Dodge Caravan 1991-1995 Drivetrain Bolt Torque Specifications
This page provides detailed torque specifications for various drivetrain bolts on the 1991-1995 Dodge Caravan, including transmission, axle, and driveshaft components. Use these specs for proper assembly.
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
Engine Transaxle Mounting
Specifications for bolts connecting the engine to the transaxle, transmission mounts, and starter motor. Proper torque is critical for alignment, vibration control, and starter engagement.
1 Engine-to-Transaxle Bolts
M12 x 1.75
Engine-to-Transaxle Bolts
M12 x 1.75Torque Value
Important Notes
2 Transmission Mount Bolts (to Body)
M12 x 1.75
Transmission Mount Bolts (to Body)
M12 x 1.75Torque Value
Important Notes
3 Starter Motor Mounting Bolts
M10 x 1.5
Starter Motor Mounting Bolts
M10 x 1.5Torque Value
Important Notes
Transaxle Components
Torque specifications for various components of the transaxle, including case bolts, torque converter bolts, and the transmission pan.
1 Transaxle Case Bolts (General)
M8 x 1.25
Transaxle Case Bolts (General)
M8 x 1.25Torque Value
Important Notes
2 Torque Converter Mounting Bolts
M8 x 1.25
Torque Converter Mounting Bolts
M8 x 1.25Torque Value
Important Notes
3 Transaxle Pan Bolts (Automatic)
M6 x 1.0
Transaxle Pan Bolts (Automatic)
M6 x 1.0Torque Value
Important Notes
4 Transmission Mount to Transaxle Case Bolts
M12 x 1.75
Transmission Mount to Transaxle Case Bolts
M12 x 1.75Torque Value
Important Notes
Driveshaft Cvaxle
Specifications for the CV axle components, including the axle nut, inner joint flange bolts, and intermediate shaft bearing bolts.
1 CV Axle Nut (Front Wheel Hub)
M22 x 1.5
CV Axle Nut (Front Wheel Hub)
M22 x 1.5Torque Value
Important Notes
2 CV Axle Inner Joint Flange Bolts (To Transaxle)
M8 x 1.25
CV Axle Inner Joint Flange Bolts (To Transaxle)
M8 x 1.25Torque Value
Important Notes
3 Intermediate Shaft Bearing Bracket Bolts (If Applicable)
M10 x 1.5
Intermediate Shaft Bearing Bracket Bolts (If Applicable)
M10 x 1.5Torque Value
Important Notes
Differential
Specifications for the differential components. Note: the differential is most likely integrated into the transaxle on this model, but these specifications are included for completeness if a separate unit exists.
1 Differential Cover Bolts
M8 x 1.25
Differential Cover Bolts
M8 x 1.25Torque Value
Important Notes
2 Ring Gear Bolts (if accessible externally)
M12 x 1.75
Ring Gear Bolts (if accessible externally)
M12 x 1.75Torque 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 are proper torque specifications so important for drivetrain bolts?
Why are proper torque specifications so important for drivetrain bolts?
Correct torque is crucial for drivetrain reliability and safety. Under-torqued bolts can loosen over time, leading to component failure, vibrations, and potential separation. Over-torqued bolts can stretch, weaken, or even break, also causing component failure or damage to the threads in the mating surfaces. For instance, an overtightened CV axle nut can damage the wheel bearing.
Q2 What should I do if I don't have a torque wrench?
What should I do if I don't have a torque wrench?
While it's strongly recommended to use a calibrated torque wrench, if you don't have one, you should *NOT* attempt to tighten drivetrain bolts. Seek professional help, or borrow or purchase a torque wrench. Guessing or using a hand wrench is risky and can lead to serious issues. Example: Using a normal wrench on the differential bolts is a terrible idea as you wont know the torque. Using the 'German torque' method of 'gutentight' is dangerous with drivetrain components.
Q3 Can I reuse old drivetrain bolts?
Can I reuse old drivetrain bolts?
It's generally not recommended to reuse old drivetrain bolts, especially those that have been torqued to yield (TTY) or are subject to high stress. These bolts can stretch and weaken with each use, leading to potential failure. For example, it is better practice to always replace axle bolts.
