Buick Regal 2011-2017 Drivetrain Bolt Torque Specifications & Fastener Values
Buick Regal 2011-2017

Buick Regal 2011-2017 Drivetrain Bolt Torque Specifications

This page provides detailed torque specifications for various drivetrain bolts on the 2011-2017 Buick Regal, including transmission, driveshaft, differential, and axle components.

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

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Torque Calculator

Convert between different torque units

Transmission

Torque specifications for various components of the automatic transmission, including pan, case, bellhousing, mount, valve body, and torque converter.

1

Transmission Pan Bolts

M6 x 1.0
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Secures the transmission pan to the case, creating a seal for transmission fluid. Proper torque prevents leaks and ensures pan gasket sealing. Source: Similar year/model GM transmission specification.
2

Transmission Case Bolts (general)

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Bolts used to join various sections of the transmission case. Proper torque prevents leaks and ensures structural integrity. Source: Industry standard for similar bolt sizes in transmission casings.
3

Transmission Bellhousing Bolts (Engine to Trans)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transmission to the engine block. Critical for powertrain alignment and stability. Ensures correct engagement of the input shaft. Source: Similar Buick model specification with similar transmissions.
4

Transmission Mount Bolts (Transmission to Chassis/Subframe)

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Secures the transmission mount, which isolates vibrations and maintains position. Prevents excessive movement and wear. Source: Estimated, Industry standard for similar sized mount bolts.
5

Valve Body Bolts

M5 x 0.8
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the valve body within the transmission. Proper torque is critical to prevent internal leaks and ensure proper hydraulic operation. Source: Similar GM transmission specification.
6

Torque Converter to Flexplate Bolts

M10 x 1.5
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Secures the torque converter to the engine flexplate, transferring engine power. Proper torque is crucial to prevent vibrations and damage to the flexplate and converter. Source: Industry standard for similar application.
7

Transmission Fluid Drain Plug

M18 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Seals the transmission fluid drain hole and prevents leaks. Over-tightening can damage the threads and cause leaks. Source: Similar GM transmission specification.

Driveshaft Halfshafts

Torque specifications for driveshaft and halfshaft components, including center support bearing, differential flange, transmission flange, and wheel hub.

1

Driveshaft Center Support Bearing Bolts

M10 x 1.5
Torque Value
28 ft-lbs (38 N·m)
Important Notes
Secures the center support bearing of a two-piece driveshaft. Ensures proper driveline alignment and minimizes vibrations. Source: Estimated, Industry Standard for this type of application.
2

Driveshaft to Rear Differential Flange Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Attaches the driveshaft to the differential. Must be properly torqued to ensure secure power transfer and prevent vibration. Source: Estimated, Industry Standard for this type of application.
3

Front Axle/Halfshaft to Transmission Flange Bolts

M8 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Connects the inner CV joint to the transmission. Proper torque is critical to ensure secure transfer of power to the front wheels and to prevent joint damage. Source: Similar Buick model specification.
4

Front Axle/Halfshaft to Wheel Hub Nut/Bolt

M24 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Critical fastener securing the wheel hub to the axle. Proper torque is ESSENTIAL to safe operation. Usually a new nut is used every time. Source: Similar Buick model specification.

Rear Differential

Torque specifications for rear differential components, including case, cover, ring gear, pinion flange, and mount.

1

Differential Case Bolts

M12 x 1.75
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Secures the differential housing components. Ensuring proper sealing and structural integrity. Source: Industry standard for similar differential case bolts.
2

Differential Cover Bolts

M10 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the differential cover, containing the gear oil. Proper torque prevents leaks and ensures proper sealing with the gasket. Source: Similar GM differential specification.
3

Ring Gear Bolts (inside differential)

M12 x 1.5
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Secures the ring gear to the differential carrier. Proper torque is absolutely critical for proper gear mesh and power transfer. Should be torqued in a star pattern. Critical Bolt. Source: Industry standard for similar differential ring gears.
4

Pinion Flange Nut (Differential)

M20 x 1.5
Important Notes
Secures the pinion shaft and bearing preload. Incorrect torque can cause premature bearing failure and differential noise. Torque is critical and requires preload measurement. Estimated preload value, must consult repair manual if not experienced. Critical Bolt. Source: Industry standard with an estimated preload.
5

Differential Mount Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Secures the differential to the vehicle frame or subframe. Critical for minimizing vibrations and maintaining position. Source: Estimated, Industry standard for similar sized mount bolts.

Transfer Case

Torque specifications for transfer case components, including case-to-transmission bolts, housing bolts, and fluid drain/fill plugs.

1

Transfer Case to Transmission Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Secures the transfer case to the transmission. Proper torque ensures alignment and prevents leaks or separation during operation. Source: Similar Buick model specifications.
2

Transfer Case Housing Bolts

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the transfer case housing components. Ensures a tight seal, protecting internal components. Source: Estimated, Industry Standard for similar application.
3

Transfer Case Fluid Drain/Fill Plugs

M18 x 1.5
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Seals the fluid drain and fill holes. Prevents leaks and ensures proper operation. Source: Similar GM transfer case specification

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 proper torque specifications important for drivetrain bolts?

Proper torque ensures that bolts are tightened to the correct tension. Under-torquing can lead to loosening, causing vibrations, component damage, and potential failure. Over-torquing can stretch or break bolts, damage threads, and compromise the integrity of the joint. Correct torque is essential for component longevity, safe operation, and maintaining designed performance.

Q2

What happens if I overtighten a driveshaft bolt?

