Dodge Durango (DN). Manual — part 88

CONDITION

POSSIBLE CAUSES

CORRECTION

SLIPS IN REVERSE ONLY

1. Fluid Level Low.

1. Add fluid and check for leaks.

2. Gearshift Linkage Misadjusted.

2. Adjust linkage.

3. Rear Band Misadjusted.

3. Adjust band.

4. Rear Band Worn.

4. Replace as required.

5. Overdrive Direct Clutch Worn.

5. Disassemble overdrive. Repair as
needed.

6. Hydraulic Pressure Too Low.

6. Perform hydraulic pressure tests to
determine cause.

7. Rear Servo Leaking.

7. Air pressure check clutch-servo operation
and repair as required.

8. Band Linkage Binding.

8. Inspect and repair as required.

SLIPS IN FORWARD
DRIVE RANGES

1. Fluid Level Low.

1. Add fluid and check for leaks.

2. Fluid Foaming.

2. Check for high oil level, bad pump
gasket or seals, dirt between pump halves
and loose pump bolts. Replace pump if
necessary.

3. Throttle Linkage Misadjusted.

3. Adjust linkage.

4. Gearshift Linkage Misadjusted.

4. Adjust linkage.

5. Rear Clutch Worn.

5. Inspect and replace as needed.

6. Low Hydraulic Pressure Due to
Worn Pump, Incorrect Control
Pressure Adjustments, Valve Body
Warpage or Malfunction, Sticking,
Leaking Seal Rings, Clutch Seals
Leaking, Servo Leaks, Clogged Filter
or Cooler Lines

6. Perform hydraulic and air pressure tests
to determine cause.

7. Rear Clutch Malfunction, Leaking
Seals or Worn Plates.

7. Air pressure check clutch-servo operation
and repair as required.

8. Overrunning Clutch Worn, Not
Holding (Slips in 1 Only).

8. Replace Clutch.

SLIPS IN LOW GEAR “D”
ONLY, BUT NO IN 1
POSITION

Overrunning Clutch Faulty.

Replace overrunning clutch.

GROWLING, GRATING OR
SCRAPING NOISES

1. Drive Plate Broken.

1. Replace.

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DIAGNOSIS AND TESTING (Continued)

CONDITION

POSSIBLE CAUSES

CORRECTION

2. Torque Converter Bolts Hitting
Dust Shield.

2. Dust shield bent. Replace or repair.

3. Planetary Gear Set Broken/
Seized.

3. Check for debris in oil pan and repair as
required.

4. Overrunning Clutch Worn/Broken.

4. Inspect and check for debris in oil pan.
Repair as required.

5. Oil Pump Components Scored/
Binding.

5. Remove, inspect and repair as required.

6. Output Shaft Bearing or Bushing
Damaged.

6. Remove, inspect and repair as required.

7. Clutch Operation Faulty.

7. Perform air pressure check and repair as
required.

8. Front and Rear Bands
Misadjusted.

8. Adjust bands.

DRAGS OR LOCKS UP

1. Fluid Level Low.

1. Check and adjust level.

2. Clutch Dragging/Failed

2. Air pressure check clutch operation and
repair as required.

3. Front or Rear Band Misadjusted.

3. Adjust bands.

4. Case Leaks Internally.

4. Check for leakage between passages in
case.

5. Servo Band or Linkage
Malfunction.

5. Air pressure check servo operation and
repair as required.

6. Overrunning Clutch Worn.

6. Remove and inspect clutch. Repair as
required.

7. Planetary Gears Broken.

7. Remove, inspect and repair as required
(look for debris in oil pan).

8. Converter Clutch Dragging.

8. Check for plugged cooler. Perform flow
check. Inspect pump for excessive side
clearance. Replace pump as required.

NO 4-3 DOWNSHIFT

1. Circuit Wiring and/or Connectors
Shorted.

1. Test wiring and connectors with test lamp
and volt/ohmmeter. Repair wiring as
necessary. Replace connectors and/or
harnesses as required.

