Dodge Caravan 1984-1990 Suspension Bolt Torque Specifications
Detailed torque specifications for all suspension bolts on the 1984-1990 Dodge Caravan (First Generation). Includes front and rear suspension components.
Important Information
Safety guidelines and reference information for proper torque application
Safety First
- Always verify torque specifications with your vehicle's factory service manual
- Use properly calibrated torque wrenches
- Replace all torque-to-yield (TTY) bolts - they are single-use only
- When in doubt, consult a professional mechanic
Quick Reference Guide
Quick Reference Guide
Common Torque Patterns
Star Pattern
Used for wheels and other circular bolt patterns
Cross Pattern
Used for gaskets and cover plates
Sequential Pattern
Used for head bolts and other critical components
Common Mistakes to Avoid
Common Mistakes to Avoid
Over-tightening
Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.
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.
Follow the manufacturer's specified torque sequence pattern.
Dirty Threads
Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.
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.
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.
Check if specs are for dry or lubricated threads. Use specified lubricant when required.
Recommended Tools
Recommended Tools
Torque Wrench (1/4" Drive)
Torque Wrench (3/8" Drive)
Torque Wrench (1/2" Drive)
Angle Gauge
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
Torque specifications for various components of the front suspension system, including struts, control arms, and steering linkages.
1 Strut-to-Steering Knuckle Bolts (Lower)
M12 x 1.75
Strut-to-Steering Knuckle Bolts (Lower)
M12 x 1.75Torque Value
Important Notes
2 Strut-to-Body Bolts (Upper)
M10 x 1.5
Strut-to-Body Bolts (Upper)
M10 x 1.5Torque Value
Important Notes
3 Sway Bar Link to Strut Bolt/Nut
M10 x 1.5
Sway Bar Link to Strut Bolt/Nut
M10 x 1.5Torque Value
Important Notes
4 Sway Bar Bracket to Frame Bolts
M8 x 1.25
Sway Bar Bracket to Frame Bolts
M8 x 1.25Torque Value
Important Notes
5 Lower Control Arm to Frame Bolts
M14 x 2.0
Lower Control Arm to Frame Bolts
M14 x 2.0Torque Value
Important Notes
6 Lower Control Arm to Ball Joint Nut
M14 x 1.5
Lower Control Arm to Ball Joint Nut
M14 x 1.5Torque Value
Important Notes
7 Tie Rod End to Steering Knuckle Nut
M12 x 1.5
Tie Rod End to Steering Knuckle Nut
M12 x 1.5Torque Value
Important Notes
8 Axle Nut
M24 x 1.5
Axle Nut
M24 x 1.5Torque Value
Important Notes
Rear Suspension
Torque specifications for components of the rear suspension system, including leaf springs, shackles, and shock absorbers.
1 Leaf Spring U-Bolts
M12 x 1.75
Leaf Spring U-Bolts
M12 x 1.75Torque Value
Important Notes
2 Shackle-to-Frame Bolts
M10 x 1.5
Shackle-to-Frame Bolts
M10 x 1.5Torque Value
Important Notes
3 Shackle-to-Leaf Spring Bolts
M10 x 1.5
Shackle-to-Leaf Spring Bolts
M10 x 1.5Torque Value
Important Notes
4 Shock Absorber Upper Bolt/Nut
M10 x 1.5
Shock Absorber Upper Bolt/Nut
M10 x 1.5Torque Value
Important Notes
5 Shock Absorber Lower Bolt/Nut
M10 x 1.5
Shock Absorber Lower Bolt/Nut
M10 x 1.5Torque Value
Important Notes
6 Rear Axle Bump Stop Mounting Bolts
M8 x 1.25
Rear Axle Bump Stop Mounting Bolts
M8 x 1.25Torque Value
Important Notes
Troubleshooting Guide
Common issues, diagnostic steps, and prevention guidelines
Common Issues
Bolt stretching, stripped threads, uneven torque patterns
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
Diagnostic Steps
Visual inspection, torque verification, thread assessment
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
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
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
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 using the correct torque specification important for suspension bolts?
Why is using the correct torque specification important for suspension bolts?
Using the correct torque ensures proper clamping force, preventing components from loosening or failing. Over-tightening can damage bolts or mounting points, while under-tightening can lead to premature wear, noise, and loss of steering control. For example, an improperly torqued control arm bolt could shift during driving, affecting alignment and potentially causing a dangerous loss of control.
Q2 Do I need to replace suspension bolts after loosening them?
Do I need to replace suspension bolts after loosening them?
While not always mandatory, it's highly recommended to replace torque-to-yield (TTY) bolts, often used in suspension systems. These bolts are designed to stretch slightly when tightened and cannot be reliably reused. If a bolt appears damaged, rusty, or corroded, it should always be replaced. Reusing a stretched or compromised bolt can lead to failure under load, causing a significant safety issue.
