Transmission Overheating
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2003 Mazda B4000, 2003 Mazda B3000, 2003 Mazda B2300, 2002 Mazda B4000, and 2002 Mazda B3000. However, it is still accessible from the selected car via links, so may be relevant.
Check the following: improper fluid level, high or low line pressure, valve body (TCC solenoid, or thermostat by-pass valve/cooler limit valve stuck or damaged), TCC assembly (seized one-way clutch or excessive slip), or cooler line restriction.