Audi Audi RS4 2018-present Drivetrain Bolt Torque Specifications & Fastener Values
Audi Audi RS4 2018-present

Audi Audi RS4 2018-present Drivetrain Bolt Torque Specifications

Comprehensive listing of drivetrain bolt torque specifications for the 2018-Present Audi RS4 B9 generation, covering components such as the transmission, differential, driveshaft, and axles.

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

Torque specifications for components related to the transmission system, including mounting, fluid plugs, and internal components.

1

Transmission to Engine Mounting Bolts

M12 x 1.5 (estimated)
Important Notes
Critical bolts securing the transmission to the engine block. Estimated value based on similar Audi platform vehicles. Requires torque-to-yield procedure with new bolts.
2

Transmission Mount Bolts

M10 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Secures the transmission mount to the chassis. Estimated based on similar Audi vehicles. Use thread locker.
3

Transmission Fill Plug

M24 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Proper sealing is important to prevent fluid leaks. Estimated based on standard Audi fill plugs. Always use a new sealing washer.
4

Transmission Drain Plug

M24 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Proper sealing is crucial to prevent leaks. Estimated based on standard Audi drain plugs. Always use a new crush washer.
5

Mechatronics Unit Bolts (Valve Body)

M6 x 1.0 (estimated)
Torque Value
5.8 ft-lbs (8 N·m)
Important Notes
The mechatronics unit contains sensitive valve body components. Correct torque ensures proper internal sealing and prevents distortion. Estimated value. Requires a specific sequence for installation, which is a spiral pattern starting from the center and moving outwards.
6

Transmission Oil Pan Bolts

M6 x 1.0 (estimated)
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secures the oil pan to the transmission housing. Requires proper torque to ensure a tight seal without warping the pan. Always use a new gasket. Estimated value based on cast aluminium pans with rubber gaskets.

Front Differential

Torque specifications for components related to the front differential, including mounting, fluid plugs, and axle connections.

1

Front Differential Mounting Bolts

M12 x 1.5 (estimated)
Important Notes
These bolts secure the differential to the vehicle chassis and subframe. Estimated value based on similar Audi quattro platform front differentials. Requires torque-to-yield procedure with new bolts.
2

Front Differential Fill Plug

M20 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Prevents fluid leaks, proper seal. Estimated value based on standard Audi differential fill plugs. Always use a new sealing washer.
3

Front Differential Drain Plug

M20 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Prevents leaks and maintains the differential’s seal integrity. Estimated based on standard Audi differential drain plugs. Always use a new crush washer.
4

Axle Flange Bolts to Differential (M10)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Secures the drive axles to the differential. Estimated value based on industry standard for M10 bolts in driveline components. Use thread locker.

Rear Differential

Torque specifications for components related to the rear differential, including mounting, fluid plugs, and cover bolts.

1

Rear Differential Mounting Bolts

M12 x 1.5 (estimated)
Important Notes
Secures the rear differential to the subframe. Estimated based on similar Audi quattro platform rear differentials. Requires torque-to-yield procedure with new bolts.
2

Rear Differential Fill Plug

M20 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Maintains a proper seal and prevents fluid leaks. Estimated based on standard Audi differential fill plugs. Always use a new sealing washer.
3

Rear Differential Drain Plug

M20 x 1.5 (estimated)
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Prevents leaks. Estimated based on standard Audi differential drain plugs. Always use a new crush washer.
4

Rear Differential Cover Bolts

M8 x 1.25 (estimated)
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Secures the differential cover to the differential housing. Proper torque is required for a good seal. Estimated based on industry standard. Typically uses a new gasket or sealant.
5

Axle Flange Bolts to Differential (M10)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Secures the rear drive axles to the differential. Estimated value based on industry standard for M10 bolts in driveline components. Use thread locker.

Driveshaft

Torque specifications for components related to the driveshaft, including center support bearing and flange connections.

1

Driveshaft Center Support Bearing Bolts

M8 x 1.25 (estimated)
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Holds the center support bearing in place. Estimated value based on standard driveshaft center support bolts. Use thread locker.
2

Driveshaft Bolts to Transmission Flange (M10)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the driveshaft to the transmission output flange. Estimated based on industry standard. Use thread locker.
3

Driveshaft Bolts to Rear Differential Flange (M10)

M10 x 1.5
Torque Value
44 ft-lbs (60 N·m)
Important Notes
Connects the driveshaft to the rear differential input flange. Estimated based on industry standard. Use thread locker.

Axles Halfshafts

Torque specifications for components related to the axles and half shafts, including axle nuts and hub flange bolts.

1

Axle Nut (Front)

M24 x 1.5 (estimated)
Important Notes
A critical safety-related fastener securing the front wheel hub to the axle. Needs to be tightened with a torque angle procedure. Estimated based on industry standard. Always use a new axle nut.
2

Axle Nut (Rear)

M24 x 1.5 (estimated)
Important Notes
A critical safety-related fastener securing the rear wheel hub to the axle. Needs to be tightened with a torque angle procedure. Estimated based on industry standard. Always use a new axle nut.
3

Axle Bolts to Wheel Hub Flange (6-bolt Pattern M10)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Connects the drive axle to the wheel hub flange. Estimated based on industry standard for M10 bolts in driveline components. Use thread locker.
4

Inner CV Joint to Transmission Flange (Bolts M10)

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Connects the inner CV joint to the transmission flange. Estimated based on industry standard for M10 bolts in driveline components. Use thread locker.

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

Why are accurate torque specifications important for drivetrain bolts?

