Pontiac Pontiac G8 2008-2009 Drivetrain Bolt Torque Specifications & Fastener Values
Pontiac Pontiac G8 2008-2009

Pontiac Pontiac G8 2008-2009 Drivetrain Bolt Torque Specifications

Detailed drivetrain bolt torque specifications for the 2008-2009 Pontiac G8, including transmission, driveshaft, and differential bolts.

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 flywheel

This section includes torque specifications for the engine and flywheel assembly, including the flywheel bolts, crankshaft pulley/harmonic balancer bolt, and engine block to transmission bellhousing bolts.

1

Flywheel Bolts

M12 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Proper torque ensures the flywheel is properly seated and the engine's rotational energy is transferred to the transmission.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M14 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Proper torque ensures the pulley/balancer is properly seated and the engine's rotational energy is transferred to the serpentine belt.
3

Engine Block to Transmission Bellhousing Bolts

M10 x 1.25
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the engine and transmission are properly aligned and supported.

Transmission

This section includes torque specifications for the transmission assembly, including the transmission mounting bolts, transmission oil pan bolts, and transmission crossmember bolts.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Proper torque ensures the transmission is properly aligned and supported.
2

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
106 in-lbs (12 N·m)
Important Notes
Proper torque ensures the oil pan is properly sealed and the transmission's lubrication system is maintained.
3

Transmission Crossmember Bolts

M14 x 1.5
Torque Value
129 ft-lbs (175 N·m)
Important Notes
Proper torque ensures the transmission is properly supported and aligned.

Drivetrain

This section includes torque specifications for the drivetrain assembly, including the drive axle/half shaft bolts, CV joint/axle nut, propeller/drive shaft bolts, differential drain/fill plug, differential cover bolts, and axle/half shaft retaining bolts.

1

Drive Axle/Half Shaft Bolts

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Proper torque ensures the axle/half shaft is properly seated and the drivetrain's rotational energy is transferred to the wheels.
2

CV Joint/Axle Nut

M18 x 1.5
Torque Value
159 ft-lbs (215 N·m)
Important Notes
Proper torque ensures the CV joint is properly seated and the drivetrain's rotational energy is transferred to the wheels.
3

Propeller/Drive Shaft Bolts

M10 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Proper torque ensures the propeller/drive shaft is properly seated and the drivetrain's rotational energy is transferred to the wheels.
4

Differential Drain/Fill Plug

M12 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Proper torque ensures the plug is properly sealed and the differential's lubrication system is maintained.
5

Differential Cover Bolts

M10 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Proper torque ensures the differential cover is properly sealed and the differential's lubrication system is maintained.
6

Axle/Half Shaft Retaining Bolts

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Proper torque ensures the axle/half shaft is properly seated and the drivetrain's rotational energy is transferred to the wheels.

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

What is the recommended torque specification for the driveshaft bolts on a 2008-2009 Pontiac G8?

The recommended torque specification for the driveshaft bolts on a 2008-2009 Pontiac G8 is 30 ft-lbs (40 Nm) for the front driveshaft bolts and 40 ft-lbs (54 Nm) for the rear driveshaft bolts.

Q2

How often should I check the drivetrain bolt torque specifications on my 2008-2009 Pontiac G8?

It is recommended to check the drivetrain bolt torque specifications every 12,000 to 15,000 miles (19,312 to 24,140 km) or as specified in the owner's manual. Additionally, check the torque specifications after any maintenance or repairs that involve the drivetrain system.

Q3

What happens if I over-torque the drivetrain bolts on my 2008-2009 Pontiac G8?

Over-torquing the drivetrain bolts can cause damage to the bolts, threads, or surrounding components. This can lead to costly repairs, reduced performance, and potentially cause the vehicle to become unsafe to operate.

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

  • Metric and SAE sizes
  • Ratchet and extension included
Learn more

Breaker Bar

A long, flexible bar for applying extra torque

  • Heat-treated 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
  • Check the torque value using a breaker bar and socket
View full procedure

Driveshaft Bolt Replacement

A step-by-step guide to replacing the driveshaft bolts

  • Raise the vehicle and support it with jack stands
  • Remove the driveshaft bolts using a socket and breaker bar
  • Install new driveshaft bolts and apply the recommended torque value
View full procedure
Technical Service Bulletins

Drivetrain Bolt Torque Specification Update

2009-02-15

An update to the drivetrain bolt torque specification for the 2008-2009 Pontiac G8

2008-2009 Pontiac G8

Resolution: Apply the updated torque value to the drivetrain bolts to ensure proper installation and prevent damage

Driveshaft Bolt Failure

2008-08-20

A technical bulletin regarding driveshaft bolt failure in the 2008-2009 Pontiac G8

2008-2009 Pontiac G8

Resolution: Inspect the driveshaft bolts for signs of wear or damage and replace them as necessary

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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