Upper Extension Cover for Driveline Housing ?

This OEM-grade replacement seals and shields the tail of the transmission/transfer case in your tough pickup or SUV. It locks in gear oil, keeps dust and water out, and holds the output/selector area in perfect alignment. Built for load, heat, and vibration, it’s the smart fix for leaks and noise.

Why you need it ?️

Without a tight cover, the extension housing can’t keep pressure or lubrication. The output bushing runs dry, splines corrode, and driveline shake grows. A new cover restores sealing, stiffness, and correct shaft geometry after impacts, warping, or corrosion.

How it works ⚙️

The cover bolts to the housing and compresses an O-ring or thin RTV gasket to form a fluid-tight joint. Its machined face centers the shaft and guides oil return, while internal ribs add rigidity so the tail stays true under torque. Precision-cast aluminum with anti-corrosion finish resists heat cycling and off-road spray.

If it fails ⚠️

Expect oil leaks ?, whining or clunk on shifts, harsh 4H/4L engagement, and play at the prop shaft. Run long enough and you’ll see burnt bearings, seal blowout, metal debris, and a costly gearbox or transfer rebuild.

Install tips ✅

Clean mating faces, apply a thin continuous RTV bead, bolt up in a star pattern to spec, and refill fluid. Ideal for daily use, towing, and off-road duty ?.

Compatibility

• Np300 Frontier
• Navara
• Frontier
• Xterra
• Terra