automatic transmission master recommendation

I have a 2005 automatic transmission 307 vehicle. only in 4th gear, especially when driving at constant speed and at low revs, I was starting to go back and forth, I couldn't find a solution and spending money now bothered me. I went to the service and they started counting from the beginning, `` pads, discs, flow ..... '' I said hop after the discs. I got a special service recommendation and went to a place called PAX AUTOMOTIVE in Başakşehir. A friend named Mohammed closed his eyes and said solenoid valves. Well, we said, it's a world of costs, but no results. Again with the suggestion, I went to a service called Kardeşler in the resignation. The master said, `` My teacher will ask the engine valves if you ask the pejo master, '' he said with a very confident attitude. The engine was opened, the valves were processed. The result is FIASKO. I cut your money. I am very bored now and I think the problem is gearbox. I am waiting for your help on usa or service. Thank you.

If you want, if you don't mind giving a break number 0532 690 87 57 at least you get an idea.