Have you checked the transmission fluid level yet to see if it's full?
Also if you suspect your turbo does it boost normally, how is the power?
Here is a Elgrand fact, They do not have exhaust manifold gaskets and can leak causing a loud noise and loss of boost pressure. You can have it replaced with one from the Nissan Navara which is a asbestos unit. This might be your problem if you bleeding off boost because of a exhaust manifold leak. It would cause similar problems to what your having.
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got this from the UK site



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