stevechesterfield

Hi I hope someone with more knowledge can help me! I have just purchased a 1999 Galaxy 2.3 auto 133000 miles petrol. Everything seems to work great on the car except......when stating from cold and setting off it takes a few seconds for the gear to engage and then it 'thumps'into first then into second then drives normal to top gear. this goes on for around 10 minutes until it warms up and then there is only a slight delay, usually waiting to set off at the traffic lights! The rest of the box is fine. I know there is a slight delay when selecting from forward to reverse(some sort of safety mechanism to stop you crashing the box) but it sa lot more pronounced than that. Is it a fluid shortage? or is it more sinister than that.......any advice would be appreciated thanks Steve