Shift Concerns: Harsh 4-3 Shift (Automatic)

SHIFT CONCERNS: HARSH 4-3 SHIFT (AUTOMATIC) - DIAGNOSTIC ROUTINES

Possible Component	Reference/Action
247 - ELECTRICAL ROUTINE
Solenoid Body
Incorrect solenoid body strategy data stored in the PCM	Verify solenoid body strategy data stored in the PCM, download new identification and strategy as necessary. Refer to SOLENOID BODY STRATEGY .
347 - HYDRAULIC/MECHANICAL ROUTINE
Main Control Valve Body
Bolts out of torque specification	Tighten bolts to specification.
Gaskets and separator plate - damaged, off location	Inspect for damage. Install new as required.
O/D regulator and boost valves, springs, clips - loose, stuck, binding, missing, misassembled	Inspect for damage. Repair or install new as required.
Direct regulator and boost valves, springs, clips - loose, stuck, binding, missing, misassembled, clutch failed off	Inspect for damage. Repair or install new as required.
Shift Solenoid B (SSB) or Shift Solenoid D (SSD) not functioning correctly	Activate solenoid using scan tool. Refer to OUTPUT STATE CONTROL (OSC) MODE . Go To PINPOINT TEST A . Install a new solenoid body. Refer to SOLENOID BODY ASSEMBLY . Download a new solenoid body strategy into the PCM. Refer to SOLENOID BODY STRATEGY .
O/D Clutch Assembly
Seals - damaged	Inspect for damage. Install new as required.
Piston - damaged	Inspect for damage. Install new as required.
Friction - damaged, worn	Inspect for damage. Install new as required.
Cylinder hub - damaged	Inspect for damage. Install new as required.
Return spring assembly - damaged	Inspect for damage. Install new as required.
Direct Clutch Assembly
Seals - damaged	Inspect for damage. Install new as required.
Piston - damaged	Inspect for damage. Install new as required.
Friction - damaged, worn	Inspect for damage. Install new as required.
Cylinder hub - damaged	Inspect for damage. Install new as required.
Return spring assembly - damaged	Inspect for damage. Install new as required.