Dodge RAM TRUCK 1500 1995 Service Manual page 1404

B R — — 42RH/46RH/47RH TRANSMISSION DIAGNOSIS AND TESTING 21 - 121
TRANSMISSION DIAGNOSIS
CONDITION
P O S S I B L E C A U S E S CORRECTION
NO LOW GEAR (MOVES IN
2ND OR 3RD GEAR ONLY)
1. Governor valve sticking in
partially open position.
2. Valve body malfunction.
3. Front servo piston cocked in
bore.
4. Front band linkage malfunction.
5. Incorrect throttle or gearshift
linkage or cable adjustment.
1. Remove governor; clean, inspect, and
repair as required.
2. Remove, clean, and inspect. Look for
sticking 1-2 valve, 2-3 valve, governor
plug, or broken springs.
3. Inspect servo and repair as required.
4. Inspect linkage and look for bind in
linkage.
5. Adjust linkage or cable.
CREEPS IN NEUTRAL 1. Gearshift linkage or cable out of
adjustment.
2. Valve body malfunction (warped
body, cross leakage).
3. Transmission clutch dragging.
4. Converter clutch dragging.
1. Adjust linkage or cable.
2. Perform hydraulic pressure test to
determine cause and repair as required.
3. Air pressure check operation of clutches
and repair as required.
4. Replace converter.
DRAGS OR LOCKS UP
1. Front or rear band out of adjustment.
2. Servo band or linkage malfunction
(i.e., binding linkage, warped band,
servo piston stuck.
3. Dragging clutch (does not release
fully).
4. Broken or seized planetary gears.
5. Overrunning clutch worn, broken,
or seized.
1. Adjust bands.
2. Air pressure check servo operation and
repair as required.
3. Air pressure check clutch operation and
repair as required.
4. Remove, inspect, and repair as required
(look for debris in oil pan).
5. Remove and inspect clutch, repair as
required.
GROWLING, GRATING,
OR SCRAPING NOISES
1. Planetary gear set broken or
seized.
2. Overrunning clutch worn, seized,
or broken.
3. Oil pump components scored,
binding, or broken.
4. Output shaft bearing or bushing
damaged.
5. Faulty clutch operation.
6. Governor support (park gear)
binding or seal rings broken.
7. Front and rear bands out of
adjustment.
1. Check for debris in oil pan and repair as
required.
2. Inspect and check for debris in oil pan;
repair as required.
3. Remove, inspect, and repair as required.
4. Remove, inspect, and repair as required.
5. Perform air pressure check and repair as
required.
6. Remove, inspect, and repair as required.
7. Adjust bands.
BUZZING NOISE 1. Low fluid level.
2. Air being drawn into pump suction
passages.
3. Overrunning clutch damaged.
1. Add fluid and check for leaks.
2. Check pump for porous casting, scores o
mating surfaces, and excess rotor clearance;
repair as required.
3. Replace clutch.
J9521-136