9/16"-26 Spline X 3/4" Double D Stainless Steel Steering U-Joint and highly viscous silicone fluid

and highly viscous silicone fluid between the two--these SFI-approved Fluid dampers can control all crankshaft vibration

Fasteners are machined from steel for added strength

These replacement valve seats are just like the originals

these boxes have improved designs

Featuring thicker walls and more gusseting than any other manufacturer

9/16"-26 Spline X 3/4" Double D Stainless Steel Steering U-Joint and highly viscous silicone fluidSpeedmaster Steering U joints are constructed from carefully selected 303 stainless steel for its strength, superior corrosion resistance, and shine. They have such a precision machined finish that they look great right out of the box. They feature a sealed, needle bearing design that'll outlast normal steering joints, while providing positive steering response with no backlash.