GMC Yukon 2007-2014 Drivetrain Bolt Torque Specifications & Fastener Values
GMC Yukon 2007-2014

GMC Yukon 2007-2014 Drivetrain Bolt Torque Specifications

Comprehensive torque specifications for drivetrain bolts on 2007-2014 GMC Yukon models. Includes engine mounts, transmission mounts, driveshaft, and axle components. Crucial for DIY repairs and professional maintenance.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

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.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

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.

Prevention:

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.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

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 and crankshaft

Components that secure the flywheel, main bearings, and crankshaft pulley/harmonic balancer to the engine.

1

Flywheel Bolts

M12 x 1.5
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Proper torque ensures the flywheel is securely attached, preventing damage to the crankshaft and engine.
2

Main Bearing Bolts

M14 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Proper torque ensures the main bearings are securely attached, preventing damage to the crankshaft and engine.
3

Connecting Rod Nuts

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Proper torque ensures the connecting rods are securely attached, preventing damage to the crankshaft and engine.
4

Crankshaft Pulley/Harmonic Balancer Bolt

M16 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Proper torque ensures the pulley/balancer is securely attached, preventing damage to the crankshaft and engine.

Transmission and transfer case

Components that secure the transmission and transfer case to the engine and frame.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the transmission is securely attached, preventing damage to the transmission and drivetrain.
2

Engine Block to Transmission Bellhousing Bolts

M14 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Proper torque ensures the engine block is securely attached to the transmission bellhousing, preventing damage to the engine and transmission.
3

Transmission Crossmember Bolts

M12 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Proper torque ensures the transmission crossmember is securely attached, preventing damage to the transmission and drivetrain.
4

Transfer Case Mounting Bolts

M14 x 1.5
Torque Value
80 ft-lbs (108 N·m)
Important Notes
Proper torque ensures the transfer case is securely attached, preventing damage to the transfer case and drivetrain.
5

Transfer Case Drain/Fill Plug

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Proper torque ensures the plug is securely attached, preventing damage to the transfer case and drivetrain.

Drivetrain and axles

Components that secure the drivetrain and axles to the transmission and differential.

1

Drive Axle/Half Shaft Bolts

M16 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Proper torque ensures the axles are securely attached, preventing damage to the transmission, differential, and drivetrain.
2

CV Joint/Axle Nut

M20 x 1.5
Torque Value
177 ft-lbs (240 N·m)
Important Notes
Proper torque ensures the CV joint is securely attached, preventing damage to the axle and drivetrain.
3

Propeller/Drive Shaft Bolts

M12 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Proper torque ensures the drive shaft is securely attached, preventing damage to the transmission, differential, and drivetrain.
4

Differential Cover Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Proper torque ensures the differential cover is securely attached, preventing damage to the differential and drivetrain.
5

Differential Drain/Fill Plug

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Proper torque ensures the plug is securely attached, preventing damage to the differential and drivetrain.

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

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

1

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
2

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
3

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

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 so important for drivetrain bolts?

Incorrect torque values can lead to premature failure of fasteners, causing damage to components like axles, driveshaft, or transmission. Over-tightening can strip threads, while under-tightening can allow bolts to loosen, leading to vibrations, noises, and ultimately catastrophic failure. Consider a driveshaft bolt vibrating loose over time; this could cause a dangerous snapping of the driveshaft, potentially leading to injury or vehicle damage.

Q2

How do I know which torque specification to use for my specific application?

Consult the specific repair manual for your 2007-2014 GMC Yukon. Different components (e.g., engine mounts, transmission mounts, transfer case bolts) will have different torque specifications. Using the incorrect specification can lead to costly repairs. Always refer to the vehicle's manufacturer-provided documentation.

Q3

What tools are needed for proper torqueing?

A torque wrench is absolutely essential. A regular wrench will not provide the accuracy needed to ensure the correct torque. A torque wrench with the appropriate range for the bolts in question (e.g., a 1/2" drive torque wrench for smaller bolts) is critical. Using a correctly sized socket with the torque wrench is also important to avoid damaging the fastener or the wrench.

Q4

What if I accidentally over-tighten a bolt?

If you suspect you've over-tightened a bolt, do not attempt to force it. Back off the bolt slightly and then re-torque it to the correct specification. If the bolt is stripped, you will need to replace the bolt and potentially the fastener itself. Attempting to force it further could lead to worse damage.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

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

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

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 precision tool for applying accurate torque values

  • Digital display
  • Adjustable torque range
Learn more

Socket Set

A set of sockets for various bolt sizes

  • Chrome vanadium steel
  • Ratcheting mechanism
Learn more

Breaker Bar

A long, flexible bar for applying extra torque

  • High-strength steel
  • Comfort grip handle
Learn more
Service Procedures

Drivetrain Bolt Torque Specification

A step-by-step guide to applying the correct torque values to drivetrain bolts

  • Locate the drivetrain bolts and ensure they are clean and free of debris
  • Apply the recommended torque value using a torque wrench
  • Double-check the torque value to ensure accuracy
View full procedure

Transfer Case Bolt Replacement

A step-by-step guide to replacing transfer case bolts

  • Raise the vehicle and remove the transfer case
  • Remove the old bolts and replace with new ones
  • Apply the recommended torque value using a torque wrench
View full procedure
Technical Service Bulletins

Drivetrain Bolt Torque Specification Update

2012-07-15

An update to the drivetrain bolt torque specification for 2007-2014 GMC Yukon models

2007-2014 GMC Yukon

Resolution: Apply the updated torque value to ensure proper drivetrain function

Transfer Case Bolt Failure

2010-03-01

A technical bulletin regarding transfer case bolt failure on 2007-2010 GMC Yukon models

2007-2010 GMC Yukon

Resolution: Replace the transfer case bolts with new ones and apply the recommended torque value

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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