I'm assuming its an auto? I've seen a few guys use the RVR trans in theirs and stay auto with a 4G63. 4g61t.org has a section dedicated to these things so there is a little more info on there. If you plan to do a manual swap I know a guy that may have a pedal and shifter assembly for the swap, again assuming yours is auto. I only guessed it was because the auto transmissions in these things are notorious for failing.
For $150 though, you stole this thing for sure. I paid $350 a few years back for a fwd auto with a bad trans and thought I got a good deal. They are super fun and practical for sure. I've owned a total of 4 so far.