Afa Motors Wheel Bearing and Hub Assembly is Perfectly for Front Position, with ABS Encoder. The wheel hub assembly is Filled with Premium Grease to Help Improve Performance, Superior Seals Allow it to Smoothly Rotate and Keep the Wheel Attached to the Vehicle, Guiding Precise Steering and Ensuring You Driving Safety. Fitment: 1999 For Ford F250 Super Duty1999 For Ford F350 Super Duty Notice - This wheel bearing Only Fits for Front Position, 4WD,2-Wheel ABS, with 8 Lug Kit Includes- 2 x Wheel Hub and Bearing Assembly - 515076 Specifications Bolt Circle Diameter (IN) 6.693 Bolt Circle Diameter (MM) 170.000 Brake Pilot Diameter (MM) 129.000 Flange Bolt Hole Quantity 4 Flange Diameter (MM) 203.000 Flange Offset (MM) 51.500 Flange Shape Square Hub Pilot Diameter (MM) 113.900 Spline Quantity 55 Wheel Pilot Diameter (MM) 125.000 Wheel Stud Quantity 8 Seals Design Multi-lip Design Configuration and Extreme Temperature Seal Materials Keep Dirty out to Effectively Provide Smooth and Safe Driving. Precision Processes The Manufacturing Processes Used to Work Quality Steel into a Finished Product Includes Forging, Turning, Heat-Treating, Grinding and Polishing; They are Critical to the Quality of the End Product. Meet OEM Quality Vibration-Free Wheel Bearing and Hub Assemblies are Machined to Meet Optimum Performance. Also Improved Those Traditional Design Weaknesses. Maintenance-Free Our Wheel Bearings are Designed to be Totally Maintenance-Free. Since They are Filled with Grease Which will Provide Sufficient Lubrication for the Rolling Elements for the Entire Service Life of the Wheel Bearing. The Symptoms of Bad Wheel Bearings Include: -Noise: A Humming, Rumbling or Growling Noise that Increases with Acceleration or as the Vehicle Turns. A Loud Constant Whining or Grinding Noise When the Vehicle is in Motion. Clunking Noises When Driving Over Uneven Road Surfaces. -Looseness, Excessive Play in the Steering Wheel (Vague Steering); -Steering Wheel Vibration Which Changes with the Vehicle Speed or As the Vehicle Turns; -ABS Malfunctioning, Warning Light. ABS System Issues Can Be Related to Failure of the ABS Sensor That is Integrated in the Wheel End Bearing.