Ford C4 C6 Transmission Identification: A Complete Guide For You!

If you’re a car enthusiast, you know that the Ford C4 and C6 transmissions are some of the most iconic and enduring automatic transmissions in automotive history. 

These transmissions have been around since the early 1960s and have gained popularity for their efficiency and versatility. 

In this article, we will provide you with a complete guide to Ford C4 C6 Transmission Identification. 

We will delve into all the basic information about these transmissions over the years, including how to recognize and understand their unique aspects. 

You will learn about the gear ratios of the C4 and C6, how long they are, and where they were made. 

So, buckle up and let’s take a ride through the history of these legendary transmissions!

What Is The History Of Ford C4 C6 Transmission Identification?

The history of Ford C4 and C6 transmission identification is rooted in the evolution of automatic transmissions within the Ford Motor Company. Let’s take a journey through the key milestones and developments in the identification of Ford C4 and C6 transmissions:

Introduction of Automatic Transmissions

The need for automatic transmissions grew in the automotive industry as customers sought more convenience and ease of driving.

Ford introduced automatic transmissions in the 1950s, with early models like the Ford-O-Matic.

Birth of the C4 Transmission

The C4 transmission was introduced in 1964 as a lightweight and compact automatic transmission.

Initially designed for smaller and less powerful vehicles, the C4 gained popularity due to its simplicity and efficiency.

Distinctive Features of the C4

The C4 transmission featured a unique bellhousing design, a square-shaped pan with 11 bolts, and a generally smaller size compared to its counterparts.

C6 Transmission Enters the Scene

In 1966, Ford introduced the C6 transmission as a heavier-duty option capable of handling higher horsepower and torque.

The C6 was designed for larger vehicles, trucks, and high-performance applications.

Physical Characteristics and Identification

As the C4 and C6 transmissions evolved, specific physical characteristics such as bellhousing design, pan shape, and fluid capacity became key identifiers.

Identification tags with codes and casting numbers on the transmission cases were introduced to provide detailed information about each unit.

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Technological Advancements

Over the years, both transmissions underwent technological advancements and improvements in materials and design.

These advancements aimed to enhance durability, fuel efficiency, and overall performance.

Vehicle Applications

The C4 and C6 transmissions were strategically used in different vehicle applications based on their design and performance capabilities.

The C4 remained popular in smaller cars, while the C6 found its place in larger vehicles and high-powered applications.

Transmission Codes and VIN Identification

Ford implemented specific transmission codes that could be found on the identification tag or stamped on the transmission case.

Vehicle Identification Numbers (VINs) also began to include information about the original transmission type, aiding in easier identification.

Ongoing Evolution

Both the C4 and C6 transmissions continued to evolve through the decades, with updates and modifications introduced to meet changing automotive demands.

Aftermarket and Enthusiast Community

The aftermarket industry and enthusiast community played a significant role in documenting, preserving, and sharing knowledge about C4 and C6 transmissions.

Identification guides, forums, and resources became valuable tools for enthusiasts and those involved in transmission-related activities.

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Ford C4 and C6 Transmissions

Physical Characteristics

• Bellhousing: The C4 and C6 transmissions have distinctive bellhousing shapes. The C4 features a more compact bellhousing, while the C6 has a larger, bulkier design.
• Pan Shape and Size: Examine the transmission pan. The C4 typically has a square-shaped pan with 11 bolts, whereas the C6 has a rectangular pan with 17 bolts.
• Pan Magnet: The C6 often has a magnet in the pan, while the C4 may not have one. Checking for the presence of a magnet during maintenance can aid in identification.
• Overall Size and Weight: The C6 is generally larger and heavier than the C4, making it visually distinguishable. Pay attention to the size and weight when assessing the transmission.

Identification Codes

• Tag on the Transmission: Look for a metal identification tag on the transmission. This tag will have codes that indicate the transmission type, manufacturing date, and other relevant information.
• Casting Numbers: Locate the casting numbers on the transmission case. These numbers can help identify the specific model and any modifications that may have been made over the years.
• VIN Identification: Check the Vehicle Identification Number (VIN) on the vehicle’s dashboard or driver’s side door. The VIN may provide information about the original transmission type.

