When driving my 2001 Kia Optima, there is a clickety clackety noise that it makes from underneath in the rear. It is not the sound of grinding rotors or brakes going bad. The sound reminds me of the sound the train makes when going across the railroad tracks. I do not know if it is the axle or what. Any suggestions?
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Sounds like the bearing might be going out in the hub assembly. You can replace the bearing itself, but it takes special tools and an arbor or hydraulic press. Most folks just replace the whole hub assebbly with the new bearing already in it. Cost is just over $100. US for the part, and labor should be about one hour. it is a fairy easy DIY repair using basic shop tools. Good luck.
if the noise is while you are driving i would suggest rear wheel bearing, jack up both sides of the car at the rear and spin the wheels, the side where the noise is comming from will not spin as free as the good side. hope this has been helpfull
Sounds like the bearings are going out in the rear hub(s). Drive the car for a few miles (if it is safe to to do). Park it and check to see if the wheels are warm, or even hot, in their center cap area. This will indicate excess friction from bad bearings. Replace the whole hub. It's an easy DIY job, if you are so inclined. Part cost should be just over $100. per axle. Shop around to find a good price. I recommend Timken hubs. best of luck.