Center bearing squealing! Help!

[panzerwagen]

I too have a problem with the prop but in my situation the damn bearing is NEW!!!!
The shop who installed it can't figure it out! They say an old prop and a new bearing makes for a bad mix!
It only starts squealing like a stuck pig intermitently between 20 and 40 mph. The shop doesn't want to deal with it anymore and has refunded half the fee for the installment.
Anybody have any ideas why it is acting like this?

[martinjs]

You fitted a BMW mount yes? Loads of people have used these myself included without problems, all i can suggest is that its the wrong mount somehow. Do you have any pics of it at all?

[panzerwagen]

Martin it's OEM!

Straight out of the dealers stores. And believe it or not , it is the second new one. The shop decided to install another one after I complained about the the first one they put in.