Mastering a Jeep Transmission Fluid Change: Guide on Removal, Replacement, and Refilling Procedures

Have you noticed a transmission leak on your 2015 Jeep Wrangler JK? If so, you’re not alone. The Mercedes Nag One Transmission in this model is known to have this issue. The good news is that you can repair it yourself. In this post, I will guide you through the process of repairing a transmission leak, specifically performing a pan flush and service on the transmission.

First, gather the necessary materials for the job. You will need Mopar ATF plus four, a pan gasket and filter for the transmission, as well as some basic containers for catching oil, a measuring cup, and some cleaning supplies. Additionally, prepare the working area by propping open the hood to access the dipstick for the transmission.

Removing the Cross Member and Transmission Pan

Start by removing the cross member that ties into the frame and then proceed to take off the bolts that attach the pan to the transmission using a T27 Torx bit. Allow the fluid to drain slowly and be prepared for a messy process. You may need to raise the transmission slightly to remove the pan successfully.

Replacing the Plug Adapter

Once the pan is removed, replace the electrical harness plug adapter and ensure it is properly sealed. Clean the surrounding area and the plug using a mass airflow cleaner and inspect the new adapter plug before installing it. Take the time to replace the filter and gasket, ensuring everything is clean and properly seated.

Refilling the Transmission

After completing the necessary replacements, it’s time to refill the transmission with the appropriate amount of fluid. Start with a measured amount and then run the vehicle to check the fluid level. Monitor for any leaks and ensure everything is dry and properly sealed.


By following these steps, you can effectively repair a transmission leak on your Jeep Wrangler JK. While it can be a messy and time-consuming process, it is a cost-effective way to address this common issue. Remember to take your time and pay attention to detail throughout the process to ensure a successful repair. If you encounter any difficulties or are unsure about any steps, don’t hesitate to seek professional assistance. With the transmission leak repaired, you can enjoy smooth and worry-free driving in your Jeep Wrangler JK once again.

What problem is the video addressing?

The video is addressing a very bad transmission leak on a Mercedes nag One Transmission on the 2015 Jeep Wrangler JK.

What materials are needed for the repair?

The materials needed for the repair include Mopar ATF plus four, pan gasket and filter for the transmission, cardboard, basic containers for catching oil, measuring cup, and tools such as bolts, Torx bit, wrench, socket, extension, screwdriver, and more.

What steps were taken to repair the transmission leak?

The steps taken to repair the transmission leak involved removing the cross member, loosening and removing the bolts to drain the fluid, raising the transmission to remove the pan, cleaning the area, replacing the adapter plug, installing a new gasket, cleaning the sealing surfaces, installing the filter and the pan, and finally filling the transmission with oil and checking for leaks.

What should be considered when replacing the adapter plug?

When replacing the adapter plug, it’s important to clean the area thoroughly, apply a dab of fresh transmission oil on the O-ring for lubrication, ensure the rotating ring is in the correct position, and be cautious not to over-torque the center bolt to avoid damaging the pins inside.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top