Dodge RAM 1500 1998 Owner's Manual page 1855

21 - 152 AUTOMATIC TRANSMISSION - 48RE
AUTOMATIC TRANSMISSION - 48RE (Continued)
CONDITION
GROWLING, GRATING OR
SCRAPING NOISES
DRAGS OR LOCKS UP
NO 4-3 DOWNSHIFT
POSSIBLE CAUSES
1. Drive Plate Broken.
2. Torque Converter Bolts Hitting
Dust Shield.
3. Planetary Gear Set Broken/
Seized.
4. Overrunning Clutch Worn/Broken.
5. Oil Pump Components Scored/
Binding.
6. Output Shaft Bearing or Bushing
Damaged.
7. Clutch Operation Faulty.
8. Front and Rear Bands Mis-
adjusted.
1. Fluid Level Low.
2. Clutch Dragging/Failed
3. Front or Rear Band Mis-adjusted.
4. Case Leaks Internally.
5. Servo Band or Linkage
Malfunction.
6. Overrunning Clutch Worn.
7. Planetary Gears Broken.
8. Converter Clutch Dragging.
1. Circuit Wiring and/or Connectors
Shorted.
2. PCM Malfunction.
3. TPS Malfunction
4. Lockup Solenoid Not Venting.
5. Overdrive Solenoid Not Venting.
6. Valve Body Valve Sticking.
CORRECTION
1. Replace.
2. Dust shield bent. Replace or repair.
3. Check for debris in oil pan and repair as
required.
4. Inspect and check for debris in oil pan.
Repair as required.
5. Remove, inspect and repair as required.
6. Remove, inspect and repair as required.
7. Perform air pressure check and repair as
required.
8. Adjust bands.
1. Check and adjust level.
2. Air pressure check clutch operation and
repair as required.
3. Adjust bands.
4. Check for leakage between passages in
case.
5. Air pressure check servo operation and
repair as required.
6. Remove and inspect clutch. Repair as
required.
7. Remove, inspect and repair as required
(look for debris in oil pan).
8. Check for plugged cooler. Perform flow
check. Inspect pump for excessive side
clearance. Replace pump as required.
1. Test wiring and connectors with test lamp
and volt/ohmmeter. Repair wiring as
necessary. Replace connectors and/or
harnesses as required.
2. Check PCM operation with DRB scan
tool. Replace PCM only if faulty.
3. Check TPS with DRB scan tool at PCM.
4. Remove valve body and replace solenoid
assembly if plugged or shorted.
5. Remove valve body and replace solenoid
if plugged or shorted.
6. Repair stuck 3-4 shift valve or lockup
timing valve.
DR