vacuum hose diagram
This should be what you need: http://www.teammightyboy.com/workshop/3 ... auto-hoses
F8B EFI turbo - Three pots and a snail.
its most likely the green vacuum switch, you can easily diagnose this by unpluging the electrical connecter and take it for a drive, if its buggered it will change gears. it can be a temporary solution, but the gear changes wont be normal, itll change but only after 40-50k's from memory.
http://www.calaisturbo.com.au/showthread.php?t=180305