How do you check or service the auto trans on this car - it knocks really hard when it changing gears while in drive - say you speed off then instead of continuing to push speed you slow down you hear the loud and knocking sound from the gearbox or autotrans or whatever - not smooth at all and not sure what it is - quite a shame when it is on normal mode (not econ) as normal mode changes gears all the time - any ideas

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