Rev Up Your Ride with 66Rfe Transmission Fluid

66Rfe Transmission Fluid

If you drive a Jeep, Dodge, or Ram equipped with an AISIN 66RFE transmission, you must know that proper maintenance is essential for running your transmission smoothly.

Regular service and replacement of 66rfe transmission fluid are essential to keep your transmission running at its best.

This article looks at what 66rfe transmission fluid is, how it functions, and its recommended service intervals.

66Rfe Transmission Fluid


66rfe Transmission Fluid Type

Fortunately, two specialized fluids work best in the 66RFE transmission – Redline C+ and ATF+4.

Redline C+ was explicitly designed for this transmission, providing superior lubrication and protection. 

Meanwhile, ATF+4 is another excellent choice for transmissions like the 66RFE. It is an improved formulation that is specifically designed as an alternative to 

66rfe Transmission Fluid and Filter Change 

To do a proper fluid and filter exchange for the 66rfe transmission, you need to take the following steps: 

  1. Raise the vehicle and place it on jack stands
  2. Drain the transmission fluid from the sump using a pan
  3. Remove the transmission pan and clean it
  4. Install new filter and gasket
  5. Refill the transmission with the correct fluid type
  6. Clean the adjacent parts and crankcase
  7. Reinstall the transmission pan
  8. Lower the vehicle

66rfe Transmission Fluid Capacity With Torque Converter

The 66rfe transmission can hold up to  7-1/2 quarts of transmission fluid, including the torque converter. 

How Much Fluid Does A 66rfe Transmission Hold

As mentioned earlier, the 66rfe transmission can hold up to  7-1/2 quarts of fluid, including the torque converter.

The transmission fluid capacity may be less than  7-1/2 quarts depending on the vehicle and model. 

How Many Quarts Of Transmission Fluid Goes In A 66rfe

The vehicle and model determine the required transmission fluid capacity for the 66rfe transmission. Generally, vehicles and models require between  7-1/2 quarts of transmission fluid. 

66rfe Transmission Fluid Check – How To

66Rfe Transmission Fluid

It is essential to routinely check the transmission fluid level to ensure smooth and reliable performance of the 66rfe transmission. To check the transmission fluid level, you need to: 

  1. Park the vehicle on a level surface and turn it off. 
  2. Lift the hood and locate the transmission dipstick
  3. Remove the dipstick and wipe it with a cloth. 
  4. Reinsert the dipstick and remove it again. 
  5. Check the fluid level. If the fluid level is low, add transmission fluid as per the vehicle’s manual specification.

66rfe Transmission Fluid Flow

The 66rfe transmission uses a rotary shift device to activate and deactivate the clutches. The pressure generated by the transmission fluid drives this shift device.

Thus, it is essential to check the fluid level and flow to ensure the proper operation of the transmission.

Read More About: A604 Fluid

66rfe Transmission Fluid Capacity Dry

The 66rfe transmission can hold up to 12 quarts of transmission fluid without the torque converter. This capacity applies to various vehicles and models. 

66rfe Transmission Fluid Temperature Sensor

The 66rfe transmission contains a temperature sensor to monitor the temperature of the transmission fluid.

The sensor helps to ensure optimal transmission performance by activating the transmission cooler when the fluid reaches a predetermined temperature.

The sensor is located near the base of the transmission and monitors the fluid temperature. 

66rfe Transmission Fluid Change Interval

Changing the transmission fluid every 50,000 miles or every three years, whichever comes first, is recommended.

Following the manufacturer’s recommended specifications is essential to prevent transmission wear and tear.

66rfe Transmission Fluid Pressure Sensor

The sensor also helps the transmission fluid flow into the valve body unrestricted, which is important to the overall performance.

Inspecting the condition of your pressure sensor is key to ensuring a seamless transmission and maximum efficiency. 

66rfe Transmission Fluid Pressure Switch

The 66rfe transmission also uses a pressure switch. It’s a three-wire switch with a red, black, and yellow wire connected to the governor.

When the pressure reaches a certain point inside the transmission, the switch triggers the governor to adjust the fluid flow rate. 

How To Drain 66rfe Transmission

Draining should always be done when the transmission is cold and should start by disconnecting the fluid line from the transmission cooler.

