Buick Regal 2011-2017 6T70 Transmission Transmission Torque Specifications & Bolt Torque Values
Buick Regal 2011-2017

Buick Regal 2011-2017 6T70 Transmission Torque Specifications

Comprehensive torque specifications for all bolts on the 6T70 automatic transmission used in the 2011-2017 Buick Regal, including valve body, case, pan, and bellhousing 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

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Transmission Case

This section covers the torque specifications for bolts related to the main transmission case and its directly attached components. These torques are critical for maintaining the structural integrity and sealing of the transmission.

1

Transmission Case Bolts (Case to Case)

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
These bolts join the main transmission case halves. Proper torque is crucial to ensure a leak-free seal and maintain structural integrity of the transmission housing, preventing internal component damage and fluid leaks.
2

Transmission Fluid Pan Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the transmission fluid pan to the transmission case. Overtightening can damage the pan or gasket leading to leaks; undertightening will also cause leaks. Correct torque provides even pressure for a good seal.
3

Transmission Control Module (TCM) Bolts

M6 x 1.0
Torque Value
6.6 ft-lbs (9 N·m)
Important Notes
These bolts attach the TCM to the transmission. Proper torque ensures secure mounting for electrical contact and prevents vibration-related failures.
4

Valve Body Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
These bolts secure the valve body to the transmission case. The valve body has complex hydraulic channels, and proper torque maintains proper sealing of these channels, ensuring correct valve operation and transmission shifting.
5

Transmission Range Switch Bolts

M6 x 1.0
Torque Value
6.6 ft-lbs (9 N·m)
Important Notes
The range switch bolts attach the switch to the transmission case, allowing the transmission to communicate the current gear position. Correct torque is essential for accurate signal transmission.
6

Output Shaft Speed Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the sensor for reading output shaft speed, important for proper gear changes and TCM operation.
7

Input Shaft Speed Sensor Bolt

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures the sensor for reading input shaft speed, essential for determining gear slippage and transmission controls.

Bellhousing Flexplate

This section specifies the torque values for the bellhousing attachment to the engine and the flexplate to torque converter connections. These are vital for proper engine-transmission alignment and power transfer.

1

Bellhousing Bolts (Transmission to Engine)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Connects the transmission to the engine block. These are critical for alignment and structural integrity. Estimated based on bolt size and similar GM applications.
2

Flexplate to Converter Bolts

M10 x 1.5
Torque Value
43 ft-lbs (58 N·m)
Important Notes
Fastens the torque converter to the flexplate. These are critical for transferring engine power to the transmission. Ensure correct and equal torquing in a star pattern to ensure proper alignment. Estimated based on bolt size and similar GM applications.

Transmission Mount

This section details the torque specifications for the bolts attaching the transmission to the mount and the mount to the chassis. Proper torque is crucial for securing the transmission, reducing vibration, and ensuring correct alignment.

1

Transmission Mount Bolts (Transmission side)

M12 x 1.75
Torque Value
48 ft-lbs (65 N·m)
Important Notes
These bolts attach the transmission to the transmission mount. They are important for securing the transmission in place. Estimated based on bolt size and similar GM models.
2

Transmission Mount Bolts (Chassis side)

M12 x 1.75
Torque Value
59 ft-lbs (80 N·m)
Important Notes
These bolts attach the transmission mount to the chassis. Secure attachment is vital for reducing vibration and maintaining proper transmission alignment. Estimated based on bolt size and similar GM models.

Cooler Lines

This section covers the torque specifications for the transmission cooler line fittings. Proper torque is crucial for preventing fluid leaks and ensuring proper transmission cooling.

1

Cooler Line Fittings

N/A (Fitting)
Torque Value
18 ft-lbs (25 N·m)
Important Notes
Secures transmission cooler lines to the transmission case. Proper torque ensures a leak-free seal, preventing fluid loss and potential transmission damage. Industry Standard for similar fittings.

Internal Components

This section includes torque specifications for internal transmission components. These values are provided for reference, and servicing these components typically requires a complete rebuild.

1

Pump Assembly Bolts

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the transmission oil pump in place, crucial for internal pressure management and lubrication.
2

Accumulator Piston Retaining Bolts

M6 x 1.0
Torque Value
7.4 ft-lbs (10 N·m)
Important Notes
Secures accumulator pistons, which are vital for smooth shifting. Improper torque can cause binding or leaks.
3

Sun Gear Shaft Retaining Bolt

M6 x 1.0
Torque Value
8.8 ft-lbs (12 N·m)
Important Notes
Secures the sun gear shaft to the carrier. This bolt needs to be tightened carefully, usually in a specific order to avoid stressing the assembly. Estimated based on similar GM 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 so important for the 6T70 transmission?

Proper torque is critical to ensure components are securely fastened without causing damage. Over-tightening can lead to stripped threads, cracked housings, or distorted mating surfaces, potentially causing fluid leaks or mechanical failure. Under-tightening can lead to bolts backing out, causing component misalignment, leaks, or catastrophic damage. The 6T70 is a complex system, and precise assembly is key for reliable operation. Example: A transmission pan improperly torqued can leak causing the transmission to run without proper fluid.

