A few pics and a quick write-up to help the first timers (like me!) out there. Please excuse the cell phone pictures.

Tools needed:

- 12mm & 24mm socket
- 10mm hex bit socket
- Ratchet/Breaker bar (torque wrench recommended)
- 3"+ extender
- 7 qts. gear lube
- Bottle pump
- Drain pan

Part numbers for crush washers and fill/drain plugs (thanks @aika1 and @d_clark ):

Transfer Case Fill Gasket 90430-18008
Transfer Case Drain Gasket 90430-18008
Front Differential Fill Gasket 12157-10010
Front Differential Drain Gasket 90430-24003
Rear Differential Fill Gasket 12157-10010
Rear Differential Drain Gasket 12157-10010

Transfer Case Drain Plug 90341-18006
Transfer Case Fill Plug 90341-18006
Transfer Case Breather Plug 90930-03172
Rear Differential Drain Plug 90341-18057
Rear Differential Fill Plug 90341-18006
Rear Differential Breather Plug 90930-03031
Front Differential Drain Plug 90341-24014
Front Differential Fill Plug 90341-18032
Front Differential Breather Plug 90930-03136
Oil Pan Drain Plug 90341-12012
Oil Pan Drain Plug Gasket 90430-12031

For some extra room to work, I put my truck on a couple of ramp stands. I used a level on the side steps to find where the truck sits on even ground. Then I tried to find a spot on my driveway so that the car was level when it was on the ramps. Luckily, I found the perfect spot and I got working:



It looks uneven but it's really level, I promise

I started in the front and removed the 4 skid plate bolts. To get the the front 2 bolts, use an extension since they're recessed a few inches.

NOTE: It is a good rule of thumb to remove the fill bolt before the drain. If this does not come off, then STOP! and at least you're not stranded in your garage without any gear lube in your car...

First I drained and filled the front diff:



Drain Plug - 10mm hex bit, 48 ft/lbs
Fill Plug - 10mm hex bit, 29 ft/lbs
Fill quantity - 1.5 qts.

Next was the transfer case:



Drain Plug - 24mm socket, 27 ft/lbs
Fill Plug - 24mm socket, 27 ft/lbs
Fill quantity - 1.5 qts.

And last, I turned the car around (after reinstalling the skid plate) to do the rear diff:



Drain Plug - 24mm socket, 36 ft/lbs
Fill Plug - 24mm socket, 36 ft/lbs
Fill quantity - 3+ qts. (6.3 pints)

I just made sure that I filled each one up the fill plug to the point where gear lube started to drip out. Toyota spec is 0-5mm from the fill holes.

I only had 5k miles on the truck at the time, but I wanted to make the switch to synthetic... I used Amsoil 75W-90 in all three. Also, I heard it's not a bad idea to switch out the factory fill bc most of the break-in for the differentials is within the first 3500-5000 miles anyway.

Here's the metal that was on the rear's drain plug:



As you might expect, the transfer case gear lube was basically still new. The front and rear had minor discoloration. Also, don't forget the magnetic plugs are the drain plugs!

Time to start towing! Good luck everyone