I am assuming your Bevel Box is the standard box with no upgrades:
Take the vehicle for a drive to warm the box.
Jack up the vehicle so you can get under the rear with the front slightly higher than the rear.
Go under rear between the tire and the box, feel up for the two bolts above each other at the bottom of the rear facing side of the box.
Undo the upper bolt first this is the fill hole. Then undo the lower bolt which is the drain enuring you have the drain pan ready.
Once empty replace the lower bolt and lower the front of the vehicle till level.
Fill up with fresh oil through the upper hole till it flows out of the hole (this is the fiddly bit a hand pump can help put the oil in, also warming the oil first or if not using a pump putting a pipe in from above helps) and replace the bolt.
Then you are done. Hope this helps?
Last edited by britmog; 11/04/21 03:59 PM.