It's been a bit more than a week since I picked up the X from transmission shop where the Torque Converter was redone under the warranty.
No more shudder of any kind,I made just about 300kms and I can clearly feel the TC lock up in the same situation that shudder used to happen.
I knock the wood and hope it was the last time I brought it to transmission shop ever.
I may flush the fluid and change the filter myself when time comes.

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e53 '00 4.4i Oxford Green II Freshly rebuilt tranny(2nd one) and transfer case/front shaft
e70 '08 3.0si Sapphire Black cinnamon leather 7 seats
e61 '06 530XI Sports Touring Silver - SOLD