Dodge RAM 1500 1998 Owner's Manual page 1858

DR
AUTOMATIC TRANSMISSION - 48RE (Continued)
CONDITION
SLIPS IN OVERDRIVE
FOURTH GEAR
DELAYED 3-4 UPSHIFT
(SLOW TO ENGAGE)
TORQUE CONVERTER
LOCKS UP IN SECOND
AND/OR THIRD GEAR
HARSH 1-2, 2-3, 3-4 OR
3-2 SHIFTS
POSSIBLE CAUSES
1. Fluid Level Low.
2. Overdrive Clutch Pack Worn.
3. Overdrive Piston Retainer Bleed
Orifice Blown Out.
4. Overdrive Piston or Seal
Malfunction.
5. 3-4 Shift Valve, Timing Valve or
Accumulator Malfunction.
6. Overdrive Unit Thrust Bearing
Failure.
7. O/D Check Valve/Bleed Orifice
Failure.
1. Fluid Level Low.
2. Throttle Valve Cable Mis-adjusted.
3. Overdrive Clutch Pack Worn/
Burnt.
4. TPS Faulty.
5. Overdrive Clutch Bleed Orifice
Plugged.
6. Overdrive Solenoid or Wiring
Shorted/Open.
7. Overdrive Excess Clearance.
8. O/D Check Valve Missing or
Stuck.
Lockup Solenoid, Relay or Wiring
Shorted/Open.
Lockup Solenoid Malfunction.
AUTOMATIC TRANSMISSION - 48RE
1. Add fluid and check for leaks.
2. Remove overdrive unit and rebuild clutch
pack.
3. Disassemble transmission, remove
retainer and replace orifice.
4. Remove overdrive unit. Replace seals if
worn. Replace piston if damaged. If piston
retainer is damaged, remove and
disassemble the transmission.
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.
6. Disassemble overdrive unit and replace
thrust bearing (NO. 1 thrust bearing is
between overdrive piston and clutch hub;
NO. 2 thrust bearing is between the
planetary gear and the direct clutch spring
plate; NO. 3 thrust bearing is between
overrunning clutch hub and output shaft).
7. Check for function/secure orifice insert in
O/D piston retainer.
1. Add fluid and check for leaks.
2. Adjust throttle valve cable.
3. Remove unit and rebuild clutch pack.
4. Test with DRB scan tool and replace as
necessary
5. Disassemble transmission and replace
orifice.
6. Test solenoid and check wiring for
loose/corroded connections or shorts/
grounds. Replace solenoid if faulty and
repair wiring if necessary.
7. Remove unit. Measure end play and
select proper spacer.
8. Check for presence of check valve.
Repair or replace as required.
Test solenoid, relay and wiring for
continuity, shorts or grounds. Replace
solenoid and relay if faulty. Repair wiring
and connectors as necessary.
Remove valve body and replace solenoid
assembly.
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CORRECTION