standard 80-90 weight gear oil will work if it's a gear-driven case, like the NP 205
I'm not sure about the belt driven type (NP 203) but I think it was a bit lighter weight
Transfer case gets ATF (auto trans fluid) Axles get 75w90 or 80w90 gear oil.
The transfer case on a 2004 Ram uses ATF+4.
Automatic transmission fluid.
Mopar ATF+4
The transfer case uses ATF+4 or Dextron trans fluid.
any gear oil or atf will work to
ATF+4ATF+4
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Automatic transmission fluid.Automatic transmission fluid.
The transfer case uses ATF.
5w30 or 10w30
R-12