Subaru Subaru WRX 2014-2021 TR580 Transmission Transmission Torque Specifications & Bolt Torque Values
Subaru Subaru WRX 2014-2021

Subaru Subaru WRX 2014-2021 TR580 Transmission Torque Specifications

Detailed torque specifications for the TR580 transmission bolts in the 2014-2021 Subaru WRX, including fastener sizes and recommended torque values.

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

This subsystem includes the components that secure the transmission to the engine mounts and transmission case.

1

Transmission Mounting Bolts

M12 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on general industry standards.
2

Transmission Mounting Bracket Bolts

M10 x 1.25
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Estimated value based on general industry standards.

Transmission case

This subsystem includes the components that secure the transmission case and bellhousing.

1

TR580 Transmission Case Bolts

M14 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on general industry standards.
2

TR580 Transmission Bellhousing Bolts

M12 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on general industry standards.

Transmission fluid system

This subsystem includes the components that secure the transmission oil pan and fluid reservoir.

1

Transmission Oil Pan Bolts

M8 x 1.25
Torque Value
10 ft-lbs (14 N·m)
Important Notes
Estimated value based on general industry standards.
2

Transmission Fluid Drain and Fill Plugs

M12 x 1.5
Torque Value
32 ft-lbs (43 N·m)
Important Notes
Estimated value based on general industry standards.

Transmission shift linkage

This subsystem includes the components that connect the transmission to the gear selector.

1

TR580 Transmission Shift Linkage Bolts

M8 x 1.25
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Estimated value based on general industry standards.

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 is the torque specification for the TR580 transmission mounting bolts on a 2014-2021 Subaru WRX?

The torque specification for the TR580 transmission mounting bolts is typically 47-52 lb-ft. Always refer to the manufacturer's service manual for your specific model and year to confirm.

Q2

What happens if the transmission bolts are over-torqued?

Over-torquing can lead to stripped threads, damaged bolt heads, or even stress cracks in the transmission housing. This can compromise the structural integrity of the transmission and lead to costly repairs.

Q3

How often should I check the torque on my transmission bolts?

It's recommended to check the torque on transmission bolts during routine maintenance or after any work involving the transmission, such as a clutch replacement or transmission service.

Q4

Can I reuse the transmission bolts?

Generally, it is safe to reuse the transmission bolts if they are in good condition and not stretched or damaged. However, for critical components, it is often recommended to replace bolts with new ones to ensure proper torque and security.

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

A precision tool for applying specific torque to bolts.

  • Adjustable torque settings
  • Calibrated for accuracy
Learn more

Socket Set

A set of sockets compatible with transmission bolts.

  • Includes metric sizes
  • Durable construction
Learn more

Thread Locker

A chemical compound to secure bolts and prevent loosening.

  • High-strength formula
  • Resistant to vibration
Learn more
Service Procedures

TR580 Transmission Bolt Torque Specification Application

Detailed steps to apply correct torque to TR580 transmission bolts.

  • Gather all necessary tools and materials, including torque wrench, socket set, and thread locker.
  • Refer to the vehicle manual for the exact torque specifications for each bolt.
  • Clean the bolt threads and apply thread locker as recommended.
  • Using the torque wrench and appropriate socket, tighten each bolt to the specified torque in a crisscross pattern.
  • Double-check the torque settings to ensure accuracy and re-tighten if necessary.
View full procedure
Technical Service Bulletins

TR580 Transmission Bolt Loosening Issue

2019-06-15

Reports of transmission bolts loosening over time, leading to potential transmission issues.

2014-2021 Subaru WRX

Resolution: Ensure bolts are torqued to the correct specification and use high-strength thread locker as a preventive measure.

TR580 Transmission Torque Specification Update

2020-03-10

Updated torque specifications for TR580 transmission bolts to improve durability.

2014-2021 Subaru WRX

Resolution: Refer to the latest service manual for updated torque values and apply them during maintenance or repairs.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

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