For 1990-2009 cars

Problem | Action
--- | ---
Shift select cable is out of adjustment, binding or damaged | Adjust or replace the shift select cable.
Manual valve is binding or sticking | Inspect the valve body.
1-2 shift valve is binding or sticking | Inspect the valve body.
2-3 shift valve is binding or sticking | Inspect the valve body.
Valve springs are broken or distorted | Inspect the valve body.
Valve body casting is damaged or porous | Inspect the valve body.
Intermediate servo piston is binding or sticking | Inspect the intermediate servo piston.
Intermediate servo piston seals are cut or damaged | Inspect the intermediate servo piston seals.
Intermediate servo piston rod is binding | Inspect the intermediate servo piston rod.
2nd brake band is worn or out of alignment | Inspect the 2nd brake band.
1st-reverse brake clutch disc worn | Replace the 1st-reverse brake clutch discs.
1st-reverse brake piston or seal leaking or damaged | Inspect the 1st-reverse brake piston.
One-way clutch not holding or damaged | Inspect the one-way clutch.