Cadillac CTS 2008-2013 6L90 Transmission Transmission Torque Specifications & Bolt Torque Values
Cadillac CTS 2008-2013

Cadillac CTS 2008-2013 6L90 Transmission Torque Specifications

Detailed torque specifications for all bolts on the 6L90 automatic transmission used in the 2008-2013 Cadillac CTS. Includes case, pan, valve body, and bellhousing bolt torques.

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 pertain to the bolts that secure the transmission to the vehicle's frame or crossmember.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
58 ft-lbs (78 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening. Use a cross-tightening pattern to ensure even pressure.

Transmission Oil Pan

These specifications are for the bolts securing the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
106 in-lbs (12 N·m)
Important Notes
Use a new gasket when reinstalling the pan. Tighten in a cross-tightening pattern to ensure even sealing. Do not overtighten.

Transmission Drain Fill Plugs

These specifications apply to the transmission fluid drain and fill plugs.

1

Transmission Drain and Fill Plugs

M18 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Use a new sealing washer on drain plug. Do not overtighten.

Drive Axle Half Shaft

These specifications are for the bolts that connect the drive axles/half shafts to the transmission output shaft flanges.

1

Drive Axle/Half Shaft Bolts

M12 x 1.75
Torque Value
118 ft-lbs (160 N·m)
Important Notes
Ensure the axle flanges are properly aligned before tightening. Tighten bolts in a cross pattern for even clamping force.

Transmission Bellhousing

These specifications are for the bolts that secure the transmission to the engine block.

1

Transmission Bellhousing Bolts (M10)

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Ensure proper alignment of the transmission to the engine block. Tighten bolts in a cross pattern to ensure even pressure.
2

Transmission Bellhousing Bolts (M12)

M12 x 1.75
Torque Value
74 ft-lbs (100 N·m)
Important Notes
Ensure proper alignment of the transmission to the engine block. Tighten bolts in a cross pattern to ensure even pressure.

Torque Converter

These specifications are for the bolts that attach the torque converter to the engine's flexplate/flywheel.

1

Torque Converter Bolts

M10 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Tighten the torque converter bolts evenly in a cross-tightening pattern. Improper torque can cause imbalance and damage.

Transmission Cooler Lines

These specifications are for the fittings that connect the transmission cooler lines to the transmission case.

1

Transmission Cooler Line Fittings

M16 x 1.5
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Do not overtighten these fittings, as they can strip easily. Ensure a proper seal to prevent leaks.

Transmission Case

These specifications are for the bolts that hold the transmission case halves together.

1

Transmission Case Bolts (M8)

M8 x 1.25
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Tighten evenly. Use a criss-cross pattern to avoid warping the case halves.
2

Transmission Case Bolts (M10)

M10 x 1.5
Torque Value
26 ft-lbs (35 N·m)
Important Notes
Tighten evenly. Use a criss-cross pattern to avoid warping the case halves.
3

Transmission Case Bolts (M12)

M12 x 1.75
Torque Value
37 ft-lbs (50 N·m)
Important Notes
Tighten evenly. Use a criss-cross pattern to avoid warping the case halves.

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

What happens if I overtighten the transmission pan bolts?

Overtightening the transmission pan bolts can lead to several issues. Primarily, it can crush or deform the pan gasket, causing leaks. The bolt threads within the transmission case can also be stripped, requiring more extensive and costly repairs such as heli-coil inserts or case replacement. This often manifests as a slow leak after you've completed the job.

Q2

Can I reuse the 6L90 transmission pan gasket?

It is generally recommended *not* to reuse the 6L90 transmission pan gasket. While some gaskets may appear to be in good condition, they can lose their sealing properties after being compressed. Reusing a gasket increases the risk of leaks and the need to redo the job. Always install a new gasket to ensure proper sealing.

Q3

Do the bolt torque specifications apply to both steel and aluminum transmission pans?

Yes, the specified torque values for the 6L90 transmission generally apply to both steel and aluminum pans. However, it's important to ensure that your vehicle's year, make, and model match the specifications that you are referencing. If aftermarket pans are installed, then verify their specific torque specifications as they may vary from the OEM parameters. When using an aluminum pan, it may be especially important to follow torque recommendations.

Q4

How often should I check my transmission fluid level on a 2008-2013 Cadillac CTS with a 6L90 transmission?