Q4 How often should I inspect my drivetrain components and their bolts?
How often should I inspect my drivetrain components and their bolts?
Regular inspection is recommended, ideally every 6 months or 6,000 miles. Pay attention to leaks, unusual noises, or vibrations. Check for loose, damaged, or missing bolts. For example, during an oil change, take a minute to check the transaxle bolts for looseness or oil leaks.
Q5 What is the difference between ft-lbs and Nm?
What is the difference between ft-lbs and Nm?
Ft-lbs (foot-pounds) and Nm (Newton-meters) are units of torque. 1 ft-lb is equivalent to approximately 1.356 Nm. Always use the correct unit as specified in your service manual. Using the wrong unit for torque will result in drastically under or over tightening a bolt.
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 achieving the correct bolt torque specifications.
- Accurate torque measurement
- Click-type mechanism for precise torque application
Torque Wrench (3/8 inch drive)
A smaller torque wrench is useful for tighter spaces and smaller fasteners.
- Accurate torque measurement for smaller fasteners
- Compact size for access
Socket Set (Standard & Metric)
A comprehensive socket set is needed to fit the various sizes of bolts and nuts on the drivetrain.
- Wide range of standard and metric sizes
- Various drive sizes (3/8, 1/2 inch)
Universal Joint Adapter
A universal joint adapter allows torque to be applied at awkward angles.
- Allows socket to rotate on an axis
- Extends torque wrench reach in tight areas
Extension Bars (Various Lengths)
Extension bars extend the reach of the torque wrench to access bolts in recessed locations.
- Variety of lengths available
- Increases access without sacrificing torque application
Service Procedures
Transaxle Mounting Bolt Torque Procedure
This procedure outlines how to correctly torque the transaxle mounting bolts to the vehicle's engine and chassis.
- Clean all bolt threads and mating surfaces.
- Apply a light coating of anti-seize compound to the bolt threads.
- Install transaxle and loosely thread all mounting bolts by hand.
- Torque the transaxle bolts to 45 ft-lbs in a criss-cross pattern.
- Check the torque again after the initial torque to verify the spec.
Drive Axle Nut Torque Procedure
This procedure outlines how to correctly torque the drive axle nut to the vehicle's wheel hub.
- Clean all threads on the drive axle and wheel hub.
- Install new drive axle nut.
- While applying the brakes or a hub-locking tool, torque the drive axle nut to 150 ft-lbs.
- Stake or crimp the axle nut into the groove on the axle (if applicable)
Driveshaft Bolt Torque Procedure
This procedure outlines how to correctly torque the bolts connecting the driveshaft to the transaxle and differential.
- Clean all bolt threads and mating surfaces.
- Apply a light coating of anti-seize compound to the bolt threads.
- Install the driveshaft and loosely thread all connecting bolts.
- Torque driveshaft bolts to 30 ft-lbs in a criss-cross pattern.
- Check the torque again after the initial torque to verify the spec.
Differential Cover Bolt Torque Procedure
This procedure outlines how to correctly torque the differential cover bolts to the differential housing.
- Clean all bolt threads and mating surfaces.
- Install new differential gasket or RTV sealant
- Install the differential cover and loosely thread all bolts by hand.
- Torque the differential cover bolts to 20 ft-lbs in a criss-cross pattern.
- Check the torque again after the initial torque to verify the spec.
Technical Service Bulletins
Transaxle Mounting Bolt Loosening Issue
1994-03-15Reports of transaxle mounting bolts loosening after initial torque. This may result in excessive vibration or noise.
Resolution: Apply a medium-strength threadlocker to the transaxle bolts and re-torque to 45 ft-lbs. Check torque regularly during maintenance periods.
Drive Axle Nut Retorque Recommendation
1993-11-20Drive axle nuts are prone to loosening over time, particularly after any type of suspension or front end work. It's important to check the torque on the nuts to prevent failure.
Resolution: Re-torque axle nuts to 150 ft-lbs after 50-100 miles of driving after axle replacement or any front end work. Stake or crimp the axle nut into the groove on the axle (if applicable).
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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.
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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.