My 4.8 does alot of the same things, in Sprort. In Drive there is no harsh downshift while braking, but in sport it lunges. I TOO had the dealer load new tranny S/W, it didnt make much of a difference in sport but helped in D a little. Maybe drive around with the mechanic at the dealer and show the symptoms? I might take mine back as well..........b

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'04 X5 4.8is Ti Silver
'03 330ci Ti Silver
'05 Dodge RAM 1500 HEMI

1932 Ford 3 Window Coupe, steel:
383 CI stroked SBC 550HP