Quote:
Originally Posted by BigBody
2005 would be xDrive. Do you have any errors on the dash? This is one of the symptoms of failed transfer case actuator. If you give it enough gas at full lock, does the car still move?
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Actuator is easy enough to check without any tools. After you park the X5 do you get a series of clicks from under the middle of the X? If so... your actuator gear has failed. Easy and cheap service item.
If it proves to be the diff, as others have stated, much more difficult problem and not fun. I think, "easiest" method of attack would be an engine support bar and dropping the sub frame. You can undo the steering rack from the sub frame and hang it. Be sure to replace your engine mounts while you are at it if they haven't been done.