Performance and Applications

• Horsepower Ratings: The C6 is generally designed for higher horsepower applications compared to the C4. Consider the vehicle’s power requirements when identifying the transmission.
• Application in Vehicles: Understand the typical vehicles each transmission model was used in. The C4 is often found in smaller cars, while the C6 is commonly used in larger vehicles, trucks, and high-performance applications.
• Year of Manufacture: Both transmissions have gone through various updates and modifications over the years. Knowing the specific model year characteristics can aid in accurate identification.

Maintenance and Upgrades

• Fluid Capacity: The C6 typically has a higher fluid capacity than the C4. Understanding the fluid requirements can help with maintenance and fluid changes.
• Torque Converter Compatibility: Consider the torque converter compatibility when performing upgrades or replacements. Ensure that the torque converter is suitable for the specific transmission model.

How can you tell a C4 from a C6 transmission?

Distinguishing between a Ford C4 and C6 transmission involves examining various physical characteristics and identification methods. 

Here’s a concise guide to help you tell a C4 from a C6 transmission:

Bellhousing Design

• C4: The C4 transmission has a more compact bellhousing with a generally smaller and lighter appearance.
• C6: The C6 transmission features a larger and bulkier bellhousing compared to the C4.

Transmission Pan

• C4: The C4 typically has a square-shaped transmission pan with 11 bolts.
• C6: The C6 has a rectangular transmission pan with 17 bolts. Additionally, the pan on a C6 may have a magnet for catching metal particles.

Identification Tag

• C4 and C6: Check for a metal identification tag attached to the transmission. The tag contains codes providing information about the transmission type, manufacturing date, and other relevant details.

Casting Numbers

• C4 and C6: Locate the casting numbers on the transmission case. These numbers can be used to identify the specific model and any modifications made during production.

Fluid Capacity

• C4: Generally has a lower fluid capacity compared to the C6.
• C6: Has a higher fluid capacity due to its larger size.

Vehicle Applications

• C4: Often found in smaller cars and vehicles with lower horsepower requirements.
• C6: Commonly used in larger vehicles, trucks, and high-performance applications due to its ability to handle higher horsepower.

Overall Size and Weight

• C4: Smaller and lighter compared to the C6.
• C6: Larger and heavier, providing increased durability for higher horsepower applications.

Torque Converter Compatibility

• C4 and C6: When performing upgrades or replacements, consider the torque converter compatibility. Ensure that the torque converter is suitable for the specific transmission model.

Vehicle VIN

• C4 and C6: Check the Vehicle Identification Number (VIN) on the dashboard or driver’s side door. The VIN may provide information about the original transmission type installed in the vehicle.

What is the name of the transmission in the Ford C6?

The name of the transmission in the Ford C6 is SelectShift Cruise-O-Matic. The Ford C6 is a heavy-duty automatic transmission built by Ford Motor Company between 1966 and 2004. 

Compared to its predecessor MX transmission, the C6 offered lower weight, less complexity, less parasitic power loss, and greater torque capacity for larger engines. 

It was marketed as the “SelectShift” because if the transmission was placed in first or second gear, the transmission would use only the gear selected, whether from a standing stop or in motion. 

This was very helpful when driving in limited traction situations, where the torque of the engine would gradually move the vehicle, or if engine braking was needed on a downward incline. Once the transmission was placed in third, all three gears would be used in a normal fashion.

What are the common problems with Ford C6 transmission?

The Ford C6 transmission is a heavy-duty automatic transmission that has been around since 1966. 

While it is known for its durability and strength, there are some common problems that can arise with this transmission. 

According to a Ford expert at DIY Ford, some of the most common problems include:

• Low fluid level: This can cause the transmission to overheat and lead to other problems.
• Torque converter and/or front pump cavitated: This means there is no fluid or air in the fluid, which can cause the transmission to fail.
• Torque converter improperly installed: This can cause the torque converter to make noise and lead to other problems.
• Manual shift linkage between car and transmission improperly adjusted: This can cause the transmission to not shift properly.

What vehicles have E4OD transmission?

The Ford E4OD transmission was introduced in 1989 and was Ford’s first electronically controlled transmission. It was used in many light and heavy-duty vehicles, including the Ford Bronco, F-150, F-250, and F-350. 

While it was too large for most passenger cars, it is still a popular upgrade for older trucks and larger vehicles that were originally equipped with a 3-speed automatic. 

