A member here (RRPhil) makes a living fixing automatic transmissions.

He hasnt been here in a while, I think he is in the Range Rover forums usually.

He has postings here with technical info that may help, do a search for them.

Or maybe track him down in the UK Range Rover forums.

He looks to be very knowledgeable on these transmisions and hopefully he can help you.

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04 X5 3.0i auto
03 X5 4.6is