I know my truck has 160k miles with 9-1/2in rear diff. I'm not sure about transmition. Its automatic and I know that the pan is square pan with 16 bolts which means its one of three: (4L60/TH700/or 4L60E). I would like to know how to identify which one I have. I have about a 500 budget. I was going to use the money to buy exhaust that is pretty bad now. Overall the truck is solid, engine doesn't knock or leak fluid. I use this truck as a daily driver but I can afford to be out of a vehicle for a few days to work on it.