I dont think there are any t-cases that always spin the front drives thats what the stick on it does, it engages the gears/cahin to the front drive. I guess the open, or all wheel drive t-case would always spin the front drive.
A tacoma's front drive system is just the same as a usual jeep, even an add and manual hub is basically the same until you get down into the front axle. To answer your question which is better, id say that having one that only spins when you put it in 4 would be better otherwise you have a lamo open tcase taht doesnt do you much good if you want real 4-wheel drive, or is that real 2-wheel drive? Unless you can lock your open tcase, thats cool too.
Hmmm. It must be with the newer ADD systems. I have an 02. You guys must have the older tacomas.
Your mom has older tacomas.