Any tips for Auto box oil change

Right,

I've got my new Auto Gearbox filter and various seals and gaskets, got 15 Litres of Dexron 3 from euro car parts.

anyone any top tips for the draining and refillig of this gearbox? I understand that I cannot drain all the oil as some will still be in the oil cooler and torque convertor

gonna be towing a caravan soon too, is it worth fitting an aux oil cooler for the gearbox? where would I get one from if so?

regards

It's been covered before many times. You can start here: http://www.landyzone.co.uk/lz/f8/check-auto-box-oil-td5-41888.html