The E4OD was produced in several different bolt patterns, including small block, big block (385 series, not FE), diesel, and modular bolt patterns. 

The E4OD was replaced by the 4R100 in 1997, which was internally stronger for use in Powerstroke Diesel trucks. Vehicles from 1997 could be found with either transmission.

C4 Vs C6 Transmission Dimensions

The Ford C4 and C6 transmissions are similar in operational characteristics, but there are still unique differences between the two transmissions. 

The C4 is a medium-duty transmission that weighs 130 lbs dry w/ torque converter and has an aluminum case. 

The C6, on the other hand, is a heavy-duty transmission that can handle much more load. It weighs 175 lbs dry w/ converter and also has an aluminum case. 

The C4 is approximately 30.5 inches long overall and 19.75 inches from the front of the bell to the mount. 

The C6 is approximately 34.5 inches long overall and 22.75 inches from the front of the bell to the mount.

FAQs

What is the gear ratio of the C4 transmission? 

The Ford C4 transmission typically came with three different gear ratio configurations. These C4 gear ratios are as follows:

• First Gear (1st): The first gear ratio in the C4 transmission is generally around 2.46:1 or 2.40:1. This gear provides strong initial torque and is used for starting the vehicle from a standstill.
• Second Gear (2nd): The second gear ratio is typically around 1.46:1. It strikes balances of acceleration and speed. It is also used during moderate driving conditions.
• Third Gear (3rd): The third gear ratio is usually 1.00:1. It offers a direct drive, meaning there is no torque multiplication. This gear is used for high-speed cruising and efficient fuel consumption. Some variants of this popular transmission body may have slightly different gear ratios. However, the above ratios are common for standard C4 transmissions.

What is the gear ratio of the C6 transmission? 

The Ford C6 transmission typically came with three different gear ratio configurations. These C6 gear ratios are as follows:

• First Gear (1st): The first gear ratio in the C6 transmission is generally around 2.46:1 or 2.72:1. This gear provides strong initial torque and is used for starting the vehicle from a standstill.
• Second Gear (2nd): The second gear ratio is typically around 1.46:1. It strikes balances of acceleration and speed. It is also used during moderate driving conditions.
• Third Gear (3rd): The third gear ratio is usually 1.00:1. It offers a direct drive, meaning there is no torque multiplication. This gear is used for high-speed cruising and efficient fuel consumption. 

What is the difference between the C4 and C6 torque converters? 

The C4 and C6 torque converters are different in size and design. The C4 torque converter is smaller and has a diameter of approximately 11 inches . The C6 torque converter, on the other hand, is larger and has a diameter of approximately 13 inches . The C6 torque converter is also heavier and has a higher stall speed than the C4 torque converter.

What is the difference between the C4 and C6 bellhousings? 

The C4 and C6 bellhousings are different in size and design. The C4 bellhousing is smaller and has a diameter of approximately 16.5 inches. The C6 bellhousing, on the other hand, is larger and has a diameter of approximately 17.5 inches. The C6 bellhousing is also heavier and has a different bolt pattern than the C4 bellhousing.

What is the difference between the C4 and C6 input shafts? 

The C4 and C6 input shafts are different in size and design. The C4 input shaft is smaller and has a diameter of approximately 1 inch. The C6 input shaft, on the other hand, is larger and has a diameter of approximately 1.375 inches. The C6 input shaft is also longer than the C4 input shaft.

What is the difference between the C4 and C6 valve bodies? 

The C4 and C6 valve bodies are different in size and design. The C4 valve body is smaller and has fewer valves than the C6 valve body. The C6 valve body, on the other hand, is larger and has more valves than the C4 valve body. The C6 valve body is also heavier and has a different bolt pattern than the C4 valve body.

Conclusion

We hope that this guide has provided you with a comprehensive understanding of Ford C4 C6 Transmission Identification. 

We have covered the basics of these iconic transmissions, including their history, gear ratios, dimensions, and common problems. 

We also answered some frequently asked questions about these transmissions. 

Whether you’re a car enthusiast or just curious about the inner workings of your vehicle, we hope that this guide has been informative and helpful. 

If you have any further questions or concerns, don’t hesitate to reach out to a professional mechanic. 

Thank you for reading!