The transfer case will have a drain plug and a fill plug just like the diffs. I am not sure if the gen2 with the 4Hi mode needs something special. Check your manual. With the t case, it is hard to reach the fill hole with just the bottle of fluid. They make a flexable tube that screws onto the gear oil bottle that you can get up to the fill hole easier. There are also a few pumps you can buy to pump the fluid up to the fill hole. Also make sure you use the correct size socket and/or wrench, you dont want to round the plug off. I use a 15/16s or a 24mm. If you run into any problems, post up.