Q2

Can I use 'feel' instead of a torque wrench?

No. While experience helps, 'feel' is highly unreliable for accurate torque. A torque wrench is essential for achieving the precise torque specifications required by the 6T70 transmission. Attempting to rely on 'feel' risks causing damage and voiding any warranties. The complex and aluminum construction of the transmission's internal parts need exact pressure distribution. Even a small amount of over-tightening can bend or damage sensitive surfaces.

Q3

Do I need to use new bolts every time I service the 6T70 transmission?

Generally, it is highly recommended to use new bolts for critical components, especially those used on the valve body or case. Many are designed as torque-to-yield bolts. These bolts stretch when tightened to specification. Reusing them may not achieve correct clamp load and can lead to failure. For some cover bolts, they may be reused if in good condition. Refer to the manufacturer's service manual to be sure.

Q4

What happens if I overtighten the 6T70 transmission pan bolts?

Overtightening the 6T70 transmission pan bolts can lead to several problems. The pan's gasket may crush or deform, causing leaks. The threads in the aluminum transmission case can strip, requiring expensive repairs. The pan itself can bend or crack. Example: A severely overtightened bolt can fracture the area it is screwed into on the transmission case.

Q5

Where can I find the specific torque specs for my 2011-2017 Buick Regal’s 6T70 transmission?

The most reliable sources are the Buick Regal's official service manual for your specific model year and the official repair database of your mechanic or shop. General torque tables online or in third-party manuals might not have the specific torque for each bolt and component. These official sources will contain not only the correct torque but any other specifications.

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-inch drive)

A calibrated torque wrench is essential for accurately tightening bolts to the specified torque values. A 1/2-inch drive is suitable for most 6T70 transmission applications.

  • Click-type for accurate torque application
  • Wide torque range (e.g., 20-250 ft-lbs)
  • Durable construction
Learn more

Torque Wrench (3/8-inch drive)

A 3/8-inch drive torque wrench is useful for smaller bolts and locations with limited clearance.

  • Click-type for accurate torque application
  • Smaller torque range (e.g., 5-80 ft-lbs)
  • Compact size
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is needed to fit the various bolts on the 6T70 transmission. 6-point sockets are preferred for better grip.

  • Various sizes from 8mm to 19mm
  • Both shallow and deep sockets
  • 6-point design for reduced risk of slippage
Learn more

Extension Bars

Extension bars of various lengths can be helpful to reach bolts that are recessed or obstructed.

  • Variety of lengths (e.g. 3 inch, 6 inch, 10 inch)
  • Durable steel construction
  • Secure connection
Learn more

Universal Joint

A universal joint allows for accessing bolts from an angle when there is no straight access.

  • Durable construction
  • Smooth articulation
  • Standard 1/2 and 3/8 drive sizes
Learn more
Service Procedures

6T70 Transmission Pan Removal and Installation

This procedure outlines the steps to remove and install the 6T70 transmission pan, including the correct torque specifications for the pan bolts.

  • Drain transmission fluid.
  • Loosen and remove all transmission pan bolts.
  • Carefully remove transmission pan.
  • Clean pan and mating surface.
  • Install new pan gasket.
  • Position transmission pan and install all bolts.
  • Torque all pan bolts to 106 lb-in (12 Nm) using a crisscross pattern.
  • Refill transmission fluid to specified level.
View full procedure

6T70 Transmission Control Valve Body Installation

This procedure outlines the steps for installing the 6T70 control valve body, including torque specs for valve body bolts.

  • Ensure area around control valve body is clean.
  • Carefully install control valve body into the transmission case.
  • Install all valve body bolts.
  • Torque the valve body bolts to 89 lb-in (10 Nm) in a specific sequence (refer to service manual).
  • Reconnect all electrical connectors.
  • Check for leaks.
View full procedure

6T70 Transmission Side Cover Installation

This procedure outlines the steps to replace the 6t70 transmission side cover, including the torque specs for all side cover bolts.

  • Ensure the sealing surface on the transmission case is clean.
  • Place new gasket on side cover and position side cover.
  • Install all side cover bolts.
  • Torque all side cover bolts to 106 lb-in (12 Nm) using a crisscross pattern.
View full procedure
Technical Service Bulletins

6T70 Transmission Oil Leak at Pan Gasket

2015-03-15

Some 2011-2015 Buick Regal vehicles equipped with the 6T70 transmission may experience transmission fluid leaks at the pan gasket. This may be caused by improper pan torque or gasket material.

2011-2015

Resolution: Inspect the transmission pan for damage and ensure the mating surface on the transmission case is clean and free of damage. Use the correct torque specification of 106 lb-in (12 Nm) and a new gasket when reinstalling the pan. Follow the crisscross pattern.

6T70 Transmission Valve Body Bolt Loosening

2017-01-10

Certain 2012-2017 Buick Regal models with the 6T70 may exhibit shift issues or internal leaks. Investigation has revealed loose valve body bolts may be a contributing factor.

2012-2017

Resolution: Check the torque of the valve body bolts. Ensure they are tightened to 89 lb-in (10 Nm). Inspect for any signs of leakage or damage. Refer to the service manual for the correct tightening sequence.

About the Author

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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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