2023-2026 Jeep Wrangler Rear Axle Seal Oil Leak TSB

Jeep has issued Technical Service Bulletin (TSB) 9100749, dated January 7, 2026, addressing an observed issue with rear axle shaft oil leaks in certain 2023-2026 Jeep Wrangler (JL/JT) models. This communication provides specific instructions for technicians to correctly resolve the Jeep Wrangler axle seal leak.

Symptoms of a Rear Axle Oil Leak

The primary symptom owners might notice is an oil leak originating from the rear axle area. This could manifest as oil spots on the driveway or garage floor, particularly near the rear wheels. An axle seal's purpose is to keep lubricating fluid within the axle housing and prevent contaminants from entering. A leak indicates that this seal is compromised.

If left unaddressed, a rear axle oil leak can lead to several problems. Loss of lubricating fluid can cause increased friction and wear within the axle components, potentially leading to premature failure of bearings or gears. This could result in unusual noises, reduced performance, or, in severe cases, complete axle failure.

Understanding the Rear Axle Seal Leak in JL/JT Models

The TSB specifically notes that some JL/JT rear axle shafts are leaking oil. This indicates a manufacturing or design issue with the original components. The instruction provided to technicians is crucial for ensuring a lasting repair and preventing recurrence of the Jeep Wrangler axle seal leak.

The Correct Repair for a Jeep Wrangler Axle Seal Leak

According to TSB 9100749, the correct repair procedure for a rear axle shaft oil leak is to replace both the axle shaft and the seal together. The bulletin explicitly states, "Do not replace seal only." This instruction is critical because replacing only the seal might not resolve the underlying issue if the axle shaft itself is contributing to the leak, perhaps due to surface imperfections or wear. By replacing both components simultaneously, Jeep aims to ensure a complete and effective repair.

Technicians are also instructed to keep the original seal and axle shaft and send them back as "fast track" parts. This typically means the manufacturer wants to analyze the failed components to better understand the root cause of the issue and potentially improve future designs or manufacturing processes.

Affected Part Numbers

This TSB references several part numbers associated with the axle seals and shafts that may be affected by this issue. These include:

• 68393687A$
• 68401306A$
• 68401382A$
• 68401383A$
• 68401892A$
• 68401893A$
• 68471168A$
• 68474094A$
• 68474263A$
• 68474264A$
• 68639186A$
• 68651312A$
• 68651313A$

What Owners Should Do

If you own a 2023-2026 Jeep Wrangler (JL/JT) and suspect a rear axle oil leak, or if you notice any of the symptoms described, it is recommended to contact your authorized Jeep dealership. Inform them about the potential Jeep Wrangler axle seal leak and reference Technical Service Bulletin 9100749. The dealership will be able to diagnose the issue and perform the necessary repair according to the manufacturer's guidelines.

Source: NHTSA manufacturer communication 11027644.