Buick Envision 2021-present Drivetrain Bolt Torque Specifications & Fastener Values
Buick Envision 2021-present

Buick Envision 2021-present Drivetrain Bolt Torque Specifications

Detailed torque specifications for all drivetrain bolts on the 2021-Present Buick Envision, including transmission, axles, and differential 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

Engine Interface

Torque specifications for components that directly connect the engine to the drivetrain, ensuring proper power transfer and component alignment.

1

Flywheel/Flexplate Bolts

M11 x 1.25
Important Notes
Apply threadlocker. Ensure proper tightening sequence is followed (typically a star pattern).
2

Starter Motor Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure starter is properly aligned before tightening.

Transmission

Torque specifications for various bolts related to the transmission, ensuring secure mounting and fluid containment.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure transmission is properly aligned before tightening. Verify specific bolt locations on the housing.
2

Transmission Oil Pan Bolts

M6 x 1
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten in a cross pattern to prevent leaks. Use a new gasket if replacing the pan.
3

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new crush washers when installing. Do not overtighten. Ensure proper fluid level after refilling.

Axle Driveshaft

Torque specifications for fasteners securing the axle shafts, CV joints, and propeller shaft (where applicable), ensuring proper power transfer to the wheels.

1

Drive Axle/Half Shaft Bolts (Transmission Side)

M10 x 1.25
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Apply threadlocker. Ensure axle is fully seated in the flange.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
184 ft-lbs (250 N·m)
Important Notes
Use a new nut each time. Ensure proper seating of the axle in the hub and the bearing.
3

Propeller/Drive Shaft Bolts

M10 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Apply threadlocker. Ensure proper alignment and install bolts in a cross pattern.
4

Driveshaft Center Support Bearing Bolts

M8 x 1.25
Torque Value
30 ft-lbs (40 N·m)
Important Notes
Estimated value. Verify exact spec in the service manual. Ensure proper bearing alignment prior to tightening. This may not be present on all models.

Differential Transfercase

Torque specifications for components related to the differential and transfer case, ensuring proper mounting and fluid containment for these critical drivetrain components.

1

Differential Mounting Bolts

M12 x 1.75
Torque Value
60 ft-lbs (81 N·m)
Important Notes
Estimated value. Verify exact spec in the service manual. Ensure proper alignment before tightening.
2

Differential Drain/Fill Plugs

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use new crush washers when installing. Do not overtighten. Ensure proper fluid level after refilling.
3

Transfer Case Mounting Bolts

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
Estimated value. Verify exact spec in the service manual. Ensure proper alignment before tightening. This may not be present on all models.
4

Transfer Case Drain/Fill Plugs

M18 x 1.5
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Use new crush washers when installing. Do not overtighten. Ensure proper fluid level after refilling.

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 is using the correct torque specifications important for drivetrain bolts?

Using the correct torque specifications ensures proper clamping force, preventing bolts from loosening due to vibration or stress during driving. Under-torquing can lead to joint failure and component damage, while over-torquing can damage the bolts themselves or the threads in the component, leading to potential failure. For example, improper torque on the driveshaft bolts could lead to vibration and eventually separation, causing significant damage and possible loss of control.

Q2

What happens if I overtighten a drivetrain bolt?

Overtightening a bolt can stretch or weaken it, potentially leading to thread damage or the bolt breaking. It can also deform the mating surfaces of the components, leading to misalignment and premature wear. For instance, overtightening the bolts on the transmission housing could cause cracks or leaks.

Q3

Can I reuse drivetrain bolts? How can I determine if they need replacement?

While some bolts can be reused, many drivetrain bolts, especially torque-to-yield (TTY) bolts, are designed for one-time use. TTY bolts stretch when tightened and should always be replaced. Look for manufacturer recommendations and replace bolts if they are showing any signs of wear, damage, or deformation. For example, driveshaft bolts, if removed, should ideally be replaced with new ones per manufacturer guidelines, especially if they are TTY.

Q4

Do I need a special tool to torque drivetrain bolts properly?

Yes, a calibrated torque wrench is essential. Using a standard wrench and guessing is not sufficient for achieving the correct torque. A torque wrench will allow you to tighten the bolts to the specific values outlined in the service manual and ensure even clamping force. Using a non-calibrated tool may result in over or under tightening.

