I have seen two different types of boxes fitted to 3tgte. One is the T series ones you are talking about and the other is what I call the supra style box, which I have in my car. This box came with the engine when I brought it, from what I've seen the T series boxes are not as big and have a smaller input shaft(clutch to gearbox). Also I have floged the you not what out of mine for 5 years now and gearbox is still going strong. Hope this helps.