Well; I did the fluid change on my Rear Differential and my Transfercase.
The job took about 1/2 hour for the rear and about 1 hour for the Transfercase. The only reason it took that long for the Transfercase is that the filler plug is Very hard to get at.
I used Castrol's Syntec 75W-90 Synthetic Gear Oil($12.50/946mL) and needed only 1 bottle for both.
The Rear Diff took about 500 to 520 mL of oil and the Transfercase about 300 to 320 mL of oil.
Tool/Parts you need:
A- Drain Pan
B- Rags or Paper Towels
C- Gear Oil
D- 2 Aluminum Crush washer for the Rear Diff Plugs
E- Liquid Gasket for Transfer Case Plugs
F- 10 mm Allen Key-type wrench for the Rear Dill Plugs and for
the Drain Plug on the Transfer Case
G- 12 mm Boxed end wrench for the Filler Plug on the
Transfercase. You should have 2(an 8" or so long one to
loosen + a short one about 5" or less to work after loosening)
H- Liquid Wrench or some other penetrating oil
I- 1/4" Inside Diameter Tubing about 12" long(To pump the oil in)
J- Cardboard (it gets messy)
1)-Park on level ground. I used 2 2x4's stacked so the whole car sat up an extra 3" off the ground for clearance.
2)-Spray some Liquid Wrench on Filler and Drain Plugs and let sit for a few minutes to soak.
3)-IMPORTANT....Remove the Filler Plug FIRST*. If you cant undo the filler plug; STOP and have it done in a shop. No need to go any further if you can't fill
There may be some oil that comes out of the Filler Plug so have your drain pan under it.
4)-Remove Drain Plug and let oil completely drain. The drain plug on the Rear Dill has a built in Magnet. Wipe it clean. After the oil is drained; install the new crush washer and install the drain plug.
5)-Attach the 1/4" Tubing to the Oil bottle. Insert the Tubing into the Filler hole. Squeeze the Oil bottle and fill until the oil over-flows out of the filler hole.
6)-Install new crush washer on filler plug and tighten. Wipe area clean or use degreaser afterwards.
The proceedure is the same for both Rear Diff and Transfer Case with the execption of the crush washer on the Rear Dill and Liquid Gasket for the Transfer Case.
Be carefull about dripping oil onto the exhaust pipe when doing the Transfer Case. Stuff rags or paper towels up in the "drip zone".
Here are some photos.