[motokosusu]

sound like the driveshaft is out of balance or the carrier bearing is bad. even factory parts have a fail rate. as for the tires, the vibration is still there but at a higher frequency that you might not feel.

 

[motokosusu]

is there a change in the frequency while under acceleration and coasting also there could be a CV joint also a bad rotor that can cause this as well

 

[motokosusu]

with an increase in vibration without torque is normally a sign of something lose like a bolt, bearing, or something of that nature. the torque on the driveline kind of keeps the defect tight and reduces the vibration to a degree and once the torque is released it then become sloppy once again. so i think you have a bearing that is bad and a closer guess it may be one of the shafts of the rear diff. like a hub bearing, a bad CV joint on either end of the axle, or a bad input shaft bearing on the diff

 

[motokosusu]

if you are grabbing the axle shaft it is going to have movement in towards the diff and movement out towards the wheels that because of the CV joints are each end of the axle. the movement you do not want is an up and down movement. then that would indicate a worn out CV joint. that video it seems the CV joints could stand to be repacked with grease. the reason you want the in-out movement is that when the wheel moves up and down on terrain the axle will need to be longer or shorter depending on the elevation or drop if the wheel

 

[motokosusu]

as a general rule if the boots on the joints are intact you really don't need to do anything with them. mine has 136k on them and they are just fine i have a 2005 Pontiac vibe with 190k on them and they are just fine.so it is kind of a grab bag. oh and the grease is not a thick compound grease it is a very light grease sort along the likes of almost vasoline inconsistency

 

[motokosusu]

they just have in to out play thou not as much as in that video. one thing does come to mind and i am not sure the Touaregs have them... some half shafts or what we been calling axles have a clip in them to prevent the shaft from overextending through the CV joints. as i said am not sure if the Touareg half shafts have them, i never had one apart from a Touareg and not sure if the shop manual shows them as a serviceable parts. this image is a typical half shaft layout the inner joint use the tripod that is normally where you get the in and out play from. the rollers that move in channels in the housing. the outter joint is basicaly designed to flex

 

[motokosusu]

you definitely have a ghost in the machine ... time to get the priest

 

[motokosusu]

oh, i had another thought there have been cases when a disk on the brakes will crack in the cooling fins and will cause a slight swell in the surface of the disk and that can also cause a vibration.
hub bearings will generally make a tump tump noise but not a great deal of vibration. i am trying to go through my mental list of anything that could cause vibration and i am pulling from 40+ years of civilian and military experience and most a good 85% were caused by bearings and or balance. it seems their biggest problem is localizing it and the sad is a lot of driveline sounds and vibrations telegraph throughout the driveline what you think is in the front right may actually be the left and so on.

 

[motokosusu]

not sure on the Touareg without it going coocoo for cocopuff. sooooo many things nowadays rely upon certian things to be working. the only thing you could do is remove it and if the traction control goes nut then you know you cant. i know where you are coming from on that idea and the only thing is the front-drive will still be spinning unless you are trying to isolate a torque related vibration

 

[motokosusu]

i hope he can discover where it coming from

 

[motokosusu]

HAZA!!! enjoy your smoooooooth ride