If it is an automatic, look at the pan. If the pan is square, it's a C-4. If the pan looks like the state of Utah, then it is a C-6. If it is a manual tranny, then it will be obvious. If it only has 3 forward speeds, then it is a 3 speed manual. If it has four, then it is a four speed manual. If it has 5 speeds then the previous owner had to do some serious alterations to get it in there, and that would be an AOD (overdrive) most likely. Let us know what you have so we can help you further.