GMC Yukon 2015-2020 Drivetrain Bolt Torque Specifications
Comprehensive torque specifications for drivetrain bolts on 2015-2020 GMC Yukon models. Includes engine mounts, transmission mounts, exhaust system bolts, and other critical components. Essential for DIY repairs and professional maintenance.
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
Engine block and crankshaft
Components that secure the crankshaft and main bearings, ensuring smooth engine operation.
1 Main Bearing Bolts
M14 x 1.5
Main Bearing Bolts
M14 x 1.5Torque Value
Important Notes
Flywheel and crankshaft pulley
Components that secure the flywheel and crankshaft pulley, ensuring proper power transmission.
1 Flywheel Bolts
M16 x 1.5
Flywheel Bolts
M16 x 1.5Torque Value
Important Notes
2 Crankshaft Pulley/Harmonic Balancer Bolt
M18 x 1.5
Crankshaft Pulley/Harmonic Balancer Bolt
M18 x 1.5Torque Value
Important Notes
Transmission and mounting
Components that secure the transmission to the engine block, ensuring proper alignment and minimizing vibration.
1 Transmission Mounting Bolts
M12 x 1.5
Transmission Mounting Bolts
M12 x 1.5Torque Value
Important Notes
2 Transmission Oil Pan Bolts
M10 x 1.5
Transmission Oil Pan Bolts
M10 x 1.5Torque Value
Important Notes
Drive axle and half shaft
Components that secure the half shafts, ensuring proper power transmission to the wheels.
1 Drive Axle/Half Shaft Bolts
M14 x 1.5
Drive Axle/Half Shaft Bolts
M14 x 1.5Torque Value
Important Notes
Cv joint and axle nut
Components that secure the CV joint, ensuring smooth and consistent power transfer to the wheels.
1 CV Joint/Axle Nut
M20 x 1.5
CV Joint/Axle Nut
M20 x 1.5Torque Value
Important Notes
Propeller/drive shaft
Components that secure the propeller shaft, ensuring proper power transmission to the rear axle.
1 Propeller/Drive Shaft Bolts
M12 x 1.5
Propeller/Drive Shaft Bolts
M12 x 1.5Torque Value
Important Notes
Differential and transfer case
Components that secure the differential and transfer case, ensuring proper lubrication and power transmission.
1 Differential Drain/Fill Plug
M14 x 1.5
Differential Drain/Fill Plug
M14 x 1.5Torque Value
Important Notes
2 Transfer Case Drain/Fill Plug
M14 x 1.5
Transfer Case Drain/Fill Plug
M14 x 1.5Torque Value
Important Notes
Differential carrier cover
Components that secure the differential carrier cover, ensuring proper lubrication and protection of internal components.
1 Differential Carrier Cover Bolts
M14 x 1.5
Differential Carrier Cover Bolts
M14 x 1.5Torque Value
Important Notes
Axle shaft retaining bolt
Components that secure the axle shaft, ensuring proper power transmission to the wheels.
1 Axle Shaft Retaining Bolt
M18 x 1.5
Axle Shaft Retaining Bolt
M18 x 1.5Torque 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 torque specifications important for drivetrain components?
Why are torque specifications important for drivetrain components?
Proper torque ensures secure connections in the drivetrain. Insufficient torque can lead to loosening, potentially causing damage from vibrations and misalignment. Excessive torque can damage threads or components, leading to premature failure. Following the specified torque values helps prevent these issues and ensures the drivetrain functions correctly and safely.
Q2 What happens if I use the wrong torque setting for a drivetrain bolt?
What happens if I use the wrong torque setting for a drivetrain bolt?
Using incorrect torque settings can cause problems ranging from minor issues like a loose axle nut to major failures like a transmission shaft snapping. For example, a slightly loose driveshaft coupling could lead to a vibration that is uncomfortable and costly to diagnose down the line. In contrast, over-torquing an axle nut can strip the threads, requiring more extensive repairs.
