I would be underneath looking for the tranny control box & wiring. There was a post earlier this year from somebody who did the same thing and lost the tranny, control box and wiring.
Really helped pay for the dealers trip to Hawaii.
$$$$$$$$$$$$$$$

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i