I have an A3 Sportback 2007 Tdi 140 cv. And ever since the begining to more or less extent, if in first gear and at a costant rev of say 1500 rpm, if i let go of the accelerator suddenly or step a little on it (so the car pulls or lets go with a jerk) I hear a metalic clack clack sort of transmission sound in the lower part of the engine. This only happens if the car has been outside at low temperatures say 5-8ºC or less. The sound is no longer herd after a few minutes of idle, or after driving for a couple of kilometers. If the temperature outside is warm, even if the engine is cold, there is no sound. What could this be? the car is on its 3rd gearbox due to other problems (last of which was to eliminate this sound) with no luck (all paid for in warranty). Where could this sound be coming from? I fitted a lower dogbone mount insert hoping that this jerking clack sound would be coming from a soft OEM mount, but nop... not the case. Any ideas would be great. At audi, car has been several time, and either they dont know, or they dont want to find the problem.