Q3 How do I know which torque specification to use for a specific bolt?
How do I know which torque specification to use for a specific bolt?
Always consult the specific torque specifications in the repair manual for the 2015-2020 GMC Yukon. These specifications are critical for each component. The manual will provide the correct torque settings for different bolts and nuts within the drivetrain, including the engine mounts, transmission mounts, driveshaft, axles, and differential.
Q4 What tools are needed for accurate torqueing?
What tools are needed for accurate torqueing?
A torque wrench is absolutely essential. A regular wrench, while sometimes used for preliminary loosening, is insufficient for accurate torqueing. A digital torque wrench is recommended for precise control and readings. Ensure the torque wrench is calibrated regularly and appropriate for the size and type of fastener. Using a digital torque wrench allows for visual confirmation of the exact torque value, minimizing the risk of errors.
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 precise torque application.
- Digital readout for accurate torque readings
- Various size attachments for different bolt sizes
- Proper handle design for comfortable use
Socket Set
A comprehensive set of sockets for various bolt sizes and types used in the drivetrain.
- Combination and open-end sockets
- Metric and standard sizes
- Sockets with extensions for difficult-to-reach fasteners
Ratchet
Provides leverage for tightening and loosening bolts.
- Various sizes and styles
- Extended reach ratchets for hard-to-reach areas
Impact Wrench (Optional)
Useful for quickly tightening bolts, especially in tight spaces.
- High torque output
- Variable speed settings
Grease Gun
For lubrication of drivetrain components, especially during installation.
- Various nozzle sizes
- Easy to use
Service Procedures
Differential Mount Bolt Torque Procedure
Procedure for tightening differential mount bolts to the correct specifications.
- Ensure the vehicle is securely supported.
- Apply specified torque to each bolt in a star pattern, ensuring even pressure.
- Verify all bolts are tightened to the correct specifications using a calibrated torque wrench.
- Check for any leaks or damage to the differential housing
Transmission Mount Bolt Torque Procedure
Procedure for tightening transmission mount bolts to the correct specifications.
- Ensure the transmission is properly aligned.
- Gradually tighten each bolt in a star pattern to the prescribed torque.
- Verify torque with a calibrated torque wrench.
- Inspect for any damage or misalignment of the transmission mount.
Drive Shaft Installation Procedure
Procedure for installing and properly torquing drive shaft fasteners.
- Ensure proper alignment of the drive shaft.
- Tighten all coupling bolts to the specified torque values.
- Check for any signs of misalignment or damage during installation.
Technical Service Bulletins
Incorrect Differential Mount Bolt Torque Causing Leakage
2023-03-15Incorrect differential mount bolt torque can lead to fluid leaks.
Resolution: Ensure proper torque application of all differential mount bolts per the updated service manual.
Transmission Mount Bolt Loosening During Operation
2022-11-22Transmission mount bolts have been reported to loosen under certain driving conditions.
Resolution: Verify proper torque on all transmission mount bolts during routine inspections. If loosening is suspected, re-torque to the specified value.
About the Author
Expert automotive knowledge and experience
'/%3E%3Cpath d='M60 30a20 20 0 1 1 0 40 20 20 0 0 1 0-40zm0 45c16.5 0 30 7.5 30 16.8V100H30v-8.2c0-9.3 13.5-16.8 30-16.8z' fill='%23404040'/%3E%3C/svg%3E)
Diagnostic
Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.
Repair
Expert in both traditional mechanical repairs and modern vehicle systems.
Additional Expertise
Documentation
Created over 500 detailed repair guides and technical documents.
Training
Conducted technical training sessions and contributed to repair databases.
Certifications & Research
Certifications
- ASE Master Technician Certification
- Advanced Diagnostic Specialist
- Hybrid/Electric Vehicle Systems
- Performance Tuning Expert
Research & Community
Actively researches emerging technologies and contributes to automotive forums.
Legal Disclaimer
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.
General Information
Warranty & Liability
The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.
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.