Next, unhook the pressure switch from the governor and unscrew the dipstick. Now, the transmission fluid will drain out of the lower transmission pan.

Ensure to properly dispose of the old fluid, since transmission fluid is hazardous waste. 

66rfe Transmission Fluid And Filters Service With Weld In Drain Plug Install

The existing plug must be removed, and the weld-in-drain plug drilled into the transmission pan to install.

Then, the filter and pan may be removed, and the gasket and gasket seal dimensions inspected for accuracy. 

What Is The Best Transmission Fluid For 66rfe? 

Synthetic fluids are usually the best choice since they’re formulated to operate at the temperatures of different transmissions.

High-quality synthetic fluids are also designed to help reduce friction and protect against wear and tear. 

What Is The Difference Between 66rfe And 68rfe?

The 66rfe transmission has an aluminum case with a seven-speed transmission, and the 68rfe has an aluminum case with an eight-speed transmission.

Both transmissions use an electronically controlled governor to help control the pressure in the system, and the latter produces a higher gear ratio for larger owners.

The Science Of Transmission Fluid And Why It’S Important For Your Vehicle

Transmission fluid is a critical component that plays a crucial role in keeping your vehicle’s engine healthy.

It serves as both a lubricant and cooling agent, ensuring that the gears within your vehicle’s transmission stay sufficiently protected throughout operation.

In this section, we explore what transmission fluid is, how its chemical composition can affect your vehicle’s performance, and the impact of low-quality transmission fluid on your engine.

Also Read: Ax5 Manual Transmission Fluid

What Is Transmission Fluid, And What Does It Do?

Transmission fluid is a specialized lubricant that enables smooth gear shifts by providing the necessary hydraulic pressure for the gears to engage and disengage correctly.

As it is also a lubricant, it plays a critical role in minimizing wear and tear within the transmission’s moving parts.

Additionally, transmission fluid acts as a coolant, dissipating heat generated during operation to prevent overheating and damage to the transmission.

Some key points about transmission fluid include:

  • Transmission fluid is usually red in color, although specific vehicles may require different colors.
  • The fluid is pumped through the metal lines within the transmission system.
  • Transmission fluid needs to be changed regularly to ensure its effectiveness and to protect the transmission.

How Does The Chemical Composition Of Transmission Fluid Affect Your Vehicle’S Performance?

The chemical composition of transmission fluid can significantly impact your vehicle’s performance.

Its primary components typically include base oils and additives, with various formulations created to achieve different performance characteristics.

The choice of transmission fluid is critical to ensure optimal vehicle performance and longevity.

Some key points about the chemical composition of transmission fluid include:

  • Different transmission fluid formulations cater to various vehicle types and driving conditions.
  • Additives such as detergents help to remove deposits and contaminants within the transmission system, prolonging its life and effectiveness.
  • Thicker transmission fluids, such as those with higher viscosity levels, can offer better protection and performance under certain driving conditions.

The Impact Of Low-Quality Transmission Fluid On Your Engine

Using low-quality transmission fluid can have a significant impact on your vehicle’s engine performance.

In particular, inadequate fluid can cause transmission parts to experience excessive wear and tear, reducing their operational lifespan and potentially leading to significant repair costs.

Some key points about the impact of low-quality transmission fluid on your engine include:

  • Inadequate transmission fluid can cause the transmission to overheat, leading to premature wear and failure.
  • Low-quality fluid often breaks down more quickly, meaning it needs to be changed more frequently to prevent damage.
  • Using the wrong type of fluid or mixing fluid types can also cause significant damage to the transmission system.

Understanding the science behind transmission fluid is essential for keeping your vehicle running smoothly.

By using the right type of fluid and changing it regularly, you can help to promote optimal transmission performance, prevent costly repairs, and ensure your vehicle remains in top condition for years to come.

66Rfe Transmission Fluid: Engineered For Optimal Performance

Your vehicle’s engine is the heart of your automobile, and the transmission is its backbone.

That is why it is essential to ensure that your vehicle’s transmission system is in top working condition.

One of the most critical components that ensure that your transmission system is functioning optimally is the transmission fluid.

In this blog post, we will explore the benefits of using 66rfe transmission fluid in your vehicle and what sets it apart from other options available in the market.

What Sets 66Rfe Transmission Fluid Apart From Other Options?

