Well, I have 30 miles on it now... The torque converter lock up clutch seems to be working much better when the car is in sport mode. The torque converter still does seem to have an issue when not in sport mode but the shudders seem much less strong. it was surprising just how fast changes were noticeable. I would say that the transition area around 50 to 60 mph is much smoother. I guess I will put a bit more miles on the X5 again and update if it get any better, stays about what it is now, or if it get worse for some reason.

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2003 BMW X5 4.4i