Cadillac CT5 2020-present 10L90 Transmission Torque Specifications
Detailed torque specifications for bolts used in the 10L90 automatic transmission found in the 2020-Present Cadillac CT5. Includes information for various case bolts, pan bolts, and other relevant fasteners.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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 securing the transmission to the vehicle frame or engine mounts.
1 Transmission Mounting Bolts
M12 x 1.75
Transmission Mounting Bolts
M12 x 1.75Torque Value
Important Notes
Oil Pan
Specifications for the bolts securing the transmission oil pan to the transmission case.
1 Transmission Oil Pan Bolts
M6 x 1.0
Transmission Oil Pan Bolts
M6 x 1.0Torque Value
Important Notes
Drain Fill Plugs
Specifications for the transmission fluid drain and fill plugs.
1 Transmission Drain and Fill Plugs
M18 x 1.5
Transmission Drain and Fill Plugs
M18 x 1.5Torque Value
Important Notes
Drive Axle
Specifications for bolts connecting the drive axles to the transmission output flange.
1 Drive Axle/Half Shaft Bolts
M10 x 1.5
Drive Axle/Half Shaft Bolts
M10 x 1.5Torque Value
Important Notes
Propeller Shaft
Specifications for the bolts securing the propeller/drive shaft to the transmission output flange.
1 Propeller/Drive Shaft Bolts
M12 x 1.75
Propeller/Drive Shaft Bolts
M12 x 1.75Torque Value
Important Notes
Bellhousing
Specifications for the bolts that connect the bellhousing to the engine block.
1 Transmission Bellhousing to Engine Bolts
M12 x 1.75
Transmission Bellhousing to Engine Bolts
M12 x 1.75Important Notes
Cooler Line Fittings
Specifications for the fittings connecting the transmission fluid cooler lines to the transmission case.
1 Transmission Fluid Cooler Line Fittings
M16 x 1.5
Transmission Fluid Cooler Line Fittings
M16 x 1.5Torque Value
Important Notes
Bellhousing Cover
Specifications for the bolts securing the inspection cover on the transmission bellhousing.
1 Transmission Bellhousing Inspection Cover Bolts
M6 x 1.0
Transmission Bellhousing Inspection Cover Bolts
M6 x 1.0Torque Value
Important Notes
Case Bolts
Specifications for the internal bolts and cap screws of the transmission case. These values are estimates.
1 Transmission Case Bolts (Small)
M6 x 1.0
Transmission Case Bolts (Small)
M6 x 1.0Torque Value
Important Notes
2 Transmission Case Bolts (Medium)
M8 x 1.25
Transmission Case Bolts (Medium)
M8 x 1.25Torque Value
Important Notes
3 Transmission Case Bolts (Large)
M10 x 1.5
Transmission Case Bolts (Large)
M10 x 1.5Torque Value
Important Notes
Output Flange Nut
Specifications for the high torque nut retaining the output flange or shaft.
1 Output Flange/Shaft Retaining Nut
M30 x 2.0
Output Flange/Shaft Retaining Nut
M30 x 2.0Torque Value
Important Notes
Tcm Mounting
Specifications for the bolts securing the TCM to the transmission case.
1 Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0
Transmission Control Module (TCM) Mounting Bolts
M6 x 1.0Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 accurate torque specifications important for the 10L90 transmission?
Why are accurate torque specifications important for the 10L90 transmission?
Accurate torque is crucial for the 10L90 transmission to ensure proper clamping force on gaskets, seals, and mating surfaces. Over-torquing can lead to component damage such as stripped threads, cracked housings, or deformed seals, causing leaks and potential transmission failure. Under-torquing can result in loose fasteners, allowing components to shift, vibrate, and also leading to leaks. Both can ultimately cause premature wear or catastrophic failure. For example, if the pan bolts are not torqued correctly, the seal may fail leading to fluid leaks and potential transmission damage due to low fluid levels.
Q2 What type of lubricant should be used on transmission bolts?
What type of lubricant should be used on transmission bolts?
Generally, most transmission bolts, especially those going into aluminum housings, require clean, dry threads. However, some bolts may specify the use of thread locker (such as Loctite) or a specific lubricant for consistent torque readings. Consult the service manual or specific torque specifications for the particular bolt in question. Using the wrong lubricant can drastically affect torque accuracy. For example, if a thread locker is specified for a valve body bolt and not used, the bolt may loosen over time leading to shift quality issues.
Q3 How often should I check the torque of transmission bolts?
How often should I check the torque of transmission bolts?
Generally, there's no need for routine torque checks on the transmission bolts once properly installed, unless a service procedure dictates otherwise. However, after any service involving the removal or loosening of bolts, such as pan removal, valve body work, or transmission removal/installation, the bolts must be re-torqued to the specified value before putting the vehicle back into service. Also, if there's suspicion that a component may have loosened, a re-torque procedure would be required.
Q4 What happens if I don't have a torque wrench?
What happens if I don't have a torque wrench?
