Chrysler 300 2011-present 8HP70 Transmission Transmission Torque Specifications & Bolt Torque Values
Chrysler 300 2011-present

Chrysler 300 2011-present 8HP70 Transmission Torque Specifications

Comprehensive list of torque specifications for all bolts associated with the 8HP70 transmission used in 2011-Present Chrysler 300 vehicles. Includes case, pan, valve body, and other related bolt torque values.

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

Bolts securing the transmission housing to the vehicle's frame or subframe.

1

Transmission Mounting Bolts

M12 x 1.75
Torque Value
35 ft-lbs (47 N·m)
Important Notes
Ensure proper alignment of the transmission before tightening. Use a cross-tightening pattern.

Transmission Oil Pan

Bolts securing the transmission oil pan to the transmission case.

1

Transmission Oil Pan Bolts

M6 x 1.0
Torque Value
8.75 ft-lbs (12 N·m)
Important Notes
Use a cross-tightening pattern to ensure even sealing. Overtightening can damage the pan or gasket.

Transmission Drain Fill

Plugs used for draining and filling the transmission fluid.

1

Transmission Drain and Fill Plugs

M22 x 1.5
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Use a new sealing washer/gasket each time. Overtightening can damage the threads.

Drive Axle Half Shaft

Bolts securing the inner CV joint flange of the half-shaft to the transmission's output flange.

1

Drive Axle/Half Shaft Bolts

M10 x 1.5
Torque Value
70 ft-lbs (95 N·m)
Important Notes
Ensure the mating surfaces are clean. Use a cross-tightening pattern.

Transmission Bellhousing

Bolts connecting the transmission to the engine block.

1

Transmission Bell Housing Bolts

M10 x 1.5
Important Notes
Torque sequence and final torque may vary based on vehicle. Always confirm with the specific vehicle service manual. The values provided are estimated.

Transmission Valve Body

Bolts securing the valve body to the transmission case.

1

Transmission Valve Body Bolts

M6 x 1.0
Torque Value
7.5 ft-lbs (10 N·m)
Important Notes
Use a cross-tightening pattern. These bolts require precise torque to prevent leaks and ensure proper valve operation. The value provided is estimated.

Mechatronic Unit Mounting

Bolts securing the mechatronic unit to the transmission case.

1

Mechatronic Unit Mounting Bolts

M6 x 1.0
Torque Value
7.5 ft-lbs (10 N·m)
Important Notes
Use a cross-tightening pattern. These bolts require precise torque to ensure proper electrical contact and sealing. The value provided is estimated.

Output Shaft Flange

Nut or bolt securing the output shaft flange to the transmission output shaft.

1

Transmission Output Shaft Flange Nut/Bolt

M24 x 1.5
Torque Value
85 ft-lbs (115 N·m)
Important Notes
This is a critical fastening point. Ensure proper seating of the flange. Torque value estimated. May vary by vehicle.

Oil Cooler Line Fittings

Fittings for connecting the transmission to the oil cooler lines.

1

Transmission Oil Cooler Line Fittings

N/A
Torque Value
12 ft-lbs (16 N·m)
Important Notes
Torque varies depending on the specific fitting. The value provided is estimated for a typical M16 fitting. Over tightening will cause leaks and damage the fitting. Often these fittings are tightened by hand plus 1/4 turn. Please refer to the specific vehicle service manual.

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 crucial to use the correct torque specifications on 8HP70 transmission bolts?

Using incorrect torque specifications can lead to several problems. Under-torquing can cause bolts to loosen over time, resulting in leaks, component misalignment, and potential damage. Over-torquing can stretch or break bolts, strip threads in the transmission housing, or distort mating surfaces, also leading to leaks and failure. For example, over-torquing the valve body bolts could cause the valve body to crack, resulting in transmission malfunction.

Q2

What happens if I reuse torque-to-yield bolts on the 8HP70 transmission?

Torque-to-yield (TTY) bolts are designed to stretch when tightened. Reusing them compromises their strength and clamping force. They will likely not achieve the required clamping force with the correct torque, which could result in fluid leaks and component loosening. Always replace TTY bolts with new ones as specified in the service manual. Example: The Mechatronic unit bolts are typically TTY and should never be reused.

Q3

Do I need to lubricate transmission bolts before torquing them?

