Subaru Subaru Impreza 1992-2000 Drivetrain Bolt Torque Specifications & Fastener Values
Subaru Subaru Impreza 1992-2000

Subaru Subaru Impreza 1992-2000 Drivetrain Bolt Torque Specifications

Detailed torque specifications for the drivetrain components of the 1992-2000 Subaru Impreza, 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

Flywheel

The flywheel subsystem includes the flywheel and its mounting bolts, which secure the flywheel to the crankshaft. Proper torque ensures the flywheel remains securely attached during operation, preventing misalignment or failure.

1

Flywheel Bolts

M10 x 1.25
Torque Value
61.5 ft-lbs (83 N·m)
Important Notes
Torque value is an average of the provided range (58-65 ft-lbs / 78-88 Nm).

Transmission Mounting

The transmission mounting subsystem includes bolts that secure the transmission to the chassis or engine. Proper torque ensures the transmission remains stable and aligned, preventing vibrations or misalignment that could damage the drivetrain.

1

Transmission Mounting Bolts

M10 x 1.5
Torque Value
50.5 ft-lbs (69 N·m)
Important Notes
Torque value is an average of the provided range (47-54 ft-lbs / 64-74 Nm).

Drive Axle

The drive axle subsystem includes bolts that secure the drive axles to the transmission or differential. Proper torque ensures the axles remain securely connected, preventing power loss or damage to the CV joints.

1

Drive Axle/Half Shaft Bolts

M10 x 1.25
Torque Value
50.5 ft-lbs (69 N·m)
Important Notes
Torque value is an average of the provided range (47-54 ft-lbs / 64-74 Nm).
2

CV Joint/Axle Nut

M24 x 1.5
Torque Value
144.5 ft-lbs (196 N·m)
Important Notes
Torque value is an average of the provided range (137-152 ft-lbs / 186-206 Nm).

Propeller Shaft

The propeller shaft subsystem includes bolts that secure the drive shaft to the transmission or differential. Proper torque ensures the drive shaft remains aligned and balanced, preventing vibrations or drivetrain damage.

1

Propeller/Drive Shaft Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque value is an average of the provided range (15-17 ft-lbs / 20-23 Nm).

Fluid System

The fluid system subsystem includes drain and fill plugs for the transmission, differential, and transfer case. Proper torque prevents leaks and ensures the systems operate smoothly.

1

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is an average of the provided range (29-36 ft-lbs / 39-49 Nm).
2

Differential Drain/Fill Plug

M14 x 1.5
Torque Value
39.5 ft-lbs (54 N·m)
Important Notes
Torque value is an average of the provided range (36-43 ft-lbs / 49-59 Nm).
3

Transfer Case Drain/Fill Plug

M12 x 1.5
Torque Value
32.5 ft-lbs (44 N·m)
Important Notes
Torque value is an average of the provided range (29-36 ft-lbs / 39-49 Nm).

Differential Mounting

The differential mounting subsystem includes bolts that secure the differential to the chassis or subframe. Proper torque ensures the differential remains stable and aligned, preventing drivetrain vibrations or misalignment.

1

Differential Mounting Bolts

M10 x 1.5
Torque Value
50.5 ft-lbs (69 N·m)
Important Notes
Torque value is an average of the provided range (47-54 ft-lbs / 64-74 Nm).

Transfer Case Mounting

The transfer case mounting subsystem includes bolts that secure the transfer case to the chassis or transmission. Proper torque ensures the transfer case remains stable and aligned, preventing drivetrain vibrations or misalignment.

1

Transfer Case Mounting Bolts

M10 x 1.5
Torque Value
50.5 ft-lbs (69 N·m)
Important Notes
Torque value is an average of the provided range (47-54 ft-lbs / 64-74 Nm).

Pinion Flange

The pinion flange subsystem includes bolts that secure the driveshaft to the differential pinion flange. Proper torque ensures the driveshaft remains securely connected, preventing power loss or drivetrain damage.

1

Rear Differential Pinion Flange Bolts

M12 x 1.75
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Torque value is an average of the provided range (58-72 ft-lbs / 78-98 Nm).
2

Front Differential Pinion Flange Bolts

M12 x 1.75
Torque Value
65 ft-lbs (88 N·m)
Important Notes
Torque value is an average of the provided range (58-72 ft-lbs / 78-98 Nm).

Transmission Bellhousing

The transmission bellhousing subsystem includes bolts that secure the transmission bellhousing to the engine block. Proper torque ensures the transmission remains aligned with the engine, preventing misalignment or drivetrain damage.

1

Transmission Bellhousing Bolts

M10 x 1.5
Torque Value
50.5 ft-lbs (69 N·m)
Important Notes
Torque value is an average of the provided range (47-54 ft-lbs / 64-74 Nm).

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 1992-2000 Subaru Impreza?

The torque specification for the driveshaft bolts is typically 33-40 Nm (24-30 ft-lbs). Always refer to the manufacturer's manual for your specific model and year, as variations may exist.

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 tightness and prevents component failure.

Q3

Can I reuse old bolts when reassembling the drivetrain?

It is generally not recommended to reuse old bolts, especially for critical components like the driveshaft or differential. Over time, bolts can stretch or weaken, compromising their integrity. Always use new, manufacturer-recommended bolts for reassembly.

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 a fastener such as a bolt or nut.

  • Adjustable torque settings
  • Click-type mechanism for accurate torque application
Learn more

Socket Set

A set of sockets in various sizes to fit different bolts and nuts on the drivetrain.

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

Breaker Bar

A long-handled tool used to loosen tight bolts before applying torque.

  • Extended handle for increased leverage
  • High-strength steel construction
Learn more
Service Procedures

Driveshaft Bolt Torque Procedure

Detailed steps to properly torque the driveshaft bolts on a 1992-2000 Subaru Impreza.

  • Lift the vehicle and secure it on jack stands.
  • Remove the driveshaft bolts using a socket set and breaker bar.
  • Clean the bolt threads and apply thread locker if specified.
  • Reinstall the bolts and tighten them to the specified torque using a torque wrench.
  • Double-check the torque settings and ensure all bolts are secure.
View full procedure

Transmission Mount Bolt Torque Procedure

Steps to correctly torque the transmission mount bolts to ensure proper drivetrain alignment.

  • Locate the transmission mount bolts.
  • Loosen the bolts slightly using a breaker bar.
  • Tighten the bolts in a crisscross pattern to the specified torque using a torque wrench.
  • Verify the torque settings and ensure the transmission is properly aligned.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening Issue

1998-05-15

Reports of driveshaft bolts loosening over time due to insufficient torque.

1992-1998 Subaru Impreza

Resolution: Apply thread locker and ensure bolts are torqued to the manufacturer's specifications.

Transmission Mount Bolt Failure

1999-11-20

Instances of transmission mount bolts failing due to improper torque application.

1995-2000 Subaru Impreza

Resolution: Replace failed bolts and follow the correct torque procedure during installation.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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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.
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