A Comprehensive Guide to Jeep Transfer Case Fluid Types and Maintenance

Understanding Jeep Transfer Case Fluid Types

Transfer case fluid is essential for the proper functioning of your vehicle’s drivetrain. However, it’s vital to choose the right fluid based on the specific type of transfer case your Jeep has. Each transfer case has its unique requirements, and using the wrong fluid can lead to significant issues. So, what are the Jeep transfer case fluid types? The primary fluid types for Jeep transfer cases include ATF (Dexron III or higher), Mopar lubricant, and ATF+4. The ATF (Dexron III or higher) is suitable for various transfer cases such as NP 119, 207, 208, 219, 228, 229, 241, 242, and 249. In contrast, the NP 247 transfer case specifically requires MOPAR transfer case lubricant (5016796AA, which has been superseded by 5016796AC). Additionally, Jeep models equipped with NP 231, 241, and 241-OR transfer cases necessitate ATF+4 fluid. Let’s dive deeper into the article to explore the types of transfer cases and their corresponding fluid types, as well as the process for changing the fluid.

Jeep Transfer Case Fluid Types

The fluid within the transfer case plays a vital role in lubricating its components. If this fluid leaks or becomes contaminated, it may lose its lubricating properties, potentially leading to severe damage. Just as different vehicles require specific types of coolants, the fluids used in transfer cases also differ. It’s crucial to identify the correct fluid type for your specific transfer case. Here’s an overview of the fluid types based on the various transfer case models.

ATF (Dexron III or Higher):

ATF (Dexron III or higher) is a versatile fluid that serves both automatic transmissions and power steering systems. It is one of the most widely used hydraulic fluids in automatic transmissions and transfer cases. Jeep transfer cases NP119, 207, 208, 219, 228, 229, 241, 242, and 249 typically use this fluid.

ATF (Dexron III or higher) contains specific additives designed to enhance lubrication, protect against wear, and improve shifting performance. Its high viscosity index allows it to maintain thickness and lubricating properties, making it well-suited for transfer cases that operate under varying temperatures. Utilizing ATF in a transfer case can lead to smoother operation and improved shifting performance, particularly in colder weather.

MOPAR Transfer Case Lubricant (5016796AA superseded by 5016796AC):

The MOPAR transfer case lubricant is specially formulated to provide superior protection and lubrication. This synthetic blend lubricant is engineered to meet the specific requirements of transfer cases, including NP245, NP247, and NP249.

Manufacturers recommend using this lubricant for Jeep vehicles, particularly the Jeep Wranglers, as it provides excellent protection against wear and tear. Additionally, genuine OEM Mopar transfer case fluid ensures dependable performance, keeping your Jeep in optimal condition.

ATF+4 Transfer Case Fluid:

ATF+4 represents a more advanced category of automatic transmission fluid, boasting a superior formula compared to its predecessors. This synthetic fluid contains unique additives specifically designed to enhance performance. It offers improved protection for modern automatic transmissions, including better shifting performance, enhanced oxidation resistance, and reduced wear.

These fluids are predominantly used in Jeep Wrangler models equipped with transfer cases such as NP231 or NP241. Refer to the following table for specific fluid requirements based on the model year of your Jeep Wrangler.

Now that you have a better understanding of the various transfer case fluids, let’s look at the process of changing old fluid for fresh fluid.

How to Change Transfer Case Fluid

Over time, transfer case fluid can become contaminated with dirt, debris, and metal shavings, which can cause damage to internal components and reduce the effectiveness of the lubricant. This contamination can lead to increased friction and wear on gears and bearings, potentially resulting in transfer case failure. Additionally, old transfer case fluid may not effectively dissipate heat, leading to increased operating temperatures that can further damage internal components. Therefore, it’s essential to know how to change the transfer case fluid regularly. Here’s a simple guide to help you perform this task efficiently.

Required Tools:

Here are the tools you will need for this job:

• Transfer case fluid
• Drain pan
• Extraction syringe
• Wrenches
• Ratchet
• Wheel chocks

Procedure:

Follow these step-by-step procedures to complete the task properly:

Step 1: Get the Vehicle Ready

First, allow the vehicle to cool for at least two hours to avoid handling hot fluids. Once cooled, engage the parking brake and place wheel chocks in front of and behind at least one wheel to ensure stability.

Step 2: Remove the Old Fluid

To drain the old fluid, locate the drain and fill plugs, which are usually situated near the rear of both the transfer case and the vehicle. The lower plug is for draining, while the upper plug is for filling. Begin by removing the fill plug first, followed by the drain plug. Allow the fluid to drain completely to extract as much old fluid as possible.

Step 3: Put the Drain Plug Back in Place

After all the fluid has drained, reinstall the drain plug, ensuring that the fill plug remains removed. If the space beneath your vehicle is limited, a recommended filler/extraction syringe can be quite handy for adding fluid.

Step 4: Refill the Transfer Case

Next, refill the transfer case. Note that there is no dipstick to check the fluid level; therefore, the general rule is to fill the transfer case until the fluid overflows. Use either the fluid bottle’s spout or the syringe to fill the fluid into the filler plug hole until it begins to run out.

Step 5: Wipe Out Excess Fluid

Once filled, replace the fluid fill plug and wipe away any excess fluid from the transfer case. Properly dispose of the used fluid at a local auto parts store that often provides free recycling services for used oil and fluids. If you encounter difficulties or are unsure about the process, don’t hesitate to consult a mechanic for assistance.

Frequently Asked Questions (FAQs):

When does transfer case fluid need to be changed?

If you notice loud noises while driving, it may indicate that it’s time to change the transfer case fluid. When the fluid loses its ability to lubricate effectively, friction can lead to grinding noises that may become more pronounced when engaging four-wheel drive.

Do transfer cases leak oil?

Yes, transfer cases can leak oil due to faulty seals or internal issues. A damaged output shaft seal can lead to leaks, as it connects the transfer case to the axle. Additionally, damaged gaskets or cracks in the housing can also cause fluid leaks.

How long does transfer case fluid last?

Typically, you should check your transfer case fluid after every 30,000 miles to see if it requires replacement. Signs that indicate a need for a fluid change include howling, whirring, clicking, clunking, banging, or rumbling noises.

Conclusion

In conclusion, this article has provided a comprehensive overview of Jeep transfer case fluid types. Selecting the correct fluid type based on your transfer case is crucial for maintaining the functionality of your Jeep. With this information, you should now have a clearer understanding of the fluid types associated with each transfer case model and the necessary steps to change the fluid effectively.