  • 66rfe transmission fluid is specifically engineered for dodge ram and jeep vehicles fitted with 66rfe transmission systems.
  • It is dodge ram’s recommended transmission fluid.
  • 66rfe transmission fluid is a synthetic blend formulated explicitly for severe operating conditions.
  • It offers superior anti-wear protection and reduces transmission shudder.
  • It meets or exceeds national lubricating grease institute’s api service classification.
  • This transmission fluid does not void your factory warranty.

The Benefits Of Using 66Rfe Transmission Fluid In Your Vehicle

Using 66rfe transmission fluid in your vehicle comes with a range of benefits that include:

  • Consistent shift performance: The fluid’s exceptional frictional properties ensure consistent shift performance in all driving conditions.
  • Improved fuel economy: The synthetic blend reduces internal friction, leading to improved fuel economy and lower emissions.
  • Improved transmission life: With superior anti-wear protection, the 66rfe transmission fluid extends your transmission system’s lifespan, reducing the need for costly repairs.
  • Reduced transmission shudder: 66rfe transmission fluid’s additives lubricate your transmission system’s moving parts, reducing transmission shudder.
  • Improved heat resistance: This transmission fluid can withstand extreme heat and cold, ensuring your vehicle’s optimal performance in all weather conditions.

Using the recommended 66rfe transmission fluid in your dodge ram or jeep vehicle is essential for maintaining optimal transmission system performance.

The fluid’s superior anti-wear protection will improve your transmission’s lifespan, and its consistent shift performance and improved heat resistance guarantee smooth operation and a comfortable driving experience.

YouTube video

How To Choose The Right 66Rfe Transmission Fluid For Your Vehicle

Understanding Your Vehicle’S Transmission System: Manual Vs Automatic

Before explaining how to choose the right 66rfe transmission fluid for your vehicle, it is essential to understand your vehicle’s transmission system.

There are two types of transmission systems:

  1. manual
  2. automatic.

Manual Transmission System

A manual transmission, also known as a stick-shift, uses a clutch pedal and gear stick to change gears.

The driver must manually shift gears to match the speed of the vehicle and prevent engine damage.

Automatic Transmission System

An automatic transmission system has a more complex setup than a manual system. The driver doesn’t have to shift gears manually because the system does it automatically. It uses a hydraulic system to detect the speed and shift gears accordingly.

The Importance Of Choosing The Right Viscosity For Your Transmission Fluid

Having an understanding of your vehicle’s transmission system is vital, but choosing the right transmission fluid viscosity is equally important.

The viscosity of transmission fluid refers to its thickness or fluidity. To maintain the health of your vehicle’s transmission system, you must choose the right viscosity.

Determine The Viscosity Recommended By The Manufacturer

The manufacturer will recommend the viscosity level suitable for your vehicle’s transmission system, and it is essential to follow these recommendations.

Choose The Viscosity Based On Temperature

Different viscosity levels are suitable for different temperatures. For instance, a thicker oil is best for hotter temperatures, while a thinner one is recommended for colder temperatures.

Tips And Tricks For Finding And Replacing Your Vehicle’S Existing Transmission Fluid With 66Rfe

Now that you understand your vehicle’s transmission system and the importance of viscosity, it’s crucial to understand how to find and replace your vehicle’s existing transmission fluid with 66rfe.

Read The Manual

The owner’s manual will detail the recommended transmission fluid and viscosity for your vehicle. Always follow this guide as different vehicles require different transmission fluids.

Check The Dipstick

Your vehicle’s dipstick is a great tool to use as it indicates the level of fluid present. If the level is low, you should top up or replace it.

Locate The Drain Pan

The drain pan is usually located under the transmission system’s housing. Drain the existing fluid and replace it with 66rfe transmission fluid of the recommended viscosity level.

Consult A Professional

If you’re unsure about the process of finding and replacing your vehicle’s transmission fluid, consult a professional mechanic. They have experience and expertise to help you with the process.

Choosing the right 66rfe transmission fluid for your vehicle is crucial to maintain its health and long life.

Remember to read the owner’s manual, determine the recommended viscosity, and consult a professional if you’re unsure of the process.

The Mechanics Of Changing Your Transmission Fluid

Why It’S Essential To Change Your Transmission Fluid Regularly

Your vehicle’s transmission fluid is responsible for lubricating the gears and other moving parts of your transmission system.

