GMC Jimmy 1970-1991 Suspension Bolt Torque Specifications & Fastener Values
GMC Jimmy 1970-1991

GMC Jimmy 1970-1991 Suspension Bolt Torque Specifications

Detailed torque specifications for suspension bolts on the 1970-1991 GMC Jimmy, including upper and lower control arms, shock absorbers, and sway bar links.

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

Strut Shock Absorber

This subsystem includes bolts that secure the strut or shock absorber to the vehicle's chassis and suspension components. Proper torque ensures smooth operation and prevents loosening due to vibrations.

1

Upper Strut Mount Bolts

M10 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for suspension components.
2

Lower Shock Absorber Mounting Bolts

M12 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value based on typical M12 bolt torque for suspension components.

Control Arm Ball Joint

This subsystem includes bolts and nuts that secure the control arm and ball joint to the suspension and steering knuckle. Proper torque ensures stability, alignment, and safe steering operation.

1

Control Arm Bolts

M14 x 1.5
Important Notes
Torque sequence and angle tightening are critical for proper clamping force.
2

Ball Joint Nut

M12 x 1.25
Torque Value
75 ft-lbs (102 N·m)
Important Notes
Estimated value based on typical M12 bolt torque for suspension components.

Steering Components

This subsystem includes bolts and nuts that secure the steering linkage, tie rod ends, and steering gear/rack. Proper torque ensures precise steering control and safe operation.

1

Tie Rod End Nut

M10 x 1.25
Torque Value
40 ft-lbs (54 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for steering components.
2

Steering Gear/Rack Bolts

M14 x 1.5
Important Notes
Torque sequence and angle tightening are critical for proper clamping force.

Sway Bar Track Bar

This subsystem includes bolts and nuts that secure the sway bar links and track bar to the suspension and frame. Proper torque ensures effective body roll reduction and handling stability.

1

Sway Bar Link Nut

M10 x 1.25
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Estimated value based on typical M10 bolt torque for sway bar components.
2

Track Bar/Stabilizer Bar Mounting Bolts

M12 x 1.5
Torque Value
55 ft-lbs (75 N·m)
Important Notes
Estimated value based on typical M12 bolt torque for track bar components.

Leaf Spring U Bolts

This subsystem includes U-bolts that secure the leaf springs to the axle. Proper torque ensures suspension alignment and prevents axle shifting or spring damage.

1

Leaf Spring U-Bolts

M14 x 1.5
Important Notes
Torque sequence and angle tightening are critical for proper clamping force.

Steering Knuckle

This subsystem includes bolts that secure the steering knuckle to the suspension components. Proper torque ensures safe steering and suspension operation.

1

Steering Knuckle Bolts

M14 x 1.5
Important Notes
Torque sequence and angle tightening are critical for proper clamping force.

Wheel Lug Nuts

This subsystem includes lug nuts that secure the wheel to the hub. Proper torque ensures the wheel remains securely attached and prevents accidents due to wheel detachment.

1

Wheel Lug Nuts

M12 x 1.5
Torque Value
90 ft-lbs (122 N·m)
Important Notes
Always use a star pattern when tightening lug nuts.

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 front suspension upper control arm bolts on a 1970-1991 GMC Jimmy?

The torque specification for the front suspension upper control arm bolts is typically 55-75 ft-lbs. Always refer to the vehicle's service manual for exact specifications, as variations may exist depending on the model year and specific suspension configuration.

Q2

How often should suspension bolts be checked for proper torque?

Suspension bolts should be checked for proper torque during routine maintenance, such as every 10,000 miles or after any suspension work. Additionally, inspect them after driving on rough terrain or if you notice unusual noises or handling issues.

Q3

Can over-tightening suspension bolts cause damage?

Yes, over-tightening suspension bolts can strip threads, damage components, or lead to premature wear. Always use a calibrated torque wrench and follow the manufacturer's specifications to avoid over-tightening.

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 suspension bolts.

  • Adjustable torque settings
  • Durable construction for heavy-duty use
Learn more

Socket Set

A set of sockets in various sizes to fit suspension bolts and nuts.

  • Includes both metric and standard sizes
  • Compatible with torque wrenches
Learn more

Breaker Bar

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

  • High leverage for tough bolts
  • Durable steel construction
Learn more
Service Procedures

Front Suspension Bolt Torque Specifications

Procedure to apply the correct torque to front suspension bolts on a 1970-1991 GMC Jimmy.

  • Lift the vehicle and secure it on jack stands.
  • Remove the front wheels to access the suspension components.
  • Use a breaker bar to loosen the suspension bolts.
  • Tighten the bolts to the specified torque using a torque wrench. Refer to the manufacturer's torque specifications.
  • Reinstall the wheels and lower the vehicle.
View full procedure

Rear Suspension Bolt Torque Specifications

Procedure to apply the correct torque to rear suspension bolts on a 1970-1991 GMC Jimmy.

  • Lift the vehicle and secure it on jack stands.
  • Remove the rear wheels to access the suspension components.
  • Use a breaker bar to loosen the suspension bolts.
  • Tighten the bolts to the specified torque using a torque wrench. Refer to the manufacturer's torque specifications.
  • Reinstall the wheels and lower the vehicle.
View full procedure
Technical Service Bulletins

Suspension Bolt Torque Specification Update

1985-03-15

Updated torque specifications for suspension bolts on 1970-1991 GMC Jimmy models.

1970-1991 GMC Jimmy

Resolution: Refer to the updated torque specifications in the service manual and ensure all suspension bolts are tightened to the correct torque.

Suspension Bolt Corrosion Advisory

1988-07-22

Advisory regarding corrosion on suspension bolts for 1970-1991 GMC Jimmy models.

1970-1991 GMC Jimmy

Resolution: Inspect suspension bolts for corrosion and replace if necessary. Apply anti-seize compound to new bolts during installation.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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