Can Nissan 1400 engine fit onto Nissan 720 4x4 gearbox?

Yes, a Nissan 1400 engine can be fitted onto a Nissan 720 4x4 gearbox, but modifications may be necessary for proper alignment and compatibility. The 720 gearbox was designed for a different engine, so adapting mounts, bellhousing, and possibly the driveshaft may be required. It's advisable to consult with a mechanic familiar with both models to ensure a successful installation.