Transmission fluid level checks should be performed as part of your regular maintenance schedule, which is generally every 30,000-60,000 miles or as recommended by your vehicle's owner's manual. However, you should check if you suspect leaks or after significant service. On this 6L90 transmission, you will need to check the fluid via the fill plug and not an actual dipstick.

Q5

What type of transmission fluid should I use in my 6L90 transmission?

The 6L90 transmission typically uses GM DEXRON VI transmission fluid. Using a fluid that does not meet GM specifications can lead to transmission damage, reduced performance, and shortened lifespan. Always consult your owner's manual and ensure you use the correct fluid for your vehicle. Using aftermarket fluids that say they meet the specification can also lead to damage.

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.

  • 1/2 inch drive for common bolt sizes
  • Click type or digital readout
  • Accuracy of +/- 3%
Learn more

Torque Wrench (3/8 inch drive)

A calibrated torque wrench is needed for smaller bolts and less torque.

  • 3/8 inch drive for smaller bolts
  • Click type or digital readout
  • Accuracy of +/- 3%
Learn more

Socket Set (Metric)

A set of metric sockets is necessary for removing and installing the transmission bolts. Common sizes for the 6L90 include 10mm, 13mm, 15mm, and 18mm.

  • Variety of metric sizes
  • 6-point sockets preferred
  • Deep well sockets for hard to reach bolts
Learn more

Extension Bars (various lengths)

Extension bars are needed to access hard-to-reach bolts in the transmission assembly.

  • 1/2 inch drive and 3/8 drive
  • Varying lengths for different access points
  • Durable construction
Learn more
Service Procedures

Transmission Pan Bolt Torque Procedure

Proper tightening of the transmission pan bolts is crucial to prevent leaks. These bolts should be tightened in a specific sequence and torque to ensure even pressure on the pan gasket.

  • Clean the pan mating surface on the transmission and pan.
  • Install a new gasket on the pan.
  • Install the pan and lightly tighten bolts by hand in a criss-cross pattern.
  • Torque pan bolts to 12 Nm (106 lb-in) using a criss-cross pattern.
  • Double check torque value.
View full procedure

Transmission Bellhousing Bolt Torque Procedure

The bellhousing bolts attach the transmission to the engine. They require proper torque to ensure proper alignment and prevent vibration or damage.

  • Clean the mating surfaces of the bellhousing and engine block.
  • Position the transmission against the engine block and install bellhousing bolts by hand.
  • Tighten bellhousing bolts to 55 Nm (41 lb-ft) in a criss-cross pattern.
  • Double check torque value.
View full procedure

Transmission Filter Bolt Torque Procedure

The transmission filter is held in place with a bolt or bolts. These bolts need to be properly torqued to secure the filter and prevent oil leaks.

  • Install the new transmission filter in its correct location.
  • Install filter retaining bolt and tighten by hand.
  • Torque the filter bolt to 12 Nm (106 lb-in)
  • Double check torque value.
View full procedure

Transmission Valve Body Bolt Torque Procedure

The valve body bolts are to be torqued to proper specifications to prevent pressure leaks.

  • Clean the valve body and transmission mating surface.
  • Install the valve body and lightly tighten bolts by hand.
  • Torque the valve body bolts to 10 Nm (89 lb-in) in a criss-cross pattern.
  • Double check torque value.
View full procedure
Technical Service Bulletins

Service Bulletin: Transmission Fluid Leakage at Pan

2010-05-15

Some 2008-2010 Cadillac CTS vehicles equipped with the 6L90 transmission may experience fluid leakage at the transmission pan. This may be due to incorrect pan bolt torque or damaged gasket.

2008-2010 Cadillac CTS with 6L90 transmission

Resolution: Replace transmission pan gasket and ensure proper pan bolt torque to 12 Nm (106 lb-in) in a criss-cross pattern. Inspect pan for flatness before installation.

Service Bulletin: Transmission Shifting Issues

2012-08-22

Some 2011-2013 Cadillac CTS vehicles equipped with the 6L90 transmission may experience irregular shifting. This can be caused by low fluid, improper valve body torquing, or internal transmission damage.

2011-2013 Cadillac CTS with 6L90 transmission

Resolution: Check fluid level and quality. If level is low or fluid is burnt, replace fluid. Inspect valve body bolts for correct torque of 10 Nm (89 lb-in). If shifting issues persist, internal transmission repairs may be necessary.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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