There are multiple fluid brands that fulfill the specifications for General Motors transfer cases. As of September 2014 the most recent General Motors fluid, which is also downwardly compatible for this application is AC Delco Auto-Trak II, part#10-4017 88900402.
242 transfer case uses ATF+4 transmission fluid. 247 transfer case uses a special transfer case fluid available from the dealer.
Motorcraft MERCON automatic transmission fluid is used in the transfer case according to the 2000 Ford F-350 owners manual
ATF+4
It uses automatic transmission fluid.
According to the 2000 Ford F-350 Owner Guide : ( 1.9 liters / 2.0 U.S. quarts of Motorcraft MERCON automatic transmission fluid is used in the transfer case )
MOTORCRAFT MERCON AUTOMATIC TRANSMISSION FLUID
Mopar ATF+4
The transfer case has tag on the center rear of it. The model number is on there. The 242 uses regular auto trans fluid (ATF). The 247 uses a special transfer case fluid from a Jeep dealer
Its on the transfer case by where the front axle connects. It's a thin case with a motor mounted on it.
1.25 quarts or 1.2 liters
Change and flush the transfer case fluid immediately.
dex/merc 3 automatic tranny fluid