Buick Regal 1997-2004 Suspension Bolt Torque Specifications & Fastener Values
Buick Regal 1997-2004

Buick Regal 1997-2004 Suspension Bolt Torque Specifications

Detailed torque specifications for all suspension fasteners on the 1997-2004 Buick Regal, including front and rear suspension components.

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

Front Suspension

Components of the front suspension system, including struts, control arms, and sway bar.

1

Front Strut Upper Mounting Nuts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Secures the strut assembly to the vehicle body. Ensure proper alignment before tightening.
2

Front Strut Lower Mounting Bolts (to steering knuckle)

M14 x 1.5
Torque Value
103 ft-lbs (140 N·m)
Important Notes
Critical for securing the strut to the steering knuckle. Use new bolts if possible.
3

Sway Bar End Link Nuts (to Strut)

M10 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Connects the sway bar to the strut. Ensure end links are properly seated.
4

Sway Bar Bracket Bolts (to frame/subframe)

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Secures the sway bar to the vehicle frame or subframe. Tighten evenly.
5

Outer Tie Rod End Nut

M12 x 1.5
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Attaches the tie rod end to the steering knuckle. Ensure proper alignment.
6

Lower Control Arm Front Bolt (to subframe)

M14 x 2.0
Important Notes
Secures the front of the control arm to the subframe. Torque to yield bolt, replace after removal. Estimated bolt size/pitch.
7

Lower Control Arm Rear Bolt (to subframe)

M14 x 2.0
Important Notes
Secures the rear of the control arm to the subframe. Torque to yield bolt, replace after removal. Estimated bolt size/pitch.
8

Ball Joint Nut (to steering knuckle)

M12 x 1.75
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Attaches the ball joint to the steering knuckle. Ensure proper seating.

Rear Suspension

Components of the rear suspension system, including struts, trailing arms, and control arms.

1

Rear Strut Upper Mounting Nuts

M10 x 1.5
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Attaches the top of the rear strut to the body. Ensure correct orientation.
2

Rear Strut Lower Mounting Bolt (to knuckle/trailing arm)

M14 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Secures the strut to the knuckle or trailing arm. Use new bolts if possible.
3

Rear Trailing Arm Bolts (Front and Rear, Frame)

M14 x 2.0
Important Notes
Secures the trailing arm to the chassis. Torque to yield bolt, replace after removal. Estimated bolt size/pitch.
4

Rear Trailing Arm to Knuckle Bolt

M12 x 1.75
Important Notes
Secures the trailing arm to the knuckle. Torque to yield bolt, replace after removal. Estimated bolt size/pitch.
5

Rear Upper Control Arm Bolts (Frame Side)

M14 x 2.0
Important Notes
Secures the control arm to the frame. Torque to yield bolt, replace after removal. Estimated bolt size/pitch.
6

Rear Upper Control Arm Bolts (Knuckle Side)

M12 x 1.75
Important Notes
Secures the control arm to the knuckle. Torque to yield bolt, replace after removal. Estimated bolt size/pitch.
7

Rear Sway Bar End Link Nuts

M10 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Connects the rear sway bar to the suspension. Ensure end links are seated.
8

Rear Sway Bar Bracket Bolts

M10 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Secures the rear sway bar to the vehicle's frame/subframe. Tighten evenly.

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 is it important to use the correct torque specifications for suspension bolts?

Using the correct torque is crucial for safety and performance. Under-torquing can cause bolts to loosen, leading to component failure, noise, and poor handling. Over-torquing can stretch or break bolts, damage threads, or distort components, again causing failure. Correct torque ensures proper clamping force and joint integrity. Imagine a control arm bolt coming loose while driving – that's a dangerous real-world consequence of incorrect torque.

Q2

What should I do if I don't have a torque wrench?

A torque wrench is highly recommended for suspension work. If you absolutely cannot get one, you should only perform an assembly until the correct tools can be acquired and the work can be properly executed. Avoid guesswork. If you have any doubt about the correct torque, don't proceed. Seek the help of a professional mechanic. An improperly tightened suspension component is a serious safety issue, potentially causing an accident. Consider that proper torque is often about the clamping force required, not how tight you can possibly crank it down by hand.

