Last week, a mechanic disassembled the driveshaft in my car and sent it to an outside garage in Warsaw for inspection. They replaced the rear joint (at the rear axle) and the front joint (at the gearbox), corrected any play, and balanced the shaft. Four days later, the shaft was returned to my mechanic, who reinstalled it in the car. The garage in Warsaw charged $400 for the shaft repair, and my mechanic charged an additional $140 for the shaft removal and installation, even though he had stated before taking the car in for repair that it would cost $80. When I asked why the service charge was higher, he replied that when the shaft support was previously replaced, the shaft wasn't completely removed, only half, which is why it cost $80. I asked the AI about this, who replied that this was not true, because replacing the shaft support requires removing the entire shaft. What are your thoughts on this? I wonder if the mechanic is not telling the truth or chatGPT is lying...

Unfortunately, the vibrations still occur at speeds of 40-50 km/h and around 1300 rpm. Since I've already performed so many repairs to eliminate the vibrations, and they're still there, it's probably an issue with the automatic transmission...