Chevy tracker with bad tranny

[medictracker]

Hello Everyone,

So i have my 2000 Chevy tracker 4x4 Auto with a bad tranny, and a bad rearend. Here's my question.

Can i swap out for a 97 or later Geo tranny? Will it fit the 2.0?

I wanted to put a locker in the reared, can't I do that instead of replacing the diffs internals?