Once lower mount is removed (one next to where the mani and centre pipe connect) the engine WILL NOT drop, but will slightly sway back to front, but very easy to move by hand to line all the bolt holes up, just remember which way you took it off, as it will go on both ways, but if on the wrong way the gear linkages will catch, its only 2 x 17mm (maybe 19mm) bolts on the box and a 15mm nut where it connects to the chassie, piece of cake mate