car jerks, overheats, and wont go in reverse

What is your question?

okay im having a lot of car problems. the transmission was replaced a few years ago but now the car is jerking a lot and then it kept dying when I put it in reverse, and ontop of that it overheated and I just replaced the entire cooling system and gave 'er a tuneup, and I dont know if its the brakes or what but the car makes a really loud squealing sound and I hear a clanking like those little monkey toys with the symbols clanking together. any ideas? I'm afraid to drive 'er to the auto place at the moment.