TOYOTA 42443-55020 Rear Axle Shaft Flange Gasket

The genuine TOYOTA 42443-55020 rear axle shaft flange gasket is a precision sealing element designed to ensure a hermetic seal at the connection between the rear axle housing and the axle shaft. This original OEM (Original Equipment Manufacturer) part guarantees a perfect fit and durability compliant with factory specifications.

Function and Operating Principle

The primary function of the rear axle shaft flange gasket is to prevent gear oil in the differential from leaking from the axle housing toward the wheel hub and brake assembly. In addition, it blocks external contaminants such as dust, moisture, and road grime from entering the axle joints, protecting the bearings and gears against premature wear.

Technical Specifications

• Manufacturer: TOYOTA (Genuine OEM part)
• Part Number: 42443-55020
• Part Type: Rear Axle Shaft Flange Gasket
• Fitting Position: Rear axle, axle shaft flange / wheel hub connection
• Material: High-temperature and oil-resistant gasket material capable of withstanding the chemical effects of gear lubricants and mechanical stress.

Signs of Failure and Consequences

Aging, cracking, or mechanical damage to the gasket can lead to the following symptoms:

• Oil Leakage: Signs of oil appearing on the inner side of the rear wheel, brake backing plate, or brake drum/disc surface.
• Reduced Braking Performance: Gear oil leaking onto brake components can severely impair braking efficiency, posing a serious safety hazard.
• Noisy Operation: Gear oil loss results in insufficient differential and bearing lubrication, causing increased running noise and rapid gear wear.

Installation Recommendation

The axle shaft flange gasket is a single-use component. If the axle shaft is removed or disassembled for any reason, the gasket must always be replaced with a new genuine part to restore a leak-free seal. During installation, ensure the mating surfaces are thoroughly cleaned and the factory tightening torques are strictly observed.