2. PCM Malfunction.

2. Check PCM operation with DRB scan
tool. Replace PCM only if faulty.

3. TPS Malfunction

3. Check TPS with DRB scan tool at PCM.

4. Lockup Solenoid Not Venting.

4. Remove valve body and replace solenoid
assembly if plugged or shorted.

5. Overdrive Solenoid Not Venting.

5. Remove valve body and replace solenoid
if plugged or shorted.

6. Valve Body Valve Sticking.

6. Repair stuck 3-4 shift valve or lockup
timing valve.

NO 4-3 DOWNSHIFT
WHEN CONTROL SWITCH
IS TURNED OFF

1. Control Switch Open/Shorted.

1. Test and replace switch if faulty.

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DIAGNOSIS AND TESTING (Continued)

CONDITION

POSSIBLE CAUSES

CORRECTION

2. Overdrive Solenoid Connector
Shorted.

2. Test solenoids and replace if seized or
shorted.

3. PCM Malfunction.

3. Test with DRB scan tool. Replace PCM if
faulty.

4. Valve Body Stuck Valves.

4. Repair stuck 3-4, lockup or lockup timing
valve.

CLUNK NOISE FROM
DRIVELINE ON CLOSED
THROTTLE 4-3
DOWNSHIFT

1. Transmission Fluid Low.

1. Add Fluid.

2. Throttle Cable Misadjusted.

2. Adjust cable.

3. Overdrive Clutch Select Spacer
Wrong Spacer.

3. Replace overdrive piston thrust plate
spacer.

3-4 UPSHIFT OCCURS
IMMEDIATELY AFTER 2-3
SHIFT

1. Overdrive Solenoid Connector or
Wiring Shorted.

1. Test connector and wiring for loose
connections, shorts or ground and repair as
needed.

2. TPS Malfunction.

2. Test TPS and replace as necessary.
Check with DRB scan tool.

3. PCM Malfunction.

3. Test PCM with DRB scan tool and
replace controller if faulty.

4. Overdrive Solenoid Malfunction.

4. Replace solenoid.

5. Valve Body Malfunction.

5. Remove, disassemble, clean and inspect
valve body components. Make sure all
valves and plugs slide freely in bores.
Polish valves with crocus cloth if needed.

WHINE/NOISE RELATED
TO ENGINE SPEED

1. Fluid Level Low.

1. Add fluid and check for leaks.

2. Shift Cable Incorrect Routing.

2. Check shift cable for correct routing.
Should not touch engine or bell housing.

NO 3-4 UPSHIFT

1. Dash O/D Switch In OFF Position.

1. Turn control switch to ON position.

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DIAGNOSIS AND TESTING (Continued)

CONDITION

POSSIBLE CAUSES

CORRECTION

2. Overdrive Circuit Fuse Blown.

2. Replace fuse. Determine why fuse failed
and repair as necessary (i.e., shorts or
grounds in circuit).

3. O/D Switch Wire Shorted/Open
Cut.

3. Check wires/connections with 12V test
lamp and voltmeter. Repair damaged or
loose wire/connection as necessary.

4. Distance or Coolant Sensor
Malfunction.

4. Check with DRB scan tool and repair or
replace as necessary.

5. TPS Malfunction.

5. Check with DRB scan tool and replace if
necessary.

6. Neutral Switch to PCM Wire
Shorted/Cut.

6. Test switch as described in service
section and replace if necessary. Engine no
start.

7. PCM Malfunction.

7. Check with DRB scan tool and replace if
necessary.

8. Overdrive Solenoid Shorted/Open.

8. Replace solenoid if shorted or open and
repair loose or damaged wires (DRB scan
tool).

9. Solenoid Feed Orifice in Valve
Body Blocked.

9. Remove, disassemble, and clean valve
body thoroughly. Check feed orifice.

10. Overdrive Clutch Failed.

10. Disassemble overdrive and repair as
needed.

11. Hydraulic Pressure Low.

11. Pressure test transmission to determine
cause.

12. Valve Body Valve Stuck.

12. Repair stuck 3-4 shift valve, 3-4 timing
valve.

13. O/D Piston Incorrect Spacer.

13. Remove unit, check end play and install
correct spacer.

14. Overdrive Piston Seal Failure.

14. Replace both seals.

15. O/D Check Valve/Orifice Failed.

15. Check for free movement and secure
assembly (in piston retainer). Check ball
bleed orifice.

SLIPS IN OVERDRIVE
FOURTH GEAR

1. Fluid Level Low.

1. Add fluid and check for leaks.

2. Overdrive Clutch Pack Worn.

2. Remove overdrive unit and rebuild clutch
pack.

3. Overdrive Piston Retainer Bleed
Orifice Blown Out.

3. Disassemble transmission, remove
retainer and replace orifice.

4. Overdrive Piston or Seal
Malfunction.

4. Remove overdrive unit. Replace seals if
worn. Replace piston if damaged. If piston
retainer is damaged, remove and
disassemble the transmission.

5. 3-4 Shift Valve, Timing Valve or
Accumulator Malfunction.

5. Remove and overhaul valve body.
Replace accumulator seals. Make sure all
valves operate freely in bores and do not
bind or stick. Make sure valve body screws
are correctly tightened and separator plates
are properly positioned.

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DIAGNOSIS AND TESTING (Continued)