Buick Verano 2012-2017 Drivetrain Bolt Torque Specifications & Fastener Values
Buick Verano 2012-2017

Buick Verano 2012-2017 Drivetrain Bolt Torque Specifications

Detailed torque specifications for various drivetrain bolts on the 2012-2017 Buick Verano, including transmission mounts, driveshaft, 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

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Transmission Transaxle

Torque specifications for the automatic transmission/transaxle assembly, including case, mounting, and related components. These values are crucial for maintaining structural integrity and preventing fluid leaks.

1

Transmission Case Bolts

M8 x 1.25
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures the two halves of the transmission case together. Proper torque is crucial for maintaining fluid seals and structural integrity. Estimated value based on industry standard for this bolt size.
2

Transmission Mount Bolts

M10 x 1.5
Torque Value
41 ft-lbs (55 N·m)
Important Notes
Attaches the transmission to the vehicle's frame. Proper torque is critical for vibration control, secure engine/transmission alignment, and preventing movement. Estimated value based on similar applications.
3

Transmission Pan Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the transmission pan to the transmission case. Prevents fluid leaks and ensures proper sealing. Torque in a star pattern. Estimated value based on similar applications.
4

Transmission Fluid Drain Plug

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Seals the transmission fluid drain hole to prevent leaks. Over tightening can damage the case. Estimated value based on industry standard.
5

Torque Converter Bolts to Flexplate

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connects the torque converter to the engine's flexplate, transmitting engine power to the transmission. These bolts usually require a thread locking compound. Estimated value based on similar applications.
6

Transmission Control Module (TCM) Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Attaches the TCM to the transaxle case. Proper torque is necessary for a secure connection. Estimated value based on similar applications.

Differential

Torque specifications for the differential assembly, which is integrated into the transaxle in this FWD application. These values are important for proper gear meshing, bearing preload, and overall functionality.

1

Differential Cover Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the differential cover. These should be torqued in a star pattern. Estimated value based on industry standard.
2

Differential Carrier Bearing Cap Bolts

M10 x 1.5
Important Notes
Secures the differential bearings. This is critical for proper preload. Angular torque procedure. Estimated value based on similar applications.
3

Differential Ring Gear Bolts

M10 x 1.25
Important Notes
Fastens the ring gear to the differential case. This is essential for proper power transmission. These will likely need to be torqued in a star pattern. Angular torque procedure. Estimated value based on similar applications.

Drive Axles Halfshafts

Torque specifications for the drive axles and halfshafts, including CV joint attachments and wheel hub connections. These values are crucial for secure power transmission to the wheels and safe vehicle operation.

1

Inner CV Joint Bolts to Transmission

M8 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Secures the inner CV joint to the transmission. Important for transmitting power from the transaxle to the wheels. Estimated value based on similar applications.
2

Wheel Hub/Bearing Assembly Bolts

M12 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
Attaches the wheel hub to the steering knuckle. Proper torque ensures secure wheel mounting and bearing life. Estimated value based on similar applications.
3

Axle Nut (Front Wheel Hub)

M24 x 1.5
Torque Value
155 ft-lbs (210 N·m)
Important Notes
Secures the drive axle to the wheel hub. Critical for wheel retention. Always use a new axle nut. Estimated value based on similar applications.
4

Outer CV Joint-to-Hub Nut

M24 x 1.5
Torque Value
155 ft-lbs (210 N·m)
Important Notes
Holds the CV joint in the wheel hub. Proper torque is essential for joint stability and wheel security. Estimated value based on similar applications.

Engine To Transmission

Torque specifications for components that connect the engine and transmission, including bellhousing bolts and starter motor bolts. Proper torque is essential for secure alignment and preventing vibration.

1

Engine-to-Transmission Bellhousing Bolts

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Secures the transmission to the engine block. Proper torque is critical for preventing misalignment and vibration. These may require a specific tightening sequence. Estimated value based on industry standard.
2

Starter Motor Bolts

M10 x 1.5
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Secures the starter to the bellhousing. Proper torque is needed for starter alignment and secure mount. Estimated value based on similar applications.

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?

Correct torque ensures proper clamping force between components, preventing loosening, leaks, and premature wear. Under-torqued bolts can lead to components shifting, while over-torqued bolts can cause damage like stripped threads or bolt fatigue. In the drivetrain, this is crucial to maintaining the integrity of the transmission, axles, and differential.

Q2

What happens if I over-torque a bolt?

Over-torquing can stretch the bolt beyond its yield point, weakening it and potentially causing it to break. It can also damage the threads in the housing or component, making it difficult to remove or properly tighten in the future. This is especially problematic with drivetrain components due to the high stress they experience. For example, over-torquing axle flange bolts could lead to cracking or premature failure of the flange.

Q3

What if I don't have a torque wrench?