Over time, this fluid can become contaminated, and its effectiveness can be compromised.

Here are the top reasons why it’s essential to change your transmission fluid regularly:

  • Prevent costly transmission repair: Regular fluid changes can help prevent the need for expensive transmission repair due to parts wearing down or failing prematurely.
  • Improved performance: Changing your transmission fluid regularly can improve your vehicle’s overall performance by keeping the transmission system running smoothly.
  • Better fuel economy: Fresh transmission fluid helps reduce friction and heat build-up, leading to better fuel economy and a longer-lasting transmission.

The Tools And Equipment Needed To Change Your Transmission Fluid

To change your transmission fluid, you’ll need a few tools and supplies. Here’s a list of everything you’ll need to get started:

  • Transmission fluid (in this case, 66rfe transmission fluid)
  • Drain pan
  • Socket wrench set or ratchet
  • Funnel
  • New transmission filter (optional)
  • Gasket or sealant (if required)

Step-By-Step Guidance For Replacing Your Vehicle’S Existing Fluid With 66Rfe Transmission Fluid

Now that you have all the tools and equipment required for the job, it’s time to replace your old transmission fluid with 66rfe transmission fluid.

Here are the steps you need to follow:

  • Locate the drain plug: Find the drain plug on the transmission pan. It’s usually located on the bottom of the pan and can be identified by its shape and size.
  • Drain the old fluid: Place the drain pan underneath the plug and remove it. Wait until all the old fluid has drained out before replacing the plug.
  • Remove and replace the transmission filter (optional): If your vehicle has a transmission filter, remove it and replace it with a new one.
  • Add new fluid: Use a funnel to add the appropriate amount of 66rfe transmission fluid into the transmission. Consult your owner’s manual to determine how much fluid your vehicle requires.
  • Check the fluid level: Start your vehicle and let it run for a few minutes. Check the transmission fluid level with the dipstick, making sure it falls within the proper range.
  • Test drive: Take your car for a test drive to ensure that it’s shifting smoothly and that the fluid level is still within range.

By following these steps and using 66rfe transmission fluid, you can keep your transmission system running smoothly and prevent costly repairs.

Remember to change your transmission fluid regularly to keep your vehicle running efficiently.

Also Check: Ax15 Jeep Manual Transmission Fluid

Getting The Most Out Of Your 66Rfe Transmission Fluid

If you own a vehicle with a 66rfe transmission, you know that it needs proper care to perform optimally.

The transmission is responsible for converting power from the engine into the necessary force to move your vehicle.

One of the most critical parts of your transmission system is the transmission fluid that lubricates and cools its moving parts.

Proper maintenance of your vehicle’s transmission fluid is vital for the longevity and endurance of your vehicle.

We will learn about how to maintain your vehicle’s transmission for optimal performance, tips and tricks for prolonging the life of your transmission fluid, and the role of regular vehicle maintenance in keeping your transmission running smoothly.

How To Maintain Your Vehicle’S Transmission For Optimal Performance

Maintaining your vehicle’s transmission is essential if you want your vehicle to perform well and last long.

Here are a few tips on maintaining your 66rfe transmission for optimal performance.

  • Check the fluid level and condition regularly to ensure that it is clean and topped up. Low fluid levels can cause problems such as slipping gears and overheating. Refill if necessary and plan for a transmission fluid flush if it looks dirty or smells burnt.
  • Use only the recommended transmission fluid to maintain your 66rfe’s optimal performance. The manufacturer’s instructions will guide you on the right type of transmission fluid for your vehicle. Using the wrong fluid can cause serious damage.
  • Avoid aggressive driving techniques such as sudden starts, hard stops, and sharp turns. Such driving habits can add stress to your vehicle’s transmission and cause excessive wear.
  • Regularly service the transmission system as recommended by the manufacturer. A transmission system is made up of many moving parts that require regular cleaning, tightening, and replacement.

Tips And Tricks For Prolonging The Life Of Your Transmission Fluid

Your 66rfe transmission fluid is the lifeblood of your vehicle’s transmission system, and it’s essential to take good care of it.

Here are a few tips and tricks for extending the life of your transmission fluid.

