Buick LaCrosse 2017-2019 9T60 Transmission Transmission Torque Specifications & Bolt Torque Values
Buick LaCrosse 2017-2019

Buick LaCrosse 2017-2019 9T60 Transmission Torque Specifications

Detailed torque specifications for all bolts on the 9T60 automatic transmission used in the 2017-2019 Buick LaCrosse. Includes bellhousing, pan, valve body, and other critical fasteners.

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 Mounting

Bolts that secure the transmission case to the engine block and/or vehicle frame/subframe.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten bolts in a cross pattern to ensure even pressure.

Transmission Case

Bolts that hold the main transmission case halves together.

1

Transmission Case Bolts

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Estimated value based on typical M8 case bolts. Consult manual for specific pattern. Torque bolts in a criss-cross pattern
2

Transmission Case Bolts (Larger)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Estimated value for larger case bolts. Consult manual for specific locations and pattern. Torque bolts in a criss-cross pattern

Oil Pan

Bolts that secure the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8.83 ft-lbs (12 N·m)
Important Notes
Torque bolts in a cross pattern to prevent leaks. Do not over-tighten.

Fluid Plugs

Plugs used for servicing the transmission fluid.

1

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
27 ft-lbs (37 N·m)
Important Notes
Use new crush washers if required. Do not over-tighten.

Drive Axle

Bolts that fasten the drive axle to the transmission's output flanges.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Tighten securely to prevent driveline vibrations.

Tcm

Bolts that secure the TCM to the transmission housing.

1

Transmission Control Module (TCM) Mounting Bolts

M6 x 1.0
Torque Value
7.42 ft-lbs (10 N·m)
Important Notes
Do not over-tighten to avoid damaging the TCM.

Cooler Lines

Threaded fittings for the transmission cooler lines.

1

Transmission Cooler Line Fittings (Threaded Type)

M16 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new seals if required to prevent leaks. Do not over-tighten.

Torque Converter

Bolts that attach the torque converter to the engine's flexplate/flywheel.

1

Torque Converter Bolts

M10 x 1.5
Torque Value
48 ft-lbs (65 N·m)
Important Notes
Torque converter bolts are critical, should be tightened in a cross pattern and in sequence to spec.

Valve Body

Bolts that secure the valve body to the transmission case.

1

Valve Body Bolts

M6 x 1.0
Torque Value
7.42 ft-lbs (10 N·m)
Important Notes
Estimated value based on typical M6 bolts. Consult manual for specific pattern. Torque bolts in a criss-cross pattern.
2

Valve Body Bolts (Larger)

M6 x 1.0
Torque Value
8.83 ft-lbs (12 N·m)
Important Notes
Estimated value for larger valve body bolts. Consult manual for specific locations. Torque bolts in a criss-cross pattern.

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 precise torque specifications important for the 9T60 transmission?

Precise torque specifications are crucial for the 9T60 transmission to ensure proper component clamping force, preventing leaks, vibrations, and premature wear. Over-tightening can damage threads or distort housings, while under-tightening can lead to loosening and potential failure. Using a calibrated torque wrench is essential.

Q2

What happens if I over-torque a 9T60 transmission bolt?

Over-torquing a bolt can stretch the fastener, damage threads (in the case or bolt itself), and potentially cause the bolt head to break off. It can also distort the transmission housing or other components, leading to fluid leaks, component misalignment, and expensive repairs. For example, overtightening the pan bolts can easily warp the transmission pan causing it to leak.

Q3

Can I reuse the bolts for the 9T60 transmission?

Generally, it's recommended to replace torque-to-yield (TTY) bolts on the 9T60 transmission. These bolts are designed to stretch upon initial torquing. Reusing them might compromise their clamping force. For non-TTY bolts, inspecting for damage or elongation is important. Always refer to the service manual. If you are unsure, its best to replace.

Q4

Do I need special tools for torquing 9T60 transmission bolts?

Yes, a calibrated torque wrench is essential. It's recommended to use a click-type torque wrench for accurate settings. You may also need various socket sizes (including Torx or E-torx depending on the bolt) and potentially extensions for hard-to-reach areas. Some specific bolts might have torque-angle requirements which require the use of an angle meter.

Q5

How often should I check the torque of the 9T60 transmission bolts?