Accurate torque is crucial for proper clamping force, preventing loosening, joint failure, and premature wear. Overtightening can damage threads or the component itself, while under-tightening can lead to vibration and eventual failure. For example, if a driveshaft bolt is not torqued correctly, it can cause vibrations or even shear, leading to catastrophic failure.

Q2

Do I need to replace drivetrain bolts after removal?

In many cases, yes. Many drivetrain bolts are one-time-use, stretch bolts (torque-to-yield). These bolts deform when tightened and should always be replaced when removed to ensure proper clamping force and prevent failure. For example, axle bolts are typically torque-to-yield and should be replaced when the axle is removed.

Q3

What type of lubricant should be used on drivetrain bolts?

Generally, unless otherwise specified by Audi, no lubricant should be used on bolts. Some bolts, particularly those connecting to aluminum housings may need threadlocker (Loctite), but this will be specified in the repair manual, which should always be your primary reference. For instance, some transmission mounting bolts may use threadlocker.

Q4

Where can I find the specific torque specifications if they aren't listed here?

The primary source for accurate torque specifications is the official Audi repair manual specific to your 2018-Present RS4. The manual will provide the exact torque and tightening procedure for each bolt. Do not rely solely on this guide, which is for informational purposes only. Using generic specs is highly discouraged and could lead to damage or failure. A repair manual should always be the primary source of information for any repair.

Q5

What does 'torque-to-yield' mean?

Torque-to-yield (TTY) bolts are designed to stretch elastically when tightened, providing consistent clamping force. These bolts deform permanently during use, and their clamping force can't be reliably re-established with a second tightening; thus, they MUST be replaced after being loosened or removed. Ignoring this step can lead to bolt failure under load.

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" Drive)

A high-quality torque wrench with a range suitable for drivetrain fasteners.

  • Adjustable torque settings
  • Click-type or digital display
  • Accurate within +/- 3%
Learn more

Torque Wrench (3/8" Drive)

A smaller torque wrench for lower torque applications on drivetrain components.

  • Adjustable torque settings
  • Click-type or digital display
  • Accurate within +/- 3%
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets in various sizes needed for drivetrain bolts.

  • Variety of sizes
  • 6-point sockets for better grip
  • Durable construction
Learn more

Extension Bars

Various length extension bars to access hard-to-reach bolts.

  • Different lengths
  • Durable construction
  • Multiple drive sizes
Learn more

Universal Joint

Allows socket to be used at an angle when access is restricted.

  • Durable construction
  • Multiple drive sizes
  • Full range of motion
Learn more
Service Procedures

Front Driveshaft Bolt Torque Procedure

Procedure for torquing the bolts connecting the front driveshaft to the transmission and front differential.

  • Identify the bolts connecting the front driveshaft to the transmission flange.
  • Clean any dirt and debris from the bolts and surrounding area.
  • Use the specified socket and torque wrench to tighten the bolts to 65 Nm + 90 degrees, as per manufacturer specification.
  • Verify all bolts are torqued correctly using the same procedure.
  • Visually inspect the area for any anomalies.
View full procedure

Rear Driveshaft Bolt Torque Procedure

Procedure for torquing the bolts connecting the rear driveshaft to the transmission and rear differential.

  • Identify the bolts connecting the rear driveshaft to the transmission flange and rear differential.
  • Clean any dirt and debris from the bolts and surrounding area.
  • Use the specified socket and torque wrench to tighten the bolts to 75 Nm + 90 degrees, as per manufacturer specification.
  • Verify all bolts are torqued correctly using the same procedure.
  • Visually inspect the area for any anomalies.
View full procedure

Differential Mounting Bolt Torque Procedure

Procedure for torquing the bolts securing the front and rear differentials to the chassis.

  • Identify the bolts securing the differential to the chassis.
  • Clean any dirt and debris from the bolts and surrounding area.
  • Use the specified socket and torque wrench to tighten the bolts to 100 Nm for the front differential and 120 Nm for the rear differential, as per manufacturer specification.
  • Verify all bolts are torqued correctly using the same procedure.
  • Visually inspect the area for any anomalies.
View full procedure

Wheel Hub Bolt Torque Procedure

Procedure for torquing the bolts securing the wheel hub to the suspension assembly.

  • Identify the bolts securing the wheel hub to the suspension assembly.
  • Clean any dirt and debris from the bolts and surrounding area.
  • Use the specified socket and torque wrench to tighten the bolts to 120 Nm, as per manufacturer specification.
  • Verify all bolts are torqued correctly using the same procedure.
  • Visually inspect the area for any anomalies.
View full procedure
Technical Service Bulletins

Driveshaft Bolt Loosening

2020-05-15

Reported cases of driveshaft bolts loosening after certain mileage. Recommends careful inspection and proper torque application.

2018-2020 RS4

Resolution: Inspect driveshaft bolts at regular service intervals. Ensure proper torque to specification. Replace bolts if needed.

Differential Mounting Bolt Inspection

2021-11-20

Some differential mounting bolts have been found to stretch over time. Inspection during scheduled servicing is advised.

2018-2021 RS4

Resolution: Inspect differential mounting bolts for stretch. If stretch is found or if the bolt appears damaged, replace immediately. Ensure bolts are torqued to manufacturer specifications.

Wheel Hub Bolt Corrosion

2022-08-01

Cases of wheel hub bolt corrosion have been observed, particularly in regions with high road salt usage.

2018-2022 RS4

Resolution: During tire rotation or service work, inspect wheel hub bolts for corrosion. If corrosion is found or if the bolt appears damaged, replace immediately. Clean all areas when servicing

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

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.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Audi Specs. All rights reserved.

Privacy Policy Terms of Service