Differential Maintenance Tips

Resolving Gear Oil Leaks in My Jeep Differentials

Leaking Differential

Leaking gear oil can be a cause for concern, prompting a visit to the mechanic. In my case, it turned out to be a simple oversight – the plugs in my differentials weren't tightened enough. 

The Importance of Tapered Threads and Tightening

Upon inspection, it became apparent that the plugs in my differentials had tapered threads, requiring a more secure tightening than I initially applied. This oversight led to the leakage of gear oil. To address this, my mechanic Jeff decided to remove the plugs and take preventive measures to ensure a proper seal.

To enhance the seal and prevent future leaks, he applied RTV silicone to the tapered threads of the differential plugs. This additional step proved crucial in maintaining a secure and leak-free connection, ensuring that the gear oil remained where it belonged.

RTV on diff plugs

A DIY Dipstick - Jeff's Zip Tie Trick

During my visit to Adrenaline Off-Road in Maryland, Jeff, shared a handy trick for measuring gear oil levels – a simple zip tie. By bending and using it as a makeshift dipstick, I could easily gauge the oil levels in my differentials. This ingenious method provided a quick and effective way to monitor and maintain proper oil levels.

Ziptie to measure gear oil

Jeff shared many people tend to overfill their differentials. He emphasized the importance of maintaining the oil level at a specific point, as illustrated in the picture below. 

diff fill level where arrow points

Lastly, it's essential to consult your Jeep manual for guidance on the type of gear oil to use. Following the manufacturer's recommendations ensures that you're using the right lubricant for your vehicle, promoting longevity and optimal performance.

If you are looking to replace your stock differential covers check out My Step-by-Step Guide.