Strong vibrations during acceleration, V70-2 T5 automatic

Hello I have strong vibrations on the vehicle when I accelerate between 90 and 120 km/h. If I take gas away the vibrations have also disappeared. Under and above the above mentioned speed there is nothing to feel, the steering wheel remains in any case calm. Engine and transmission bearings were made completely new from one year. I already changed the drive shaft on the left because I had the feeling that the vibrations had their origin there. In doing so I found that the shaft in the transmission approx. The shaft can therefore be moved up and down about 5 mm in the built-in condition. It’s probably not normal… If the vibrations come here or someone else has a tip. Thanks and greetings Björn