For 1990-2009 cars

Check | Causes
--- | ---
DEFINITION: A large engine RPM is noted in fourth gear or no vehicle forward speed increase. Shifts into fourth gear are soft or do not occur.
Control Valve Body Accumulator Assembly |

• | 3-4 shift valve stuck applied

• | 3-4 shift control valve stuck applied

Direct and Reverse Clutch |

• | Damaged or worn piston (406)

• | Damaged or worn clutch plates

• | Damaged ball check valve (405)