Shift Concern: Harsh 5-4 Shift

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

SHIFT CONCERN: HARSH 5-4 SHIFT

Possible Component	Reference/Action
275 - ROUTINE
Powertrain Control System
PCM, vehicle wiring harnesses, Shift Control Solenoid C, Pressure Control Solenoid C, Turbine Shaft Speed (TSS) sensor, Digital TR sensor, Transmission Fluid Temperature (TFT) sensor	Carry out on-board diagnostic tests. See INTRODUCTION - GASOLINE article for diagnosis and testing of the PCM. GO to PINPOINT TEST A , GO to PINPOINT TEST B , GO to Test C, GO to PINPOINT TEST D and GO to PINPOINT TEST E . Repair as required. Clear DTCs, road test and rerun on-board diagnostic test.
Incorrect Pressures
High/low pressures	Check pressure at Line and PC C taps. Carry out Line Pressure Test. Refer to SPECIAL TESTING PROCEDURES in this article.
Main Control
Screws not tightened to specification	Tighten to specification.
Separator plate damaged	Inspect for damage. If damaged, install a new separator plate.
Contamination	Disassemble and clean.
Valve/springs damaged, misassembled, missing, stuck or bore damaged	If damaged or parts are missing, install new main control assembly. If misassembled, reassemble correctly. DO NOT stone, file or sand valves. This will remove the anodized finish and may result in further main control or transmission damage.
Filter damaged, missing	Inspect for damage, repair as necessary.
OD Servo
Servo retaining screws damaged	Inspect for damage. Repair as necessary.
Seals (piston and cover) damaged	Inspect for damage. Repair as necessary.
OD Band
Band damaged	Inspect for damage. Repair as necessary.
Servo worn or damaged	Inspect for damage. Repair as necessary.
Not adjusted correctly	Inspect for damage. Repair as necessary.
Direct One-Way Clutch
Worn, damaged or assembled incorrectly	Inspect for damage. Repair as necessary.