Harsh 3-2 Downshift
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: valve body (1-2 shift valve stuck or damaged), incorrectly tightened valve body bolts (cross-leaks), intermediate brake drum outer diameter out of specification, or intermediate band or servo damaged or out of adjustment.