The Toyota A750E/F five-speed transmission is built for durability but can experience wear in the valve body's critical hydraulic circuits over time. Common issues include main line pressure and main boost pressure, which are crucial for ensuring consistent performance and system efficiency. Secondary pressure and lube pressure may deteriorate, increasing the risk of overheating or insufficient lubrication. Wear in torque converter apply and release pressure can lead to slipping or shuddering during operation. Additionally, solenoid regulation pressure and accumulator pressure issues may result in delayed responses or inconsistent shifts.