I am not sure about the tcase, but when i did my 3.4 swap in my 4runner, the r150 that was behind my 3.0 bolted right up. I ended up using the 3.0l flywheel, clutch setup. I think the other option is the 3.4l flywheel, clutchkit, but 3.0l throwout bearing.
did you have to modify your cross member. Picked up a 95 4Runner r150f and it's 3 inches to short on my cross member so I think the shifter will hit my dash or no?