No Fourth Gear

1. 2-3 shift valve stuck.

2. Solenoid B malfunctioning.

3. Quad driver module failure.

4. Overrun clutch reaction plates splines.

5. Fourth clutch components:

a. Cup plug or bolt loose, broken or missing.

b. Piston or spring assembly jammed.

c. Seals nicked or cut.

d. Friction or reaction plates worn or burned.