Overtightening a driveshaft bolt can lead to several issues. It can stretch the bolt beyond its yield strength, potentially causing it to weaken or snap. This can also damage the threads in the receiving component, requiring costly repairs. Additionally, excessive torque can distort the flanges or yokes, leading to imbalance and premature wear of the driveshaft and its connected components. Example: Overtightening the bolts on the flex disc can lead to premature cracking and failure of the disc.

Q3

Can I reuse drivetrain bolts after removal?

Generally, it's recommended to replace critical drivetrain bolts, especially those that are torque-to-yield (TTY) or torque-angle bolts. These bolts are designed to stretch when tightened and should not be reused. Reusing them can compromise their clamping force and lead to failure. If your repair manual specifically states to replace a bolt, always replace it. Example: Driveshaft bolts are often TTY and should be replaced. Consult your repair manual for specific recommendations.

Q4

Where can I find the correct torque specifications for my 2011-2017 Buick Regal drivetrain?

The best place to find the correct torque specifications is your vehicle's repair manual (e.g., Haynes, Chilton, or the factory service manual). You can also find this information through online subscription services that provide professional repair data like ALLDATA or Mitchell1. Some auto parts websites might also list torque specs, but it’s best to verify this information against the manual. Avoid relying on forums or random web pages, as accuracy is not always guaranteed.

Q5

What is the difference between lb-ft and Nm when measuring torque?

lb-ft (pound-feet) and Nm (Newton-meters) are both units of torque, but they represent different measurement systems. lb-ft is an imperial unit commonly used in the United States, while Nm is the metric unit used in most of the world. When working with torque specifications, always double-check the unit and ensure your torque wrench is calibrated to the correct unit. It is very important to use a conversion table if your tool is in the wrong measurement.

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 used to apply a specific amount of torque to fasteners.

  • Accurate torque measurement
  • Click-type or digital readout
  • Variety of drive sizes (3/8", 1/2", etc.)
Learn more

Socket Set

A set of sockets with various sizes to fit different bolt and nut heads.

  • Standard (SAE) and Metric sizes
  • 6-point or 12-point designs
  • Variety of drive sizes to match torque wrench
Learn more

Extension Bars

Used to extend the reach of the torque wrench and sockets.

  • Various lengths available
  • Different drive sizes
  • Solid construction for durability
Learn more

Universal Joint

Allows the socket to reach fasteners at an angle.

  • Varying drive sizes
  • Allows access to hard-to-reach bolts
  • Durable construction
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

Properly torquing driveshaft bolts is crucial for safe and reliable operation. Incorrect torque can lead to vibration, component failure, or premature wear.

  • 1. Consult the vehicle-specific service manual to find the exact torque specification for your model year Buick Regal.
  • 2. Ensure all bolt threads are clean and free of debris. Lightly lubricate threads with clean engine oil or anti-seize compound if specified.
  • 3. Position the driveshaft properly and install all bolts finger-tight.
  • 4. Using the torque wrench and the correct socket, tighten each bolt to 1/3 of the specified torque in a star pattern.
  • 5. Increase the torque to 2/3 of the specification, again following a star pattern.
  • 6. Finally, tighten each bolt to the full specified torque using the same star pattern.
  • 7. After driving for a short period (100-200 miles), re-torque the driveshaft bolts to ensure they remain at the correct specification.
View full procedure

Axle Nut Torque Procedure

Proper torque is critical for axle nuts to ensure proper wheel bearing function and joint integrity. Over or under torquing can lead to premature wear and failure.

  • 1. Consult the vehicle-specific service manual for the correct axle nut torque specification for your Buick Regal model year and configuration. Note if single use nut is specified
  • 2. Ensure the axle threads are clean and the new nut is installed in proper alignment.
  • 3. For new single use axle nuts always follow the specific sequence as designated in service manual, usually applying initial torque, rotating to next stage, and the final torque. If using reusable nut apply in a star pattern.
  • 4. Use a properly calibrated torque wrench with the correct socket size for the axle nut to tighten to the specified torque. If single use bolt is required, install a new axle nut.
  • 5. If cotter pin hole alignment is needed, do not back nut off to align, always tighten the nut up to a maximum of 1/8 of a turn.
  • 6. Install new cotter pin if required.
View full procedure

Differential Cover Bolt Torque Procedure

Correct tightening of differential cover bolts prevents leaks and maintains a proper seal. Improper tightening could result in leaks or component damage.

  • 1. Refer to the service manual for the specific torque specification for the differential cover bolts on your Buick Regal.
  • 2. Clean the differential cover and mating surface to ensure a clean sealing surface.
  • 3. Install the new gasket or sealant as specified by the manufacturer. Start all bolts by hand.
  • 4. Using the torque wrench and appropriate socket, tighten the bolts in a star pattern, moving in small increments of torque, using the correct sequence to the specified torque.
  • 5. Do not over-tighten the bolts, as this can cause damage to the gasket or the differential casing.
  • 6. After driving for a short period (100-200 miles), inspect for leaks and re-torque the bolts if necessary.
View full procedure
Technical Service Bulletins

Driveshaft Vibration at High Speed

2015-03-15

Some 2011-2015 Buick Regal models may exhibit driveshaft vibration at highway speeds. This can often be attributed to improper driveshaft bolt torque or worn u-joints.

2011-2015

Resolution: Verify driveshaft bolt torque using the correct procedure and replace u-joints if necessary. Inspect for any damage to the driveshaft. Rebalance if needed.

Rear Differential Oil Leak

2016-11-20

Reports of oil leaks from the rear differential cover on 2013-2017 Buick Regal models have been noted. Check for correct torque of cover bolts and condition of the gasket.

2013-2017

Resolution: Ensure proper cleaning of the differential cover surfaces and correct torque sequence. Replace differential cover gasket as needed. Always use the specified gasket or sealant.

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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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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