Generally, no. Unless the service manual specifically calls for it, do not lubricate the threads of transmission bolts. Most torque specifications assume dry threads. Lubricating them will reduce friction and can lead to over-torquing at the specified value, with possible bolt failure or damage. Always refer to the service manual for specific lubrication instructions.

Q4

What is the proper torque sequence for tightening the 8HP70 transmission pan?

The correct tightening sequence is crucial for even clamping force. Generally, tighten the pan bolts in a crisscross or star pattern, moving gradually around the pan. It's recommended to perform this in multiple passes, initially torquing to half the required value and then proceeding to the final specification. For example, if the specification is 10 Nm, tighten all the bolts to 5 Nm first, and then proceed to 10 Nm in the same pattern.

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 is essential for properly tightening fasteners to the specified torque values.

  • Measures torque in foot-pounds (ft-lbs) or Newton-meters (Nm)
  • Click-type or digital torque indication
  • Wide range of torque settings
Learn more

Torque Wrench (3/8" drive)

A calibrated torque wrench for smaller fasteners such as valve body bolts.

  • Measures torque in foot-pounds (ft-lbs) or Newton-meters (Nm)
  • Click-type or digital torque indication
  • Lower torque range than 1/2 inch drive.
Learn more

Socket Set (Metric)

A comprehensive set of metric sockets is required to fit the various bolts on the 8HP70 transmission.

  • Various sizes of sockets including 8mm, 10mm, 13mm, 16mm and 18mm
  • 6-point design for secure grip
  • Deep and standard well sockets
Learn more

Extension Bars and Swivels

Extension bars and swivels are necessary for reaching bolts in confined spaces.

  • Various lengths of extensions
  • Universal joint for angled access
  • Secure locking mechanisms
Learn more
Service Procedures

8HP70 Transmission Oil Pan Bolt Torque

Instructions for tightening the oil pan bolts to the correct torque specifications.

  • Locate all oil pan bolts.
  • Using a 10mm socket, snug all the bolts in a criss-cross pattern.
  • Set your torque wrench to 9 Nm (80 in-lbs).
  • Tighten all the bolts in a criss-cross pattern until each reaches 9 Nm (80 in-lbs).
View full procedure

8HP70 Transmission Valve Body Bolt Torque

Instructions for tightening the valve body bolts to the correct torque specifications.

  • Locate all valve body bolts.
  • Using a 8mm socket, snug all the bolts in a criss-cross pattern.
  • Set your torque wrench to 8 Nm (71 in-lbs).
  • Tighten all the bolts in a criss-cross pattern until each reaches 8 Nm (71 in-lbs).
View full procedure

8HP70 Transmission Mechatronic Unit Bolt Torque

Instructions for tightening the mechatronic unit bolts to the correct torque specifications.

  • Locate all mechatronic unit bolts.
  • Using a 8mm socket, snug all the bolts in a criss-cross pattern.
  • Set your torque wrench to 10 Nm (88 in-lbs).
  • Tighten all the bolts in a criss-cross pattern until each reaches 10 Nm (88 in-lbs).
View full procedure

8HP70 Transmission Fill Plug Torque

Instructions for tightening the fill plug to the correct torque specification.

  • Locate the fill plug on the transmission case.
  • Using the correct size socket, snug the fill plug.
  • Set your torque wrench to 35 Nm (26 ft-lbs).
  • Tighten the fill plug to 35 Nm (26 ft-lbs).
View full procedure

8HP70 Transmission Drain Plug Torque

Instructions for tightening the drain plug to the correct torque specification.

  • Locate the drain plug on the transmission case.
  • Using the correct size socket, snug the drain plug.
  • Set your torque wrench to 30 Nm (22 ft-lbs).
  • Tighten the drain plug to 30 Nm (22 ft-lbs).
View full procedure
Technical Service Bulletins

Potential for Leaks from Transmission Pan

2018-03-15

Some 8HP70 transmissions may exhibit oil leaks from the oil pan due to improper sealing or bolt torque. Proper torque is essential for preventing leaks.

2011-2018 Chrysler 300 2011-2018 Dodge Charger 2011-2018 Dodge Challenger

Resolution: Ensure the oil pan gasket is properly seated and all bolts are tightened to the correct torque specification (9 Nm/ 80 in-lbs) in a criss-cross pattern.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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