The U-Series uses needle bearings; just like OEM parts; but are made with a superior chromoly steel body. The Rugged propeller shafts are designed to act as a direct replacement for the OEM shafts. The shafts are powder coated in black for extreme durability. Designed to be vibration free; the shafts have a long service life. Heat-treated high-quality alloy steel and precision CNC machined. These beefy rear right propeller shafts are sealed tight to prevent wear and require no maintenance. Phased and balanced - no vibration. The propeller shafts are fitted with greased heavy-duty u-joints that are replaceable if needed. Rugged stands behind every shaft; backing them with a 1-year limited warranty.