Get a transmission replacement or new car?
have a look at used cars similar to the one you have, and compare the prices to the cost of the transmission replacement. You could be better off changing car rather than repairing it, if you can get a good price for the parts from your current car. I would only consider changing the transmission if the rest of the car is in good shape, because you don't want to replace the transmission only to have something else go wrong. Also consider that if you are selling the car in 2 years you will not get back the $1200 you spent on the transmission. If I was in your position I would break up your current car, sell the parts and put the money towards a replacement car, because at that age I don't think it is worth spending that much on a repair, when you could replace the car for $800 more
1200 dollars does not buy much of a car these days. For many cars on the market this is less then the sales tax. Lets face it there are those that pay more then that just for rims to put on a car. So if the body is good, I would suggest replacing the transmission is the best investment right now.
Clean the contacts on the switch, or buy a new one.