Shift Timing Early or Late

SHIFT TIMING EARLY/LATE (Some/All)
1. No power to Powertrain Control Module (PCM), keep alive memory erased from PCM.
2. Poor vehicle performance.
3. Tire size or axle ratio change.
4. Improper band/clutch application pressure.
5. Main control assembly gaskets damaged or bolt out of torque.
6. Main control separator plate damaged.
7. Main control solenoid stuck or damaged.