Subaru Subaru Legacy 2005-2009 Drivetrain Bolt Torque Specifications & Fastener Values
Subaru Subaru Legacy 2005-2009

Subaru Subaru Legacy 2005-2009 Drivetrain Bolt Torque Specifications

Detailed torque specifications for the drivetrain components of the 2005-2009 Subaru Legacy, including transmission, driveshaft, and differential 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

Engine Transmission Interface

Components that connect the engine to the transmission, ensuring proper alignment and power transfer.

1

Flywheel Bolts

M10 x 1.25
Torque Value
57.5 ft-lbs (78 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the flywheel before tightening.
2

Crankshaft Pulley/Harmonic Balancer Bolt

M12 x 1.5
Torque Value
97.5 ft-lbs (132 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a holding tool to prevent crankshaft rotation during tightening.
3

Transmission Bellhousing Bolts

M10 x 1.25
Torque Value
39.5 ft-lbs (53.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the transmission before tightening.

Transmission Assembly

Components that secure the transmission and its associated parts, ensuring stability and proper fluid retention.

1

Transmission Mounting Bolts

M8 x 1.25
Torque Value
39.5 ft-lbs (53.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the transmission before tightening.
2

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
6.5 ft-lbs (8.8 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a torque wrench calibrated for low torque values.
3

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a new crush washer for each plug.
4

Transmission Crossmember Bolts

M10 x 1.25
Torque Value
52.5 ft-lbs (71 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the crossmember before tightening.

Driveline Components

Components that transfer power from the transmission to the wheels, ensuring smooth operation and alignment.

1

Drive Axle/Half Shaft Bolts

M8 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the axles before tightening.
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
166.5 ft-lbs (226 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a holding tool to prevent wheel rotation during tightening.
3

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the drive shaft before tightening.

Differential And Transfer Case

Components that manage power distribution to the wheels, ensuring proper fluid retention and alignment.

1

Differential Drain/Fill Plug

M12 x 1.5
Torque Value
39.5 ft-lbs (53.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a new crush washer for each plug.
2

Transfer Case Drain/Fill Plug

M12 x 1.5
Torque Value
39.5 ft-lbs (53.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a new crush washer for each plug.
3

Differential Mounting Bolts

M10 x 1.25
Torque Value
52.5 ft-lbs (71 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the differential before tightening.
4

Transfer Case Mounting Bolts

M8 x 1.25
Torque Value
39.5 ft-lbs (53.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Ensure proper alignment of the transfer case before tightening.
5

Differential Cover Bolts

M6 x 1.0
Torque Value
21 ft-lbs (28.5 N·m)
Important Notes
Torque value is the midpoint of the provided range. Use a new gasket and ensure proper alignment of the cover.

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 driveshaft bolts on a 2005-2009 Subaru Legacy?

The driveshaft bolts on a 2005-2009 Subaru Legacy should be torqued to 32-38 Nm (24-28 ft-lbs). Ensure the bolts are clean and free of debris before tightening, and use a calibrated torque wrench for accuracy.

Q2

How often should I check the torque on drivetrain components?

It is recommended to check the torque on drivetrain components, such as driveshaft bolts and differential mounting bolts, every 30,000 miles or after any major service involving the drivetrain. This ensures proper alignment and prevents loosening due to vibration.

Q3

Can I reuse the drivetrain bolts, or should I replace them?

Drivetrain bolts, such as those for the driveshaft or differential, are typically reusable unless they show signs of wear, corrosion, or stretching. However, Subaru recommends replacing critical fasteners, like axle nuts, as they are designed for one-time use to ensure proper clamping force.

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 used to apply a specific torque to bolts and nuts.

  • Adjustable torque settings
  • Calibrated for accuracy
Learn more

Socket Set

A set of sockets in various sizes to fit drivetrain bolts.

  • Includes both metric and standard sizes
  • Durable construction
Learn more

Thread Locker

A chemical compound used to secure bolts and prevent loosening.

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

Driveshaft Bolt Torque Specification

Procedure to properly torque the driveshaft bolts on a 2005-2009 Subaru Legacy.

  • Lift the vehicle and secure it on jack stands.
  • Locate the driveshaft bolts at the transmission and differential connections.
  • Clean the bolt threads and apply thread locker if specified.
  • Tighten the bolts to the specified torque using a torque wrench.
  • Double-check the torque settings and ensure all bolts are secure.
View full procedure

Rear Differential Mount Bolt Torque Specification

Procedure to torque the rear differential mount bolts.

  • Raise the vehicle and support it safely.
  • Locate the rear differential mount bolts.
  • Clean the bolt threads and apply thread locker if required.
  • Tighten the bolts to the manufacturer's specified torque.
  • Verify the torque settings and ensure proper alignment.
View full procedure
Technical Service Bulletins

Drivetrain Bolt Loosening Issue

2007-05-15

Some 2005-2007 Subaru Legacy models may experience drivetrain bolt loosening due to vibration.

2005-2007 Subaru Legacy

Resolution: Inspect and retorque all drivetrain bolts to the specified values. Apply thread locker if necessary.

Driveshaft Bolt Corrosion

2008-11-20

Driveshaft bolts on 2005-2009 Subaru Legacy models may corrode over time, leading to improper torque retention.

2005-2009 Subaru Legacy

Resolution: Replace corroded bolts with new, coated bolts and torque to specifications. Apply anti-corrosion treatment if needed.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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