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have you run it on a lift to pinpoint the noise?
is this a quattro or cvt front wheel drive? im wondering if you have a center support bearing failing, but that would only apply to all wheel drive. thank you.
Kyle S.A.S.E. certified master auto technicianlicensed smog technician, test and repair, L-1 advanced engine performance certifiedCertified Volkswagen technician, 2003,2004,2013,2014,2015Volkswagen and Audi technician, Independent, 11 years.
if you are not able to duplicate the issue with the vehicle off the ground, that will definatly make it harder to pinpoint. in the past with older vehicles i have had someone else drive and sat in the backseat just to see how much noise is actually toward the rear. there is a tsb for premature wheel bearing failure in the front for this vehicle, but since the sound does not change during turning, rules that out somewhat. center support bearings failing are fairly common, usually on older a4's, and especially on vw touaregs. if you remove the heat shields, lift the vehicle, and run the drivetrain, you may be able to have someone load it up enough to duplicate the sound, while listening to the different components with a stethascope to pinpoint the sound. i like to use a tool called a chassis ear, it lets me clip leads all over the car and run them to a set of headphones that amplifies the sound, then you can click to the specific areas you placed the leads to narrow down the sound.
i have not come across that issue with your model, i have replaced a tcm inside the trans on that model for no communication. if you have the ability to pull fault codes from the tcm that may be helpful, but typically that will throw a "check tcm for errors" code in the ecu as well. if you install a used trans you may have to have the tcm coded to the original coding of the original trans, you can also modify coding to change shift characteristics in the tcm. as far as reflashing, that would usually be for a specific issue, not for a swap.
i hope this info helped, thank you.