98 w/ auto. There is a crack in the piece that connects the tranny to the transfer case that is leaking fluid. To disassemble do I disconnect the xfer case first or the tranny?

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98, XLT, 4WD, 3.0 L, Ext Cab, Topper
Middle aged shade tree mechanic. I usually get one that somebody else thinks is used up, then fix it and drive for several thousand.