My a4 1.8t makes a whoop noise when changing down from 4th to 3rd please can some one advise what it might be

Hi Ricky...welcome to the forum

Sounds like the clutch as sometimes they can make a similar sound when under load, but generally that should occur in any gear when down shifting

Let us know how you get on with it

Cheers   Trevor 

Hi Trevor 

thank you for your reply I have now developed a judder when pulling away but this is only when the car is warm is up to temperature after about 25 miles or 25 mins into journey 

the clutch does not slip at all 

 

many thanks ricky 

That still could be a clutch fault but worth checking how much the engine moves backwards/forwards as in a faulty engine mount...just a thought