If you want help, you have to do a bit of work yourself.
Read back through the thread. All the clues are there. If in doubt take a picture of the gearbox end of the driveshaft. Either side will do, but the nearside one will be easier to see.
Don't let this turn into a '15 inch wheel' scenario
Nope. Gearbox has its own special gear oil. There is a plug in the front face of the box. Undo and stick pinky in. Oil should be up to the bottom of the hole.