Using a torque wrench is essential for precise torque application. While ‘hand tight’ or using a regular wrench may seem sufficient, it’s very easy to either over or under-tighten fasteners. If you do not have access to a torque wrench, it is not recommended to proceed and you should seek the assistance of a professional. Attempting to guess the torque can lead to improper clamping force which can lead to leaks, damage, and ultimately compromise the longevity of the transmission. You may get lucky one time, but risk should always be avoided with automotive systems.
Q5 Can I reuse transmission bolts?
Can I reuse transmission bolts?
Generally, transmission bolts can be reused unless they show signs of damage, stretching, or corrosion. However, some bolts are considered Torque-to-Yield (TTY) bolts, which should never be reused. These bolts are designed to stretch when torqued and must be replaced each time they are removed. Consult the service manual or the bolt specifications to determine if the bolt should be replaced. Typically, when a bolt is labeled with a torque angle, it is a TTY bolt.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 is essential for accurate tightening of transmission bolts to specified values.
- Click-type mechanism for accurate torque application
- 1/2" drive size for most transmission bolts
- Ability to measure torque in both foot-pounds (ft-lbs) and Newton-meters (Nm)
Torque Wrench (3/8" Drive)
A calibrated torque wrench is useful for smaller, hard to reach transmission components
- Click-type mechanism for accurate torque application
- 3/8" drive size for smaller transmission bolts
- Ability to measure torque in both foot-pounds (ft-lbs) and Newton-meters (Nm)
Socket Set (1/2" Drive)
A set of various sized sockets is required to fit the different bolt heads on the 10L90 transmission.
- Metric socket sizes to accommodate specific bolts
- Durable construction for repeated use
- Impact rated sockets for use with power tools
Socket Set (3/8" Drive)
A set of various sized sockets is required to fit the smaller bolt heads on the 10L90 transmission.
- Metric socket sizes to accommodate specific bolts
- Durable construction for repeated use
- Impact rated sockets for use with power tools
Extension Bars (1/2" & 3/8" Drive)
Extension bars are needed to reach recessed bolts on the transmission.
- Varying lengths to reach different areas
- Durable construction for torque application
Universal Joint (1/2" & 3/8" Drive)
A universal joint adapter provides flexibility for tightening bolts at odd angles.
- Allows torque application on angled bolts
- Durable construction for torque application
Transmission Fluid Drain Pan
A drain pan is necessary for collecting transmission fluid when servicing.
- Large capacity to contain all fluid
- Spout for easy pouring into recycling containers
Clean Lint-Free Rags
Lint-free rags for cleaning and wiping parts
- Absorbent material for cleaning transmission parts and surrounding areas
- Lint-free to prevent contamination
Service Procedures
10L90 Transmission Pan Bolt Torque Procedure
This procedure outlines the correct steps to torque the transmission pan bolts on a 10L90 transmission. Refer to the service manual for the exact bolt pattern.
- Ensure transmission is cool and vehicle is safely supported.
- Clean any dirt or debris from bolt heads and surrounding areas.
- Install all bolts by hand, ensuring they are properly threaded.
- Using a calibrated 1/2" drive torque wrench, begin tightening bolts in the specified sequence.
- Tighten all pan bolts to 20 Nm(15ft-lbs).
- Re-check all bolt torques.
10L90 Transmission Bellhousing Bolt Torque Procedure
This procedure outlines the correct steps to torque the transmission bellhousing bolts on a 10L90 transmission. Refer to the service manual for the exact bolt pattern.
- Ensure engine is supported and bellhousing surfaces are clean.
- Install bellhousing bolts by hand, ensuring proper alignment.
- Using a calibrated 1/2" drive torque wrench, tighten the bellhousing bolts to 50 Nm (37ft-lbs).
- Tighten all bellhousing bolts to the specified sequence
- Re-check all bolt torques.
10L90 Transmission Cooler Line Bolt Torque Procedure
This procedure outlines the correct steps to torque the transmission cooler line bolts on a 10L90 transmission.
- Ensure transmission is cool and vehicle is safely supported.
- Clean any dirt or debris from bolt heads and surrounding areas.
- Install all cooler line bolts by hand, ensuring they are properly threaded.
- Using a calibrated 3/8" drive torque wrench, begin tightening bolts in the specified sequence.
- Tighten cooler line bolts to 25 Nm (18ft-lbs).
- Re-check all bolt torques.
Technical Service Bulletins
10L90 Transmission Fluid Leak Diagnosis and Repair
2021-05-15This bulletin addresses potential fluid leak issues from the 10L90 transmission, focusing on pan and cooler line connections.
Resolution: Inspect transmission pan for proper torque and seal condition. Inspect cooler line fittings and bolts for proper tightness. Replace gaskets or seals if necessary.
10L90 Transmission Bolt Torque Verification
2022-08-22This bulletin is a reminder to technicians to verify all bolt torques on the 10l90 transmission after service
Resolution: Technicians are directed to check all transmission bolt torques with a calibrated torque wrench per the service manual after any service or repair to ensure proper specification.
Revised Torque Specification for 10L90 Bellhousing Bolts
2023-01-10This bulletin clarifies the torque procedure for bellhousing bolts to ensure proper seating and prevent leaks
Resolution: The correct torque procedure is to tighten bolts to 50 Nm (37 ft-lbs) in the proper sequence, then verify with a calibrated torque wrench
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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.