If you plan to fully do all seals, yes the trans case itself separates and is rtv, but all in/out shafts and cable shafts have ring seals.
I bought my 97 this summer and had some leaks. More i looked it was worth it to totally drop the transmission and trans case and replace everything! Cost was very minimal, maybe $40 for ALL seals and rtv. Better than dealership charging $350 (which in their words was bargin).