  • Follow the manufacturer’s instructions on when to change the transmission fluid. Most manufacturers recommend changing the fluid every 30,000 to 60,000 miles. However, this interval may vary depending on your driving conditions, so it’s best to check with your manufacturer.
  • Avoid letting your vehicle idle for a long time, especially in hot weather, as this can cause the transmission fluid to overheat and degrade quickly.
  • Regularly check for leaks and fix them immediately. Leaks can cause the fluid levels to deplete quickly, causing issues with the transmission system.
  • Avoid towing loads beyond your vehicle’s capacity. Towing can cause excessive heat and strain on your transmission system, leading to premature wear and tear.

The Role Of Regular Vehicle Maintenance In Keeping Your Transmission Running Smoothly

Regular vehicle maintenance is an essential aspect of keeping your 66rfe transmission system healthy and running smoothly.

Neglecting regular maintenance can cause significant damage to your transmission system, leading to expensive and sometimes irreversible repairs.

Here are a few ways regular vehicle maintenance helps keep your transmission running smoothly.

  • Regularly inspect and maintain critical components such as the drive shafts, universal joints, axles, and brakes to ensure they are working correctly and not adding stress to your transmission system.
  • Regularly check your vehicle’s cooling system and keep it clean and functional. Overheating can cause severe damage to your transmission system, causing costly repairs.
  • Check your vehicle’s electrical components regularly as electrical faults in your transmission control module can cause issues such as gear slipping and hard shifting.
  • Always follow the manufacturer’s guidelines on intervals for inspection and servicing of your vehicle’s transmission system.

The 66rfe transmission fluid plays a vital role in your vehicle’s performance, and its regular maintenance is crucial for the longevity and endurance of your vehicle.

Following the manufacturer’s guidelines on maintenance intervals and adhering to proper driving habits can help prolong the life of your vehicle’s transmission system.

Remember to always check for leaks, use the recommended transmission fluid and avoid towing loads beyond your vehicle’s capacity.

Regular vehicle maintenance is an integral aspect of keeping your transmission running smoothly.

Frequently Asked Questions On 66Rfe Transmission Fluid

What Is 66Rfe Transmission Fluid?

66rfe is a type of transmission fluid used in the dodge ram 2500 and 3500 trucks with cummins diesel engines.

It is a synthetic lubricant that provides excellent protection against wear and tear, corrosion, and heat. It ensures smooth gear shifts and extends the life of the transmission components.

How Often Should I Change The 66Rfe Transmission Fluid?

The recommended interval for changing the 66rfe transmission fluid in a dodge ram truck is every 60,000 miles or 48 months, whichever comes first.

However, if you use your vehicle for heavy-duty towing or hauling, you may need to change the fluid more frequently, around every 30,000 miles or two years.

Can I Use Any Type Of Transmission Fluid In My Dodge Ram Truck?

No, you should only use the type of transmission fluid recommended by the manufacturer for your specific make and model.

Using the wrong type of fluid can damage the transmission components and lead to costly repairs.

Always refer to your owner’s manual or consult an expert if you’re unsure about the type of fluid to use.

How Do I Check The 66Rfe Transmission Fluid Level?

To check the transmission fluid level, park the vehicle on a level surface, run the engine for a few minutes, then shift the transmission through all gears and return it to park. Locate the transmission dipstick, remove it and wipe it clean.

Reinsert the dipstick, then pull it out and check the level. The level should be between the two marks on the dipstick.

Can I Change The 66Rfe Transmission Fluid Myself?

Yes, you can replace the transmission fluid in your dodge ram truck yourself if you have the right tools and know-how.

However, it’s important to follow the manufacturer’s recommendations and use the correct type of fluid.

Also, make sure to properly dispose of the old fluid and use caution when working with hot fluids and components.


Whether you’re working on a 66rfe or 68rfe transmission, properly inspecting, draining, and replacing fluid and filters is essential.

Ensuring your pressure sensors and switches function correctly is crucial for maintaining optimal performance and ensuring your transmission remains safe and reliable.

Having the right information can also help guarantee you’re using the best transmission fluid for your vehicle.

*This post contains affiliate links. That means that if you make a purchase after clicking on a link I may earn a small commission at no extra cost to you. As an Amazon Associate, I earn from qualifying purchases.” Click here for more Info.

Similar Posts