Another thing to watch for on the 3 litre is a slight misfire which often results from lack of plug changes on the drivers side bank of cylinders. They are often left because the inlet manifold has to come off to get at them.
I also agree the auto box is a weak link so make sure the changes are smooth and the kick down works as it should. The early ones have a 5 speed Ford unit. After about 2003 a 6 speed ZF was fitted and is generally regarded as a big improvement.
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