How to Properly Shop for a Used Transmission With the correct information, buying a used transmission may be a simple process. Start by figuring out the year, make, model, and engine type of your car. Next, look through trustworthy online marketplaces or get in touch with reputable car parts dealers. Seek out ads that provide comprehensive details regarding the transmission's condition, mileage, and available warranties. To guarantee compatibility, a lot of vendors even provide VIN-matching services. Always read reviews or ask for a vehicle history report, and be wary of offers that seem abnormally low. When accompanied by thorough research and seller openness, a used transmission can be a very worthwhile purchase.