The cost to replace a transmission in a 2015 Chevy Silverado can vary depending on the type of transmission, where you have it done, and the warranty. The average cost for a new transmission is between $3,500 and $4,000. If you need to have your transmission rebuilt, the cost will be between $2,500 and $3,500. If your vehicle is still under warranty, your costs may be covered by the manufacturer.