While a torque wrench is the most accurate tool, you should not rely on just 'feel' for drivetrain components. If you do not have a torque wrench, you should consider renting one from an auto parts store or purchasing a relatively inexpensive one. In a pinch, if you MUST proceed without one, be extremely cautious to not over-tighten the bolts. Err on the side of slightly under-tightening, and plan to have the vehicle properly checked and retorqued soon. Never over-tighten - it is far more dangerous.

Q4

Do I need to use new bolts when working on drivetrain components?

It is often recommended to use new bolts for critical drivetrain components such as axle bolts, drive shaft bolts, and transmission mounts. Many bolts are 'torque-to-yield' which means they are designed to stretch slightly, and are not suitable for reuse. Reusing these bolts may compromise their clamping force, and can cause issues later. Always check the vehicle service manual or repair guidelines for specific bolt replacement recommendations.

Q5

Do torque specifications change if I'm using aftermarket parts?

Yes, torque specifications may vary if you are using aftermarket components. Always refer to the installation instructions provided by the aftermarket part manufacturer. They should specify any different torque values required. For instance, aftermarket axles may have different flange designs which may require modified torque specs to ensure proper installation.

Q6

Should I use any lubricant on the bolts before tightening?

Some bolts may require a specific type of lubricant on the threads before tightening to achieve accurate torque values. Always refer to your vehicles service manual for the specific guidance. Using lubricant where it is not needed, or not using it where needed, may result in over or under-torqued bolts. Usually when a lubricant is required, the manual will specify what kind - such as engine oil or a specific anti-seize product.

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 (1/2" Drive)

A calibrated torque wrench is essential for accurately applying torque to drivetrain bolts. 1/2" drive is recommended for common sizes used in the Verano's drivetrain.

  • Accuracy within +/- 3%
  • Wide torque range (e.g., 20-150 lb-ft)
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for smaller bolts and hard-to-reach locations. Useful for applications with lower torque specifications.

  • Accuracy within +/- 3%
  • Torque range (e.g., 5-80 lb-ft)
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes to fit all the drivetrain fasteners on the Verano.

  • 1/2" drive and 3/8" drive
  • Sizes ranging from 8mm to 24mm
Learn more

Extension Bars

Various length extension bars help reach recessed bolts and provide clearance for the torque wrench.

  • 1/2" and 3/8" drive options
  • Various lengths
Learn more

Universal Joint

A universal joint allows for torque application at an angle, useful for hard to reach bolts.

  • 1/2" or 3/8" drive options
  • Durable construction
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

This procedure details how to properly tighten the driveshaft bolts. Always refer to manufacturer specs for specific torque values. Always use new bolts if specified.

  • Clean all mating surfaces thoroughly.
  • Install new driveshaft bolts finger tight.
  • Tighten bolts in a star pattern to the first stage torque specification.
  • Tighten the bolts to the final stage torque specification using the same star pattern.
  • Verify all bolts are torqued correctly.
View full procedure

Axle Nut Torque Procedure

This procedure details how to properly tighten the axle nuts. Always refer to manufacturer specs for specific torque values. Always use new nuts if specified.

  • Clean all mating surfaces thoroughly.
  • Install a new axle nut finger tight.
  • Tighten the axle nut to the first stage torque specification.
  • Tighten the axle nut to the final stage torque specification.
  • If required, secure the nut with a locking device such as a cotter pin or staking.
  • Verify correct torque.
View full procedure

Transmission Mount Bolt Torque Procedure

This procedure details how to properly tighten the transmission mount bolts. Always refer to manufacturer specs for specific torque values. Always use new bolts if specified.

  • Clean all mating surfaces thoroughly.
  • Install new transmission mount bolts finger tight.
  • Tighten all mount bolts to the first stage torque specification in a cross pattern.
  • Tighten all mount bolts to the final torque specification in the same cross pattern.
  • Verify correct torque.
View full procedure
Technical Service Bulletins

Vibration After Drivetrain Service

2015-06-15

Some Veranos may experience drivetrain vibrations after service due to improper torque on driveshaft bolts. Verify the torque on driveshaft bolts.

2012-2015

Resolution: Retorque all driveshaft bolts to the specified torque, replacing bolts if they have been over-torqued. Check alignment of driveshaft.

Clicking Noise From Front Axle

2016-03-22

A clicking noise from the front axle could be caused by improperly torqued axle nuts. Inspect and correct axle nut torque. Always replace nuts when removed.

2014-2016

Resolution: Replace axle nuts and torque to specification. Ensure proper installation of any locking device such as a cotter pin.

Transmission Mount Failure

2017-11-10

Premature transmission mount failures have been reported due to improper torque of transmission mount bolts. Always use a torque wrench.

2012-2017

Resolution: Replace all transmission mount bolts, tightening to the specified torque in multiple stages in a cross pattern to prevent distortion. Check the condition of the mount itself.

About the Author

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Alan Montanye - Automotive Technical Specialist
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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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