I've just changed my old sri for an 07 3ltr v6 CDTi auto Elite. The car is great except for one annoying issue.
When I'm cruising at any speed, the auto box adopts a high gear and the revs sit at about 1100 - 1500 rpm. The car has a shudder through the drivers seat! My first thought was wheel balance, rear bushes etc, but if i drop it a gear the shudder disappears, suggesting an engine and or gear box problem.
There are no warning lights, no smoke and the car still accelerates like it's being chased!!
Has anyone got any ideas where to start looking?