[svxfiles]

I always use Mobil1 75/90 gear oil.
You will need three quarts.
The rear plugs have a 1/2" square socket cast into them.
Only use a breaker bar, NO IMPACTS!
On the rear end you remove both the upper and lower fill/drain plugs.
After giving it time to drain,
you clean off the magnet on the drain and reinstall it.
Fill it with about .8 quarts, untill the oil/lube is spilling out the top hole.

For the front differential,
you open the drain, reinstall the plug
and refill with less than two quarts through the dipstich tube on the passenger side by the firewall.