A transmission rebuild is a process where a vehicle's transmission system is disassembled, inspected, and repaired or replaced as needed. This service is often performed when the transmission is experiencing issues such as slipping, unusual noises, or fluid leaks. The goal is to restore the transmission to optimal working condition, extending the life of the vehicle. During a transmission rebuild, mechanics may replace worn-out parts like gears, seals, and clutches. They also clean and reassemble the transmission, ensuring that it functions smoothly. This process can be more cost-effective than a complete transmission replacement and helps maintain the performance of the vehicle.