the problem that I have is when the car is being accelerated at a speed of 20kmph, theres a vibration, which gradually decreases when I increase the speed. Tires were replaced 3 times; engine mounts were checked; front wheel hub racer was replaced; ball joints, swing arms, rack ends were all checked; tires were balanced and aligned; engine was tuned up; plugs were replaced; fuel injectors were cleaned.. according to the mechanic, it comes from the auto gear box, but I don't have any problem on the auto gear box, it works fine, the gears changes smoothly.. since its a confusing situation, let me know what else I should check and if theres anything to be done with the auto gear box. Furthermore auto transmission oil was also changed.