Buick Cascada 2016-2019 6T45 Transmission Transmission Torque Specifications & Bolt Torque Values
Buick Cascada 2016-2019

Buick Cascada 2016-2019 6T45 Transmission Torque Specifications

Detailed torque specifications for all bolts related to the 6T45 automatic transmission in the 2016-2019 Buick Cascada, including pan bolts, valve body bolts, and transmission case 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

Transmission Mounting

These specifications apply to bolts that secure the transmission to the engine block or vehicle frame.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even clamping force. Always use new bolts if specified.

Transmission Oil Pan

These specifications apply to bolts that secure the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a crisscross pattern. Always use a new gasket.

Transmission Plugs

These specifications apply to the transmission drain and fill plugs.

1

Transmission Drain/Fill Plugs

M18 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Always use new gaskets or seals with drain and fill plugs.

Drive Axle

These specifications apply to bolts that secure the drive axle/half shaft to the transmission output flange.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
52 ft-lbs (70 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even clamping force. Use new bolts if specified.

Cooler Lines

These specifications apply to the fittings where transmission cooler lines attach to the transmission case.

1

Transmission Cooler Line Fittings

M16 x 1.5
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Use new sealing washers or O-rings. Be very careful to ensure proper thread engagement to avoid cross-threading.

Trs Sensor

These specifications apply to bolts that secure the transmission range sensor to the transmission case.

1

Transmission Range Sensor (TRS) Mounting Bolts

M5 x 0.8
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Do not overtighten as damage to sensor or threads could occur.

Valve Body

These specifications apply to bolts that secure the valve body to the transmission case.

1

Valve Body Mounting Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Tighten bolts in a crisscross pattern to ensure even clamping force to prevent leaks.

Tcm

These specifications apply to bolts that secure the TCM to the transmission case when it is externally mounted.

1

Transmission Control Module (TCM) Mounting Bolts

M5 x 0.8
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Ensure proper grounding. Do not overtighten.

Bell Housing

These specifications apply to bolts that secure the bell housing to the transmission case if the bell housing is removable.

1

Transmission Bell Housing Bolts

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten bolts in a crisscross pattern. Ensure dowel pins are properly aligned.

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 specification so important for the 6T45 transmission?

Using the correct torque specification is crucial to prevent damage to the transmission components. Over-tightening can strip threads or crack castings, leading to leaks and component failure. Under-tightening can cause bolts to loosen during operation, potentially resulting in fluid leaks, vibrations, and eventually major damage to the transmission. Proper torque ensures that all fasteners are clamped securely, maintaining the integrity of the transmission assembly.

Q2

What happens if I don't have a torque wrench for the 6T45 transmission bolts?

While it's possible to tighten bolts without a torque wrench, it is highly discouraged for the 6T45 transmission. Guessing or over-tightening fasteners can lead to serious problems. It is essential to acquire a torque wrench for accurate tightening of these fasteners. If a torque wrench isn't immediately available, it is recommended to postpone the work until you do have one. Some auto parts stores loan them, or you can purchase an entry level torque wrench.

Q3

Do I need to replace the bolts every time I work on the 6T45 transmission?

While not always required, it's generally recommended to replace certain bolts on the 6T45 transmission, especially those that are torque-to-yield or stretch bolts. These bolts are designed to stretch slightly when torqued, providing optimal clamping force. Reusing them might result in improper clamping and potential failures. Always consult the repair manual to know if a specific bolt needs to be replaced, such as the oil pan bolts.

Q4

Are the torque specs for the 6T45 transmission different for aluminum and steel components?

Yes, torque specifications can vary based on the materials being fastened. Aluminum components, being softer, often require lower torque values to prevent stripping threads. For instance, when attaching the transmission case to an aluminum housing, be sure to use the correct torque for aluminum. Ensure you are referencing the correct specification for each bolt location and material type in your repair procedure.

Q5

What should I do if I accidentally over-torque a bolt on the 6T45 transmission?

If you over-torque a bolt, especially on an aluminum part, the best course of action is to immediately remove the bolt and inspect both the bolt and the threads in the component it was attached to. If the threads are stripped or the bolt shows signs of damage such as stretching, they must be replaced. Over-torquing can also weaken parts leading to failure in the future. It's best to re-torque with a new bolt to the correct specification after verifying no further damage has been done.

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)

Used to apply precise torque to fasteners. A 1/2" drive is recommended for the torque ranges on the 6T45 transmission.

  • Accurate torque measurement
  • Click-type or digital display
Learn more

Torque Wrench (3/8" drive)

Used for smaller bolts and tighter spaces where a 1/2" drive may not fit. Typically has a lower torque range.

  • Lower torque application
  • Compact size
Learn more

Socket Set (Metric)

A complete metric socket set is necessary for the various bolt head sizes on the 6T45 transmission.

  • Various sizes
  • 6-point sockets
Learn more

Extension Bars

Used to reach recessed fasteners or apply torque in hard-to-reach areas of the transmission.

  • Various lengths
  • Durable construction
Learn more

Universal Joint

Allows the socket to pivot, enabling access to fasteners at angles.

  • Flexible angle
  • Secure socket connection
Learn more
Service Procedures

6T45 Transmission Pan Removal and Installation

Procedure for removing and installing the transmission pan, including torque specifications for pan bolts.

  • Drain transmission fluid.
  • Remove transmission pan bolts.
  • Carefully remove the transmission pan.
  • Clean the pan and sealing surfaces.
  • Install new gasket/seal on transmission pan.
  • Position the pan and hand-tighten all bolts.
  • Torque all pan bolts to 10 Nm (89 lb-in) in a criss-cross pattern.
  • Refill the transmission fluid to the correct level.
View full procedure

6T45 Transmission Control Valve Body Installation

Procedure for installing the transmission control valve body, including torque specifications for valve body bolts.

  • Disconnect the battery negative terminal.
  • Remove the transmission pan and filter.
  • Disconnect the valve body wiring harness.
  • Remove valve body bolts.
  • Carefully remove the valve body.
  • Install new valve body gasket.
  • Carefully install the valve body and hand tighten bolts.
  • Torque valve body bolts to 10 Nm (89 lb-in) in a specified sequence.
  • Reconnect the valve body wiring harness.
  • Install the transmission filter and pan.
  • Refill the transmission fluid to the correct level.
  • Reconnect the battery negative terminal.
View full procedure

6T45 Transmission Fluid Drain Plug Installation

Procedure for installing the transmission fluid drain plug with correct torque.

  • Install the drain plug with a new washer.
  • Hand tighten the drain plug.
  • Torque the drain plug to 25 Nm (18 lb-ft).
View full procedure
Technical Service Bulletins

PIP5286: 6T40/6T45 Transmission Fluid Leak From Pan Area

2016-01-22

This bulletin addresses a potential transmission fluid leak in the pan area due to incorrect sealing or deformed pan flanges.

2012-2017 Buick Cascada

Resolution: Inspect the transmission pan for deformation, replace gasket with a revised design, and ensure all bolts are torqued to the correct specification. Replace pan if needed.

PIP5300: 6T40/6T45 Transmission Harsh Shift/Slip After Fluid Change

2017-03-15

This bulletin addresses potential transmission shifting issues that occur post-fluid change that are potentially due to the wrong fluid type being installed.

2012-2019 Buick Cascada

Resolution: Verify the use of Dexron VI transmission fluid. Flush and refill the transmission if the incorrect fluid was used. Inspect for any debris in the transmission fluid.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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