Well of course that would mean that you are going to basically drop everything up front, under the fenders, and replace with one from an MTX. That's cool if that is what you want to do.
As for what the MTX will hold, man that is a deep subject and better left to Terry Haines. Most around here though have just updated there older MTX's to the 2000 model year spec and added a Quiafe LSD. I guess that alone makes it about as bulliet proof as you can get with what you have.
If you are worried about other hard parts, like individual gears and what not, I really don't think there is an aftermarket supplier that has beefier gears. Just the differential. Which is really what you should be worried about.
