Hiya Guys ....this could be a long post so please have patients.. My Car ... Audi A4 3.0 tdi quattro V6 245bhp S-line black edition 07 plate.....So 3 yrs ago I hit a pretty deep pothole on the passenger side front and rear at a speed of around 15-20 MPH. Ever since hitting this pothole I have had a vibration coming through the car at motorway speeds 70- 80 mph . i can feel something is not right even at 40 mph , seems like the car just doesn't feel right . I took the car to a tyre garage 4 weeks after hitting the pothole because i felt a vibration through the steering wheel and he noticed a bleb on the NSF tyre and he said that was the problem so I changed the front and the rear tyre at that time .&lt;br&gt;No Change . The tyre that came off were Avon 245 40 18"" . I replaced with vderdstien . The vibration was still there. Here is the fun part . i took the car to Audi Sunderland and we test drove the car and there service manager said he could feel the vibration so I booked the car in to be checked . The car was in Audi for 10 months ... Yes 10 months !!After 6 months audi Sunderland called me to say that the car was repaired and no vibration was felt through the car anymore after changing 2 top suspensions arms . I collected the car and the vibration was still there so I called audi customer services and also sent a email to audi Germany . So I took the car back to Audi Sunderland saying it was still vibrating so they then took the car to Newcastle Audi for there advice .. So Audi Newcastle said that they could not feel any vibration . Anyway I got the car back that week with it still vibrating and again I called Audi customer services saying after 7 months your 2 Audi garages could not fix my car or had no bloody idea what was wrong , basically Sunderland and Newcastle Audi got together and stuck to there guns with saying there was nothing wrong with the car . So I called in at Newcastle Audi that same week on route home from work and the master tech took me out while he was driving with like 1 hand on the steering wheel looking like he stole it was saying there is nothing wrong with ya car and that its a great car and all this and he was like just forget about all ya problems and enjoy ya motor .So after this drive out with this numpty I called audi customer services again and they said take the car to another branch of Audi .this time I went to Harogate Audi Synter group and mentioned nothing about the car like customer services said . Don't mention any problems just get them to test drive the car . So we went out on a test drive and there master tech was like yeah mate there is a problem with the car vibrating .. So as you can imagine I called customer services and am sure all hell broke loose with Audi wearside as the 2 garages conspired against me to get rid of the car .It was horrendous .So Harogate Audi got the car and had it for another 2 months .. They could not get to the bottom of the vibration so they called me up and said its either your rear diff ..3000£ or your Tiptronic gearbox £6000 .they said what do you wanna do . I was like you should fix the car no matter what's wrong with it as you have had the car for 10 months ... Needless to say they told me to sling it ...So to date the parts I have changed . 4 x 5 spoke s-line alloys . Original audi . Audi Paid for 2 of these FOC . 1 engine mount . FOC . 2 sets of front discs and pads . Audi paid for 1 set . all tyres which are now Perelli p-zero . Audi changed 2 of these . FOC 2 top suspension arms . FOC . The prop shaft was replaced from another car to check if this was the problem which wasn't the case . The parts I was just about to replace after having a few different specialists look at the car .front wheel bearings .... Drive flanges .... NSF wheel hub ...Some things I have noticed while driving the car .. when driving on the motorway and going slightly up hill and under power . The vibration gets worse while the car is going round a slight turn on the motorway , the vibration gets worse ..when the car straightens up the vibration kinda settles down to a steady vibration .i can feel the vibration thought the steering wheel and the accelerator pedal . If I let go of the wheel I can not really feel the vibration but soon as I grab the wheel again I can feel it and its in tune with the vibration or fettling I feel though the accel pedal .i have had 3 sets of front discs and pads on the car since this pothole . The car is warping brake discs .. The last set was installed 1 yr ago from Audi ... These last set have lasted 9 months and now I get steering wheel wobble when I brake on the motorway.I have felt the brake calipers after a long drive and the NSF caliper is hotter than the OSF caliper which lead me to belief it's the front caliper sticking on .. I spoke to Audi London last week and he said it could not be the caliper if your feeling the vibration even when not braking , he said more like the drive shaft ....so my car is warping discs every 10 months .. The car vibrates in a str8 line at 70-80 mph .. it gets worse when the car is going up hill on the motorway and also when the car is turning on the motorway like a steady left hander.the car pulls slightly to the left and yes I have had wheel alignment down 3 times and I have had the wheels tyres balanced more times than I can remember ...so before I go throwing more cash and time I was wondering anyone can help me out as Audi have no idea ..all I get from Audi is book it in and we will take a look at it as we has all the correct tools and all other kinds of bull..they had the car 10 months and told me its either the gearbox or rear diff.. I have had the gearbox checked by a auto gearbox place in Chester who said it 1 of the smoothest he has drove as he knows that Audi automatic gearboxes are pretty poor .any help would be good or advice ..Thanks and sorry for long post .