2.3 Auto Box Problem

[matnat]

i have just purchased a 2001 galaxy 2.3 zetec auto gearbox with 58k on the clock with full service history, the problem is that when i put it in drive it doesent always pull away just as if the clutch is slipping and some times i have to really acelerate hard just to get the vehicle moving,once the vehicle is moving it goes up and down the box fine and drives briliantly although there is a lot of heat coming from the gaerbox. i have changed the oil and refilled with 5.5 litres of oil and does seem a little bit better but still slipping on set off,please help any advise would be much appreciated,regards matt

[dazdaddy]

i have a 2.3 auto as well but on t plate and it does this as well but i cant get over 40mph before it stats slipping like syptons,