Understanding Your Needs Before the actual purchase of any used transmission and chevrolet engines, one must be crystal clear about their needs. This is not just a simple replacement but an understanding as to what can keep your car running smoothly and efficiently. Checking Your Car Start with the type of vehicle make, model, and the year of your Chevrolet. No matter if it is a classic Dodge, Chevrolet 300, or a Jeep Cherokee, these are details that might help narrow down your options to a tee. Such details spare you from frustrating moments when you realize you have bought the wrong part.