- 2. Loosen and remove all transmission pan bolts, allowing fluid to drain.
- 3. Carefully remove the pan and gasket.
- 4. Clean the pan and transmission mating surfaces.
- 5. Install a new gasket on the pan.
- 6. Reinstall the pan and begin tightening bolts in a criss-cross pattern.
- 7. Torque the pan bolts to the specified torque of 106 lb-in (12 Nm) using a calibrated torque wrench.
- 8. Fill the transmission with the appropriate fluid.
6T70 Transmission Control Valve Body Removal and Installation
This procedure outlines the steps for removing and installing the transmission control valve body, including proper bolt torquing.
- 1. Remove the transmission pan and filter.
- 2. Disconnect any electrical connectors from the valve body.
- 3. Loosen and remove all valve body bolts, noting their location.
- 4. Carefully remove the valve body.
- 5. Install the replacement valve body.
- 6. Reinstall the valve body bolts and begin tightening in a criss-cross pattern.
- 7. Torque the valve body bolts to the specified torque of 89 lb-in (10 Nm) using a calibrated torque wrench.
- 8. Install a new pan gasket and reinstall the pan.
- 9. Fill the transmission with the appropriate fluid.
6T70 Transmission Cooler Line Connections
This procedure outlines the steps for properly securing the transmission cooler lines, paying specific attention to torque
- 1. Inspect cooler line connections for damage.
- 2. If necessary, clean any surfaces which mate with the transmission.
- 3. Using new gaskets or O-rings as required, carefully connect the lines to the appropriate ports.
- 4. Tighten cooler line connection bolts to 18 lb-ft (25 Nm) using a calibrated torque wrench.
6T70 Transmission Case Bolts
This procedure outlines the steps for properly torqueing the various case bolts.
- 1. Identify the specific bolts you are removing/installing.
- 2. Refer to the proper torque values for these bolts (may vary by location).
- 3. Use a calibrated torque wrench to torque bolts to the proper specification.
- 4. Most case bolts on the 6T70 will be torqued to approximately 30-37 lb-ft (41-50 Nm).
Technical Service Bulletins
GM Transmission Fluid Leakage from Pan
2017-03-15Some 2013-2019 Cadillac XTS models may exhibit a transmission fluid leak from the pan gasket due to improper sealing or bolt torque.
Resolution: Ensure the pan mating surfaces are clean and use a new gasket. Properly torque the pan bolts to 106 lb-in (12 Nm) using a calibrated torque wrench. If issue continues, check pan for distortion and/or check transmission case mating surface.
6T70 Transmission Valve Body Malfunction
2018-09-28Reports of transmission issues related to the 6T70 may stem from a faulty or sticking control valve body. Proper installation and torque is critical.
Resolution: Inspect valve body and ensure proper torquing of bolts (89 lb-in or 10 Nm). Use a torque wrench to confirm these settings. If symptoms persist, replacement of the control valve body may be necessary. Also inspect all valve body surfaces for smooth operation.
6T70 Transmission Case Bolt Torque Variation
2015-05-10Specific case bolt torques may vary across different case locations. Consult the service manual for proper torque values. Over or under torquing can lead to structural failure.
Resolution: Always consult the service manual for proper torques based on location. Most case bolts torque to approximately 30-37 lb-ft (41-50 Nm). Use a calibrated torque wrench when tightening.
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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.