I thought the same, but my cousin got a bang/thump on his 740i. We also though it was either gearbox or something more serious. He also experienced loss of power. So first thing that was done before going into serious expense was to check the simple things. On an inspection the battery came up as being dead and under powered. So a new one was installed and since then the problem never came back. I'm not saying its the same for vehicles, but its worth checking first.

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Do Not Go Where The Path May Lead, Go Instead Where There Is No Path & Leave A Trail