Will a two wheel drive transmission fit in four drive?

No, a two-wheel-drive (2WD) transmission will generally not fit directly into a four-wheel-drive (4WD) vehicle's drivetrain. While there might be some superficial similarities in the gearbox itself, the 4WD system incorporates additional components like a transfer case, differentials, and driveshafts that a 2WD system lacks. The mounting points, output shafts, and overall design are fundamentally different. Even if you could physically fit the transmission, connecting it to the rest of the 4WD system would be impossible without major modifications – likely a complete redesign.