Hi and welcome to Mightyram. It will be a KM-145 transmission (2.6 engine). The irritating thing with the Gen 1 trucks is the chassis number is on the end of the frame somewhere under the rear tray. If you have a tow hitch mounted to it, the hitch brackets cover it. This is usually the VIN the dealers want (if they can even know what your truck is and have access to the model data)