Discovery 2 Auto issue.

Hi guys,
I've recently bought another Discovery 2 this time an auto. Right the issue I have is that since the last 2 owners there has been this ongoing issue with the truck not pulling away in D! When you pull away you need to put it in 1st, once it changes gear you can put it back into D and she runs beautifully until you come to a complete stop then it wont pull away again so you have to put it back into 1st. Any ideas please give me a shout. I've been chatting to a friend of mine who reckons it sounds like a torque converter but all gears change smoothly and clean.

Thanks guys

Have a look at Ashcroft Transmission’s FAQs and you may find the answer,

https://www.ashcroft-transmissions.co.uk/frequently-asked-questions/4hp22/4e-faq-s.html

or...
I have a 4sp ZF, when I select "D" the vehicle won't move, when I select "1" the vehicle moves off. I can then select "D" and continue to drive normally. If I stop I have to start in first again. Why?
A sprag clutch has "inverted" and will need replacing. No further damage will occur if you continue to drive but you will need to select "1" every time to start moving. A rebuild is required to correct this.

As above - inverted sprag, which needs a new one.