RAM Ram 2500 2019-present ZF 8HP Transmission Transmission Torque Specifications & Bolt Torque Values
RAM Ram 2500 2019-present

RAM Ram 2500 2019-present ZF 8HP Transmission Torque Specifications

Detailed bolt torque specifications for the ZF-8HP transmission in 2019-Present Ram 2500 models, including torque values and tightening sequences.

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 mounting

The transmission mounting system secures the transmission to the engine or transmission crossmember, ensuring proper alignment and preventing movement or vibration that could affect transmission performance and longevity.

1

Transmission Mounting Bolts

M14 x 1.5
Torque Value
45 ft-lbs (61 N·m)
Important Notes
Estimated value, consult service manual for confirmation.

Transmission oil pan

The transmission oil pan system secures the oil pan to the transmission case, preventing oil leaks and ensuring the transmission's lubrication system functions correctly.

1

Transmission Oil Pan Bolts

M10 x 1.25
Torque Value
13.5 ft-lbs (18.3 N·m)

Transmission drain and fill

The transmission drain and fill system is used to service the transmission's fluid system. Proper torque ensures the plugs are securely tightened, preventing leaks and contamination.

1

Transmission Drain and Fill Plugs

M12 x 1.5
Torque Value
30 ft-lbs (40.7 N·m)

Transmission converter

The transmission converter system secures the torque converter to the transmission case. Tightening these bolts to the correct torque ensures proper converter alignment and prevents damage to the transmission or converter.

1

Transmission Converter Bolts

M16 x 1.5
Torque Value
65 ft-lbs (88.1 N·m)
Important Notes
Estimated value, consult service manual for confirmation.

Transmission bellhousing

The transmission bellhousing system secures the transmission bellhousing to the engine block. Proper torque ensures the bellhousing is securely attached, preventing engine and transmission misalignment.

1

Transmission Bellhousing Bolts

M14 x 1.5
Torque Value
55 ft-lbs (74.6 N·m)
Important Notes
Estimated value, consult service manual for confirmation.

Transmission crossmember

The transmission crossmember system secures the transmission crossmember to the vehicle's frame. Proper torque ensures the transmission is properly supported and aligned.

1

Transmission Crossmember Bolts

M18 x 1.5
Torque Value
75 ft-lbs (101.7 N·m)
Important Notes
Estimated value, consult service manual for confirmation.

Transmission cooler lines

The transmission cooler lines system secures the cooler lines to the transmission and cooler. Proper torque ensures the lines are leak-free and the cooler functions correctly.

1

Transmission Cooler Lines

M10 x 1.25
Torque Value
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value, consult service manual for confirmation.

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 recommended torque specification for the zf-8hp-transmission pan bolts on my 2019 Ram 2500?

The recommended torque specification for the zf-8hp-transmission pan bolts is 30 ft-lbs (40 Nm) in a star pattern. It's essential to follow this specification to ensure proper sealing and prevent leaks.

Q2

Can I use a impact wrench to tighten the transmission pan bolts?

No, it's not recommended to use an impact wrench to tighten the transmission pan bolts. The high torque output of an impact wrench can damage the threads or strip the bolts. Instead, use a torque wrench to ensure accurate and controlled tightening.

Q3

How often should I check the transmission fluid level and condition?

It's recommended to check the transmission fluid level and condition every 5,000 to 7,500 miles (8,000 to 12,000 km). Low fluid levels or contaminated fluid can cause premature wear and damage to the transmission. Always refer to your owner's manual for specific guidance.

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 high-precision torque wrench for accurate bolt torque application

  • Range: 10-150 ft-lbs
  • Accuracy: ±2%
Learn more

Socket Set

A comprehensive socket set for accessing transmission bolts

  • Sizes: 10mm, 12mm, 14mm
  • Drive type: 3/8
Learn more

Breaker Bar

A long, flexible bar for applying high torque values

  • Length: 24
  • Material: Chrome-moly steel
Learn more
Service Procedures

ZF-8HP Transmission Bolt Torque Specification

A step-by-step guide to applying the correct torque values to the ZF-8HP transmission bolts

  • Step 1: Locate the transmission bolts and ensure the area is clean and free of debris
  • Step 2: Apply the recommended torque value to each bolt in the specified sequence
  • Step 3: Double-check the torque values to ensure accuracy
View full procedure

Transmission Pan Removal and Installation

A detailed guide to removing and installing the transmission pan on the ZF-8HP transmission

  • Step 1: Raise the vehicle and remove the transmission pan bolts
  • Step 2: Carefully lower the transmission pan and remove any remaining bolts
  • Step 3: Install the new transmission pan and tighten the bolts in the specified sequence
View full procedure
Technical Service Bulletins

ZF-8HP Transmission Bolt Torque Specification Update

2020-02-15

An update to the recommended torque values for the ZF-8HP transmission bolts

2019-2022 Ram 2500

Resolution: Apply the updated torque values to the transmission bolts to ensure proper installation and prevent damage

Transmission Pan Leak Repair

2020-08-01

A repair procedure for addressing transmission pan leaks on the ZF-8HP transmission

2019-2022 Ram 2500

Resolution: Replace the transmission pan gasket and apply the recommended torque values to the transmission pan bolts

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 RAM Specs. All rights reserved.

Privacy Policy Terms of Service