Tranny and tcase have different fill and drain plugs. Tranny fill plug is on the dside of the tranny, roughly halfway up, just behind the bellhousing. The drain plug is below and slightly to the rear of the fill plug.

The tcase drain plug is on the chain housing, low on the dside, pointing to the dside. The fill plug is between the input and output shafts on the rear side of the chain case.

Make sure you can remove the fill plug before you drain the lube. The fill plug level is the fill level on the tranny, but not sure on the tcase.

I've found that the drill powered pumps do a great job of pumping the lube in, much better than the bottle mounted pumps. I use a bent piece of copper line on the fill side and hook it in the fill hole, with the suction side in the bottle. The pumps usually have garden hose fittings (male thread). I buy a washer hose at Home Depot with two female ends and cut it in two to get two hoses to fit the pump.