Q3 What is the proper way to use a torque wrench?
What is the proper way to use a torque wrench?
Always use a calibrated torque wrench and follow the manufacturer's instructions. Tighten the bolt in a smooth, controlled motion to the specified torque value. Avoid jerking the wrench. If using a click-type wrench, stop tightening immediately when you hear or feel the click. For instance, when torquing a strut bolt, you'd tighten it incrementally in a star pattern to ensure even clamping pressure. Never use a torque wrench to loosen fasteners.
Q4 Should I apply lubricant to suspension bolts before torquing them?
Should I apply lubricant to suspension bolts before torquing them?
Generally, it is recommended to torque dry fasteners unless the factory service manual specifies otherwise. Applying lubricants (such as anti-seize) to threads can drastically alter torque readings, as it reduces friction. This could lead to over-tightening of the bolt and potential damage or failure of the hardware. Always refer to the manufacturer's torque specifications as they factor in the specified thread condition.
Q5 What are common signs that my suspension bolts are loose or failing?
What are common signs that my suspension bolts are loose or failing?
Signs of loose or failing suspension bolts include clunking or rattling noises from the suspension area, especially when going over bumps, uneven tire wear, and a general feeling of looseness or play in the steering. A visible shift or movement in suspension components can also indicate loose or damaged hardware. If you notice any of these signs, immediately inspect and address the situation.
Environmental Considerations
Temperature, humidity, and seasonal effects on torque specifications
Temperature Effects
Includes: High Heat, Cold Weather, Thermal Cycling
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
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
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 inch drive)
A calibrated torque wrench is essential for applying the correct torque to suspension bolts. A 1/2 inch drive is recommended for the typical torque ranges involved.
- 10-150 ft-lb range
- Accurate calibration
Torque Wrench (3/8 inch drive)
A smaller 3/8 inch drive torque wrench is useful for lower torque specifications on smaller components.
- 5-80 ft-lb range
- Accurate calibration
Socket Set (Standard and Metric)
A comprehensive socket set with both standard and metric sizes is necessary to fit the various bolt heads found in the suspension.
- Includes common sizes such as 13mm, 15mm, 16mm, 18mm and 21mm
- Deep sockets for recessed bolts
Wrench Set (Standard and Metric)
A comprehensive wrench set is needed for holding nuts or accessing bolts where a socket may not fit.
- Includes common sizes such as 13mm, 15mm, 16mm, 18mm and 21mm
- Open end and box end wrenches
Service Procedures
Front Strut Assembly Installation
This procedure outlines the process for installing the front strut assembly, which includes specific torque requirements for the strut mounting bolts, steering knuckle bolts, and sway bar links.
- Position strut assembly into the wheel well.
- Install upper strut mounting bolts and hand-tighten.
- Install lower strut to steering knuckle bolts and hand-tighten.
- Torque the upper strut mount bolts to 20-30 ft-lbs (refer to service manual).
- Torque the lower strut to steering knuckle bolts to 80-100 ft-lbs (refer to service manual).
- Install and torque sway bar links.
- Recheck all torque specifications after a short test drive.
Rear Shock Absorber Installation
This procedure details the rear shock absorber replacement process, including torque specifications for the upper and lower mounting bolts.
- Position new shock absorber into mounting location.
- Install upper shock mounting bolts and hand-tighten.
- Install lower shock mounting bolts and hand-tighten.
- Torque upper shock mount to 20-30 ft-lbs (refer to service manual).
- Torque lower shock mount bolts to 60-80 ft-lbs (refer to service manual).
- Recheck all torque specifications after a short test drive.
Control Arm Installation
This procedure is for replacing the control arms in the suspension system, detailing proper installation and torque for the control arm bolts, and ball joint.
- Position the control arm into the chassis.
- Install the control arm mounting bolts by hand
- Install ball joint to steering knuckle bolts by hand.
- Torque control arm mounting bolts to 80-100 ft-lbs (refer to service manual).
- Torque ball joint to steering knuckle bolts to 60-70 ft-lbs (refer to service manual).
- Recheck all torque specifications after a short test drive.
Technical Service Bulletins
Front Suspension Squeak/Clunk Noise
1988-05-12Reports of squeaking or clunking noise originating from the front suspension. This may be caused by loose strut mounting bolts or worn sway bar bushings.
Resolution: Inspect and re-torque strut mounting bolts to specified torque. Check sway bar bushings for wear and replace as needed.
Rear Shock Absorber Bolt Failure
1990-02-20Reports of rear shock absorber mounting bolts shearing or loosening. This may be due to incorrect torque application or bolt fatigue.
Resolution: Inspect rear shock mounting bolts. Replace with new bolts and apply correct torque. Consider using a thread locking compound.
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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.
- 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.