Dodge Ram Truck 1500-2500-3500. Manual — part 248

REMOVAL

3.7L ENGINE

1. Place a drain pan under the oil cooler lines.

2. Disconnect the transmission oil cooler line quick-

connect fitting at the cooler outlet using the quick
connect release tool 6935. Plug the cooler lines to
prevent oil leakage.

3. Unsnap the transmission cooler tubes from the

radiator tank clips.

4. Remove the bolt attaching the transmission cooler

to the radiator.

5. Remove oil cooler from the vehicle. Take care not

to damage the radiator core or transmission cooler
tubes.

4.7L ENGINE

1. Place a drain pan under the oil cooler lines.

2. Disconnect the transmission oil cooler line quick-

connect fitting at the cooler outlet using the quick
connect release tool 6935 (Refer to 7 - COOLING/
TRANSMISSION

-

STANDARD

PROCEDURE).

Plug the cooler lines to prevent oil leakage.

3. Unsnap the transmission cooler tubes from the

radiator tank clips.

4. Remove the bolt attaching the transmission cooler

to the radiator.

5. Remove oil cooler from the vehicle. Take care not

to damage the radiator core or transmission cooler
tubes.

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TRANSMISSION

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5.7L ENGINE

1. Place a drain pan under the oil cooler lines.

2. Disconnect the transmission oil cooler line quick-

connect fitting at the cooler outlet using the quick
connect release tool 6935. Plug the cooler lines to
prevent oil leakage.

3. Unsnap the transmission cooler tubes from the

radiator tank clips.

4. Remove the bolt attaching the transmission cooler

to the radiator.

5. Remove oil cooler from the vehicle. Take care not

to damage the radiator core or transmission cooler
tubes.

AIR TO OIL COOLER - 5.9L DIESEL

1. Remove

Charge

Air

Cooler

(Refer

to

11

-

EXHAUST SYSTEM/TURBOCHARGER SYSTEM/
CHARGE

AIR

COOLER

AND

PLUMBING

-

REMOVAL).

2. Place a drain pan under the oil cooler.

3. Raise the vehicle.

4. Disconnect the oil cooler quick-connect fittings from

the transmission lines.

5. Remove the charge air cooler-to-oil cooler bolt.

6. Remove two mounting nuts.

7. Remove the oil cooler and line assembly towards

the front of vehicle. Cooler must be rotated and
tilted into position while removing.

REMOVAL - WATER TO OIL COOLER

CAUTION: If a leak should occur in the water-to-oil cooler mounted to the side of the engine block, engine
coolant may become mixed with transmission fluid. Transmission fluid may also enter engine cooling sys-
tem. Both cooling system and transmission should be drained and inspected in case of oil cooler leakage.

1. Disconnect both battery negative cables.

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TRANSMISSION

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2. Remove starter (Refer to 8 - ELECTRICAL/STARTING/STARTER MOTOR - REMOVAL).

3. Drain cooling system (Refer to 7 - COOLING - STANDARD PROCEDURE).

4. Disconnect coolant lines from cooler.

NOTE: Use a back-up wrench on the transmission cooler fittings to prevent damage to the cooler.

5. Disconnect transmission oil lines from cooler. Plug cooler lines to prevent oil leakage.

6. Remove cooler bracket to transmission adapter bolt.

7. Remove two cooler bracket to block bolts.

8. Remove cooler assembly from vehicle.

8.3L ENGINE

1. Place a drain pan under the oil cooler.

2. Raise the vehicle.

3. Disconnect the oil cooler quick-connect fittings from

the transmission lines.

4. Remove cooler mounting bolts.

5. Remove the oil cooler and line assembly towards

the front of vehicle. Cooler must be rotated and
tilted into position while removing.

DISASSEMBLY - 5.9L DIESEL - 8.3L
ENGINES

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TRANSMISSION

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NOTE: The transmission oil cooler uses an inter-
nal thermostat to control transmission oil flow
through the cooler. This thermostat is servicable.

1. Remove the transmission oil cooler (Refer to 7 -

COOLING/TRANSMISSION/TRANS

COOLER

-

REMOVAL).

2. Remove the snap ring retaining the thermostat end

plug.

3. Remove the end plug, thermostat and spring from

transmission oil cooler.

ASSEMBLY - 5.9L DIESEL - 8.3L ENGINES

1. Throughly clean the thermostat bore on the trans-

mission oil cooler.

2. Install the new spring, thermostat, end plug and

snap ring.

3. Install the transmission oil cooler (Refer to 7 -

COOLING/TRANSMISSION/TRANS

COOLER

-

INSTALLATION).

INSTALLATION

3.7L ENGINE

1. Position the transmission cooler tubes to the front

of the radiator by sliding brackets into slots on radi-
ator inlet tank.

2. Snap the transmission cooler tubes into the clips

on the side of the radiator tank.

3. Install

the

transmission

cooler

attaching

bolt.

Tighten the bolt to 16 N·m (140 in. lbs.).

4. Inspect the quick connect fittings for debris and

install the quick connect fitting on the cooler tube
until an audible “click” is heard. Pull apart the con-
nection to verify proper installation and install the
secondary latches.

5. Start the engine and check all fittings for leaks.

6. Check the fluid level in the automatic transmission.

Refer

to

the

appropriate

transmission

section

(Refer to 21 - TRANSMISSION/TRANSAXLE/AU-
TOMATIC - 45RFE/545RFE/FLUID - STANDARD
PROCEDURE) or (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 46RE/FLUID - STAN-
DARD PROCEDURE).

DR/DH

TRANSMISSION

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