Left rear ball replacement

Hello friends. As I was walking on the straight road with my vehicle, there was a slight humming sound. I thought this was a sound caused by the tires' contact with the ground. It is a very difficult voice to distinguish. When I took the vehicle to my mechanic, we took a tour and then I removed my vehicle. All wheels are checked. Some sound comes from the left rear wheel. My mechanic said that this will not be a problem, but if I want to change it, he will do whatever it takes. He said that there is a 120 TL piece price plus it will be workmanship. What should I do? It is not noticed when you do not focus very carefully on the sound. The possibility of damaging another part of my vehicle in the future, which is messing with my head. Waiting for your comments .. Thanks in advance

Does it sound like a whistle? I also had some time. At high speed there was a subtle sound in the left bends. I'm not paying attention now, but maybe our problem is the same ??

There is no sound, it is a difficult month to distinguish a sound very similar to the sound that the tires touch the road.

If it is broken, it doesn't make sense to change it in this way, but the price of that ball is 55, not 120. Show me another master if you want

Maybe he said right and left. I don't think someone will do it wrong. I already go to the track and get it myself. After making the change, I throw the old piece into the trunk.

40 lira ball I got it wrong.

If you are going to buy a ball, I recommend you to buy SKF. They remove the old ball from the press by pressing. They want 10-15 TL in the lathe.

I bought 40 + 40 two balls. I change the right left back. I gave the lifter 20 lira. It is very full here. It takes a long time. The work of the vehicle is getting squeezed. Always look at the master.