1996 bonne ssei with 141k

I just got a used tranny put in and I'm having the same exact problem. I'm pretty sure it has something to do with the tranny but don't know enough about trannys to know what it is. From what I've read it may have something to do with the torque converter.? (would they have even replaced the torque converter?) Don't really know though. The shaking is pretty bad so I'm gonna have to take it back in so any knowledge I could take in there with me would be helpful. btw the ses light is on now as well and cruise control doesn't work.

I just found a post here (http://www.bonnevilleclub.com/forum/...957&highlight=) that talks about a bad cv halfshaft being the problem. My question is if this was the problem then why did it only show itself when the used tranny was put in my car.