Where to find the informations on the gearbox/engine

[banpei]

Well, it isn't entirely Toyota logic since Toyota isn't the manufacturer of those boxes. But basically what happens is that the gearbox is a loose component and the engine needs to be fitted to that. That's why there are different bellhousings which fit on certain gearboxes.

In case of the W series there are two generations of W gearboxes. The new series start at W55 and the bellhousings are not compatible with older series.

As stated before: the 3S fits on the 1C bellhousing. If you currently have a 2C engine fitting on the W59 gearbox it should fit the 3S engine since the 2C should have the same block as the 1C. I also see several resource around the world saying the 1C and 2C both fit.

Personally I would go for the 3SGTE. If you would put a 4AGE in there you only would be disappointed in the amount of time, money and effort you put into it and having less torque than the 2C diesel had.