Recently my transmission went on my 99 GT. It is an automatic, and just rolled over 100,000 miles. I was told by my mechanic it would be around $2,000 to replace it with another automatic. I have heard it is possible to convert them to a 5 speed (which is what I wanted, but had a broken arm at the time of the purchase) and wondering what the price difference is. I would either like to A) Replace it with a 5 or 6 speed B) Replace it with an aftermarket automatic setup or C) Get out what I owe on it by selling it how it is. Let me know, any advise is greatly appreciated.