your aircond heat exchanger need to put down. like hilux surf. u need to use the bellhousing to mod into your existing gearbox so that u can maintain your 4wd...if u are using ln106/ln166, change to SR face lift or surf face lift so that u have more rooms behind your gril to route your intercooler piping or re locate your radiator more to the front.
What if I would just use the gearbox that came with the engine, will it be strong enough to support the weight? I have seen a few of these mods on youtube and some other forums but am not clear if they would mod the firewall so that the engine will have more space.