SlickGT1,
I sent this in a private message but thought I should post to the thread instead.
I saw your post on flipping the transfer case actuator gear and wondered if the issue I'm having might be solved by doing the same. I have a 2002 X5 E53. I engaged the cruise control while driving on a level road. As I started to climb a slight, gradual grade the X5 started to accelerate to climb the small hill. Almost instantly the X5 seemed to stall and surge violently. The car would not accelerate and multiple lights came on as the instrument panel displayed a DSC failure, Trans failsafe prog, and engine failsafe prog. Is this the same sort of thing that happened to you. Any help you could provide would be greatly appreciated. Thanks in advance.