Over time, transfer cases can develop leaks, which can be a significant concern for vehicle owners. Fortunately, these issues can often be resolved with some straightforward solutions. If you’re wondering how to stop a transfer case leak, here are some effective methods:
To address a transfer case leak, you can start by loosening the vent cap on the transfer case. If that doesn’t remedy the issue, consider using a transfer case stop leak product as a temporary solution. For a more permanent fix, replacing the gasket in the transfer case is recommended. In severe cases, replacing the entire transfer case may be necessary. If you’re still uncertain about how to tackle a leaky transfer case, this article will guide you through the process.
How to Fix The Transfer Case Leak
There are four primary solutions you can explore to fix a transfer case leak:
- Loosen the transfer case vent cap.
- Utilize a transfer case stop-leak product.
- Replace the transfer case gasket.
- Replace the entire transfer case.
Let’s delve deeper into each of these solutions.
Solution 1: Loosen The Transfer Case Vent Cap
- Identify the transfer case vent located on the top of the transfer case. This vent is a small pipe that protrudes from the case.
- Gently grip the vent cap at the top of the vent.
- Move the vent cap to ensure that it is not stuck and can move freely.
Solution 2: Use A Transfer Case Stop Leak Product
A transfer case stop leak product can be an effective way to manage minor leaks. Here’s how to use it:
Materials Needed:
- A socket wrench kit.
- A funnel.
- A cleaning rag.
- A leak-stop additive product. Be sure to check your vehicle’s owner’s manual to determine the appropriate type of transmission fluid required. Choose a stop-leak product that is compatible with your vehicle’s transmission fluid, such as BlueDevil, Lucas Transmission Fix, or ATP AT-205 Re-Seal.
Working Procedure:
- Carefully follow the instructions provided on the product label. The amount of product needed will depend on the size of your transfer case and the severity of the leak.
- Locate the fill plug on your transfer case, typically found on the side and labeled as “fill” or “level.”
- Clean the area surrounding the fill plug to prevent dirt or debris from entering the transfer case.
- Remove the fill plug using a socket wrench or appropriate tool.
- Insert a funnel into the fill plug opening.
- Add the stop-leak product to the transfer case through the funnel.
- Replace the fill plug and ensure it is tightened securely.
- Start your vehicle and allow it to run for a few minutes, which will help circulate the stop-leak product throughout the system.
Precautions:
It’s important to exercise caution when using a stop leak additive in your transfer case:
- The additive may also affect good seals, potentially leading to future leaks.
- If the seals are severely damaged or have rips, the additive may not be effective.
- Keep in mind that repairs from additives are often temporary and the damaged seal may leak again.
Solution 3: Change The Transfer Case Gasket
Replacing the transfer case gasket can effectively stop leaks.
Materials Needed:
- A new gasket that matches your transfer case model, which can be found on a sticker beneath the case.
- A wire brush.
- A drip pan.
- Transfer case fluid that is compatible with your specific transfer case, as indicated in your owner’s manual.
Working Procedure:
Follow these steps to change the transfer case gasket:
- Park your vehicle on a level surface and engage the parking brake.
- Disconnect the negative battery cable.
- Raise the vehicle with a jack and support it securely with jack stands.
- Drain the transfer case fluid into the drip pan by removing the drain plug.
- Remove the bolts securing the transfer case to the transmission.
- Carefully lower and detach the transfer case from the vehicle.
- Clean the mating surfaces of the transfer case and transmission with an appropriate solvent.
- Remove the old, worn-out gasket and clean the surfaces with a wire brush.
- Install the new gasket onto the transfer case.
- Reposition the transfer case and secure it to the transmission with the bolts.
- Refill the transfer case with the recommended fluid.
- Reconnect the negative battery cable.
- Start the engine and check for leaks.
Solution 4: Change The Transfer Case
If leaks persist, replacing the entire transfer case with a new one may be necessary. The cost for a transfer case replacement can range from $2,500 to $8,000, depending on your vehicle model.
Materials Needed:
- Socket wrench kit.
- Floor jack.
- Jack stands.
- Gasket or crush washer kit for transfer case and differential service.
- Transfer case-compatible oil.
- Shop towels.
- Brake cleaner.
- A compatible transfer case, with the model number available on a sticker at the bottom.
Working Procedure:
To replace your leaky transfer case, follow these steps:
- Elevate the vehicle and support it securely on jack stands.
- Remove the transfer case and transmission skid plate bolts, then detach the skid plates if equipped.
- Drain the old transfer case fluid by removing the drain plug and allowing it to flow into a drip pan.
- Disconnect the front and rear driveshafts.
- Unplug the electric shift motor connector and disconnect the harness clips.
- Remove the bolts connecting the transfer case to the transmission and driveshaft.
- Lower the transfer case using a floor jack.
- Install the new transfer case onto the transmission and driveshaft.
- Tighten the bolts to secure the transfer case.
- Replace the drain plug if not already done.
- Refill the new transfer case with the recommended gear oil.
- Install the fill plug using new crush washers.
- Reconnect the electric shift motor connector and harness clips.
- Reattach the front and rear driveshafts.
- Reinstall the skid plate bolts and any skid plates if necessary.
- Lower the vehicle from the jack stands.
- Test drive to ensure the transfer case operates correctly.
Can You Drive Using A Leaky Transfer Case?
Yes, it is possible to drive with a leaky transfer case, as significant leaks are relatively rare. Regularly topping off your transfer case fluid can often suffice for minor leaks. However, if you find yourself frequently adding fluid, it’s crucial to address the leak promptly. Low fluid levels can cause increased friction, overheating, and excessive wear, ultimately leading to a transmission system fault error message. In extreme cases, this issue may lead to a breakdown while driving, which can be especially problematic if your vehicle displays a limited SOS functionality message, complicating your ability to call for assistance. Regular maintenance of your transfer case is essential to avoid potential breakdowns on the road.
Frequently Asked Questions (FAQs):
What Is A Transfer Case VS Differential?
A transfer case distributes power to the differentials located on the two axles of a vehicle. In contrast, a differential channels power to the wheels on each axle. Both components are crucial mechanical devices that require proper functioning for optimal vehicle performance.
Why Is It Called A Transfer Case?
The term “transfer case” originates from its function of transferring power from the engine to the drive shaft, subsequently sending that power to the vehicle’s differentials. This component plays a vital role in the overall transmission system.
What 3 Types of Transfer Cases Are Available?
There are three main types of transfer cases: part-time 4WD, full-time 4WD, and active 4WD. Among these, part-time 4WD is the most commonly found, allowing drivers to switch between 2WD and 4WD as needed, including options for both high and low ranges of 4WD.
Conclusion
Now you have a comprehensive understanding of how to stop a transfer case leak. The transfer case is a critical component of your vehicle’s transmission system, and addressing any leaks promptly can prevent further complications. We hope this article has provided you with the necessary information to effectively manage your transfer case issues.