Normally, you wouldn't need to check the torque unless you have disassembled components. However, it's good practice to check any bolts you've previously torqued during a service, such as the transmission pan, after a short drive cycle and again after a few hundred miles. This is particularly important for new gaskets as they can compress and result in slightly less torque. Always follow recommended maintenance schedules.

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 between 10 Nm and 100 Nm (7 lb-ft to 74 lb-ft) accurately. 1/2" drive is recommended for most transmission bolt applications.

  • Click-type mechanism for audible confirmation
  • Accuracy within +/- 3%
  • Reversible ratchet head
Learn more

Torque Wrench (3/8" Drive)

A calibrated torque wrench capable of measuring lower torque values, typically between 5 Nm and 30 Nm (4 lb-ft to 22 lb-ft) accurately for smaller bolts and components.

  • Click-type mechanism for audible confirmation
  • Accuracy within +/- 3%
  • Reversible ratchet head
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets, including sizes commonly used for transmission components like 10mm, 13mm, 15mm, 16mm, and 18mm, etc. Includes both shallow and deep well sockets.

  • 6-point socket design for better grip
  • Chrome vanadium steel construction for durability
  • Includes common drive sizes: 1/4", 3/8" and 1/2"
Learn more

Extension Bars

Various lengths of extension bars to reach recessed bolts. Typically used with a 3/8" or 1/2" drive.

  • Various lengths for increased access
  • Durable steel construction
Learn more

Universal Joint/Swivel Adapter

A swivel adapter or universal joint to allow access to bolts in awkward positions.

  • Allows sockets to operate at an angle
  • Durable construction
Learn more
Service Procedures

9T60 Transmission Bellhousing Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the bellhousing bolts of the 9T60 transmission. Ensure the engine and transmission are stable.

  • Locate all bellhousing bolts connecting the transmission to the engine.
  • Using the appropriate socket, hand-tighten all bellhousing bolts in a star-pattern sequence.
  • Refer to the torque specifications below and use a calibrated torque wrench to tighten bolts to 50Nm (37 lb-ft).
  • Use a 10mm socket and torque the 10mm bolts to 25 Nm (18 lb-ft).
  • Using the correct torque wrench, confirm torque of all bolts per the listed specification above in a star-pattern sequence.
  • Double-check all bolts to ensure the torque is accurate.
View full procedure

9T60 Transmission Pan Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the transmission pan bolts of the 9T60 transmission.

  • Locate all transmission pan bolts.
  • Using the appropriate socket, hand-tighten all pan bolts.
  • Refer to the torque specifications and tighten the 8mm bolts to 12 Nm (106 lb-in)
  • Using the correct torque wrench, confirm torque of all bolts per the listed specification.
  • Double-check all bolts to ensure the torque is accurate.
View full procedure

9T60 Transmission Side Cover Bolt Torque Procedure

This procedure outlines the steps for correctly torquing the side cover bolts of the 9T60 transmission.

  • Locate all side cover bolts.
  • Using the appropriate socket, hand-tighten all side cover bolts.
  • Refer to the torque specifications and tighten the 10mm bolts to 25 Nm (18 lb-ft).
  • Using the correct torque wrench, confirm torque of all bolts per the listed specification.
  • Double-check all bolts to ensure the torque is accurate.
View full procedure
Technical Service Bulletins

9T60 Transmission Fluid Leak at Bellhousing Area

2018-03-15

Some 2017-2018 Buick Lacrosse vehicles with the 9T60 transmission may exhibit a fluid leak near the bellhousing area. This could be due to improper bolt torque or a faulty seal.

2017-2018 Buick Lacrosse

Resolution: Inspect bellhousing bolts for proper torque specification and replace the input shaft seal if leakage is evident.

9T60 Transmission Pan Leak

2019-05-20

Some 2018-2019 Buick Lacrosse vehicles with the 9T60 transmission may exhibit a transmission fluid leak at the transmission pan.

2018-2019 Buick Lacrosse

Resolution: Inspect transmission pan bolts for proper torque specification, replace the transmission pan gasket as necessary, and inspect pan for any defects.

9T60 Side Cover Leak

2020-01-10

Some 2017-2019 Buick Lacrosse vehicles with the 9T60 transmission may exhibit a transmission fluid leak at the side cover.

2017-2019 Buick Lacrosse

Resolution: Inspect side cover bolts for proper torque specification, replace the side cover gasket as necessary, and inspect side cover for any defects.

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Buick Specs. All rights reserved.

Privacy Policy Terms of Service