Q5

What should I do if I lose the torque specifications for a bolt?

Always refer to the official service manual for your specific 2021-Present Buick Envision model. Never attempt to torque a bolt without the correct specs. If you cannot find the values, consult a qualified mechanic or dealer as improper torquing of drivetrain bolts can have critical consequences.

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 capable of measuring torque values relevant to drivetrain components.

  • Click-type mechanism for accurate torque application
  • Wide torque range to accommodate various bolt sizes
  • Easy-to-read scale
Learn more

Torque Wrench (3/8" Drive)

A smaller, calibrated torque wrench for lower torque applications.

  • Click-type mechanism for accurate torque application
  • Lower torque range for smaller fasteners
  • Easy-to-read scale
Learn more

Socket Set (Metric)

A set of metric sockets of various sizes to fit drivetrain bolts and nuts.

  • Variety of sizes to accommodate different fasteners
  • Durable construction
  • 6-point or 12-point design
Learn more

Extension Bars (Various Lengths)

Extension bars to access hard-to-reach drivetrain bolts.

  • Various lengths for added reach
  • Durable construction
  • Secure connection to sockets
Learn more

Universal Joint

A universal joint adapter to access bolts at an angle.

  • Allows for angled torque application
  • Durable construction
  • Compatible with various socket sizes
Learn more
Service Procedures

Front Axle Shaft Bolt Torque Procedure

Procedure for properly torquing the bolts securing the front axle shaft to the wheel hub.

  • Locate the front axle shaft bolts.
  • Clean the bolts and mating surfaces.
  • Install the bolts finger tight.
  • Using the appropriate socket, tighten the bolts to 135 Nm.
  • Use the proper torque wrench to ensure accuracy.
  • Check torque after a short break-in period, typically 100 miles
View full procedure

Rear Drive Unit Mounting Bolt Torque Procedure

Procedure for properly torquing the bolts securing the rear drive unit to the chassis.

  • Locate the rear drive unit mounting bolts.
  • Clean the bolts and mating surfaces.
  • Install the bolts finger tight.
  • Tighten the bolts to 90 Nm using an appropriate socket
  • Using the appropriate socket, tighten the bolts an additional 60 degrees, use a torque angle meter for accuracy.
  • Check torque after a short break-in period, typically 100 miles
View full procedure

Propeller Shaft Bolt Torque Procedure

Procedure for properly torquing the bolts securing the propeller shaft to the transmission and rear drive unit.

  • Locate the propeller shaft bolts at both ends.
  • Clean the bolts and mating surfaces.
  • Install the bolts finger tight.
  • Using the appropriate socket, tighten the bolts to 70 Nm
  • Use the proper torque wrench to ensure accuracy.
  • Check torque after a short break-in period, typically 100 miles
View full procedure
Technical Service Bulletins

Driveline Vibration at Highway Speeds

2023-07-15

Some 2021-2023 Envisions may experience driveline vibrations due to improperly torqued propeller shaft bolts.

2021-2023 Buick Envision

Resolution: Inspect and re-torque all propeller shaft bolts to the specified torque. Ensure bolts are cleaned of debris and mating surfaces are inspected for damage. If vibration persists, further diagnostics may be required.

Rear Drive Unit Noise During Turning

2022-11-20

A clunking noise may be present during low speed turns in some AWD 2021-2022 Envisions due to loose rear drive unit mounting bolts.

2021-2022 Buick Envision (AWD)

Resolution: Inspect the rear drive unit mounting bolts and re-torque to the specified torque. Replace any bolts that show signs of stretching or damage. If noise persists, further diagnostics may be required.

Front Axle Clicking Sound

2023-05-03

A clicking sound may be present during low-speed turns and acceleration in some 2022-2023 Envisions due to improperly torqued front axle shaft bolts.

2022-2023 Buick Envision

Resolution: Inspect the front axle shaft bolts and re-torque to the specified torque. Ensure bolts are cleaned of debris and mating surfaces are inspected for damage. If noise persists, further diagnostics may be required.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

Automotive Technical Specialist

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