E83N (X3 1.8d, X3 2.0d M47N2, X3 2.0d N47, X3 2.0i, X3 2.5si, X3 3.0d, X3 3.0sd, X3 3.0si). • The drive shaft of an gearboxses are sent out, disconnected from the middle joint. You don't have to worry about keeping the drive shaft in balance later on after assembling.