CONTENTS
MOTION
DRIVELINE

AUTOMATIC TRANSMISSION SHIFTS INCORRECTLY

CONDITION(S)

• AUTOMATIC TRANSMISSION SHIFTS INCORRECTLY
• GEARS CHANGE TOO EARLY OR LATE GIVEN ENGINE LOAD CONDITIONS
• ENGINE WILL LUG IN HIGH GEAR OR RACE IN LOW GEAR

POTENTIAL CAUSE(S)

CHECK THESE FIRST:

1. LOW TRANSMISSION FLUID LEVEL
Add transmission fluid level as necessary.

2. DAMAGED, CLOGGED OR LEAKING VACUUM LINE TO VACUUM MODULATOR
Have vacuum line professionally repaired or replaced.

3. FAULTY VACUUM MODULATOR VALVE OR DIAPHRAGM
Have vacuum modulator professionally repaired.

4. DAMAGED OR WORN GOVERNOR
Have governor professionally replaced.

CHECK THESE NEXT:

5. FAULTY HYDRAULIC VALVES, SERVOS OR PISTONS
Have valve body professionally serviced.

6. HIGH TRANSMISSION FLUID LEVEL
Remove transmission fluid level if necessary.

7. DIRTY OR STICKING VALVE BODY
Have valve body professionally cleaned.

8. IMPROPER SPEEDOMETER GEAR INSTALLED
Have correct speedometer gear professionally replaced.

CHECK THESE LAST:

9. IMPROPER INTERNAL CLUTCH OR BAND
Have internal clutch or band professionally replaced.

10. FAULTY SPARK PLUG OR SPARK PLUG WIRE
Replace spark plug and/or plug wire.

11. FAULTY KICKDOWN ROD OR CABLE
Have kickdown rod or cable professionally replaced.

CONTENTS
AUTOMATIC TRANSMISSION SLIPS OR JERKS
MANUAL TRANSMISSION JUMPS OUT OF GEAR