The one that fits.
18mm
Some people have reported a clicking noise in the transfer case when it's low on fluid, so check the level. If the level is fine, use a screen to drain the fluid through and watch for metal flakes. If you find them, the transfer case would need to be rebuilt.
It is on the back of the transfer case, takes a 10mm Allen wrench to remove.
Transfer case is lubricated by the transmission fluid.
Remove all wires attached to the transfer case. Remove the driveshafts. Drain the fluid out of the transfer case. Place a transmission jack under the transfer case. Unbolt the transfer case from the transmission. Unbolt the crossmember the transfer case rests on.
Go to Google.com and type in '2004 Silverado transfer case breakdown'. For the sake of all non-morons, please learn how to use a search engine as well as the internet.
Transfer cases are not like Transmissions they don't have drain pans. They only have drain and fill plugs. Transfer cases do not have filters either.
Yes it is.
Dexron. Automatic Transmission fluid
passenger side floor bord
NO, Not in the transfur case. Transmission YES
30mm