Front diff take it to someone. Unless you feel like either dropping the front axle out of the truck or suck the gear oil out the top though the fill hole.
Rear diff pop the cover let it drain into a pan and rtv the cover install and top off with 2.5 quarts of the appropriate gear lube.
Tcase, pull the damper, remove th3e fill plug, remove the drain plug and drain into a pan. Refill again till it won take anymore i think its just over 2 quarts use the same fluid in that is in the trans if possible.
99 x-cab 4x4 4.0l auto
mods, cranked t-bars, silencer delete, k&n drop in, Rebuilt trans ,Trans Go stage 3 shift kit, 3200stall Fuddle Racing Torque Converter,
VANIR 63mm TB, Roush split rear exit exhuast, E-Fan, JBA Headers
Auto up/down both windows, OHC, EATC (soon to be modded)
03 Crown Victoria Police Interceptor