I like Toyota drivetrain, but I have a decent Cherokee sitting here (auto, fuel injection). I'm wondering if I can somehow mate my NP231 T-case to a Toyota case and run Toy axles under the Cherokee? I couldn't find any info on such a plan so I must refer to you!

You can run the axles under there, not sure about matting a 231 to the toy case. But I see people using toy rears on there Jeeps. Not sure about the front, make sure its a straigh axle lots of toys are IFS. Hop this helps, I am sure someone else can fill in the rest.