Q3

Should I use new bolts when replacing suspension components?

Yes, it is generally recommended to use new bolts, especially for critical suspension components. Many bolts are designed to stretch slightly during tightening and may be compromised if reused. Additionally, threads can become worn over time and may not hold torque reliably. New bolts ensure proper clamping force and prevent future issues. Think of it like this: it's similar to reusing a crush washer - it often can work, but it's an avoidable point of failure.

Q4

Do I need to use thread locker on suspension bolts?

Generally, thread locker is not specified for all suspension bolts on a 1997-2004 Buick Regal. However, some bolts, especially those in areas subject to vibration, may benefit from a medium-strength (e.g., Loctite 242) thread locker. Always check the service manual or specific repair instructions for the component you are working on. Incorrect application of thread locker can make future removal difficult. For example, a sway bar end link bolt might be fine without thread locker, while a ball joint pinch bolt may specify it due to the high loads.

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 calibrated torque wrench for accurately tightening suspension fasteners.

  • 10-150 ft-lb range
  • Audible click mechanism
Learn more

Socket Set (Standard and Metric)

A comprehensive socket set to fit various suspension bolt and nut sizes.

  • 10mm - 24mm range
  • 6-point sockets for better grip
Learn more

Wrench Set (Standard and Metric)

A set of open-end and box-end wrenches for holding and tightening fasteners.

  • 8mm-22mm sizes
  • Combination wrenches
Learn more

Jack Stands

Heavy-duty jack stands to support the vehicle safely.

  • 3-ton or greater capacity
  • Adjustable height
Learn more

Vehicle Jack

Hydraulic or scissor jack for lifting the vehicle.

  • 2-ton or greater capacity
  • Stable base
Learn more
Service Procedures

Front Strut Assembly Installation

Procedure for installing the front strut assembly, including torque specifications for critical bolts.

  • 1. Support the vehicle safely on jack stands.
  • 2. Remove the wheel.
  • 3. Disconnect brake lines and ABS sensor wires (if applicable).
  • 4. Unbolt the lower strut mount.
  • 5. Unbolt the upper strut mount.
  • 6. Install the new strut assembly, ensuring correct alignment.
  • 7. Torque lower strut mount bolts to 90 ft-lbs.
  • 8. Torque upper strut mount bolts to 20 ft-lbs.
  • 9. Reconnect brake lines and ABS sensor wires.
  • 10. Reinstall wheel and lower the vehicle.
  • 11. Perform a wheel alignment
View full procedure

Rear Shock Absorber Installation

Procedure for replacing rear shock absorbers, including torque values for mounting hardware.

  • 1. Safely lift and support the vehicle with jack stands.
  • 2. Remove the wheel.
  • 3. Unbolt the lower shock mount.
  • 4. Unbolt the upper shock mount.
  • 5. Install the new shock absorber.
  • 6. Torque the lower shock mount bolt to 66 ft-lbs.
  • 7. Torque the upper shock mount bolt to 18 ft-lbs.
  • 8. Reinstall the wheel and lower the vehicle.
View full procedure

Stabilizer Bar Link Installation

Procedure for replacing sway bar end links with proper torque specifications.

  • 1. Support the vehicle on jack stands.
  • 2. Remove the wheel.
  • 3. Unbolt the stabilizer link from the sway bar and the strut.
  • 4. Install the new link.
  • 5. Torque the stabilizer link to strut bolt to 65 ft-lbs.
  • 6. Torque the stabilizer link to sway bar nut to 15 ft-lbs.
  • 7. Reinstall the wheel and lower the vehicle.
View full procedure
Technical Service Bulletins

Front Suspension Clunking Noise

2001-05-15

Report of a clunking noise originating from the front suspension on certain 1997-2002 models. Indicates a loose strut mount.

1997-2002

Resolution: Inspect and tighten upper strut mount bolts to 20 ft-lbs. Replace worn strut mounts if needed.

Rear Suspension Squeaking

2003-11-20

Reports of rear suspension squeaking on 2000-2004 models when going over bumps. Often caused by worn shock bushings.

2000-2004

Resolution: Inspect and replace rear shock absorber bushings. Ensure proper torque on shock mounting bolts.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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