Noise and Left-Handing Problem From Transmission

First of all, I just joined the greetings ...
1) I went to industry with a voice that started in 3rd gear 3 months ago. Master said he was from the gearbox. They said less than a thousand situations are available. After 3 months, the voice increased, and when I went again, the brother said that this should come down and it opens up. Indeed, they downloaded and replaced the group balls. But they couldn't remove the sound. The same voice is there again. They said that they can make this sound because the disintegrated balls create a gap, and they try to try this problem with boron additive. Where do you think the problem might be? Is there a solid master you can recommend in Ankara?

2) The front set of my car has changed originally, the z rods have changed, the flows have been overhauled, the rod adjustments have been made, the steering has been checked, the differential, etc. when the gearbox is lowered. all over. Balance was adjusted for 4 tires. In fact, the rear axle was bent and it was corrected, in short, every imaginable road was implemented, but it was not understood how the vehicle left at all. By the way, there is no problem in the chassis. What do you think can be a problem? Is there any good master you can recommend for these two problems? Thanks...

self icon peugeot serdar master brand peugeot murat master can recommend these two. both of them

antechamber. elsoberano thank you ...

the same problem was in my vehicle, there was a moaning in 3rd gear, the gas cut off, the gearbox got off, 4 bearings changed, there was a differential inside, they said well, I did not change it was 10000 km there was no problem, I made it in a special bmw service

I forgot to say that there is sound in all gears now ...