Dodge Ram Truck 1500-2500-3500. Manual — part 1802

4. Install the two screws to hold the TRS to the

mounting bracket. Tighten the screws to 5 N·m (45
in.lbs.).

5. Verify proper sensor operation (1-4).

6. Move the transmission manual shaft lever to the

PARK position.

7. Connect TRS wiring connector to the TRS and

lower vehicle.

8. Refill the transmission fluid to the correct level.

SENSOR-TRANSMISSION TEMPERATURE

DESCRIPTION

Transmission fluid temperature readings are supplied
to the transmission control module by the thermistor.
The temperature readings are used to control engage-
ment of the fourth gear overdrive clutch, the converter
clutch, and governor pressure. Normal resistance
value for the thermistor at room temperature is
approximately 2000 ohms.

The thermistor is part of the governor pressure sensor
assembly (2) and is immersed in transmission fluid at
all times.

OPERATION

The PCM prevents engagement of the converter clutch and overdrive clutch, when fluid temperature is below
approximately 10°C (50°F).

If fluid temperature exceeds 126°C (260°F), the PCM causes a 4-3 downshift and engage the converter clutch.
Engagement is according to the third gear converter clutch engagement schedule.

The Tow/Haul lamp in the instrument panel illuminates when the shift back to third occurs. The transmission will not
allow fourth gear operation until fluid temperature decreases to approximately 110°C (230°F).

1 - NEUTRAL CONTACT
2 - MANUAL LEVER AND SENSOR PLUNGER IN REVERSE
POSITION
3 - PARK CONTACT
4 - TRANSMISSION RANGE SENSOR

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BODY-VALVE

DESCRIPTION

The valve body consists of a cast aluminum valve body, a separator plate, and transfer plate. The valve body con-
tains valves and check balls that control fluid delivery to the torque converter clutch, bands, and frictional clutches.
The valve body contains the following components.

By adjusting the spring pressure acting on the regulator valve, transmission line pressure can be adjusted.

•

Regulator valve (2)

•

Switch valve (3)

•

Regulator valve spring (4)

•

Kickdown valve (5)

•

Kickdown detent (6)

•

Throttle valve and spring (7)

•

Manual valve (8)

•

1-2 Governor plug (9)

•

Throttle pressure plug (11)

•

2-3 Governor plug (12)

•

Shuttle valve primary spring (13)

Upper Housing Control Valve Locations

1 - UPPER HOUSING

8 - MANUAL VALVE

2 - REGULATOR VALVE

9 - 1-2 GOVERNOR PLUG

3 - SWITCH VALVE

10 - GOVERNOR PLUG COVER

4 - REGULATOR VALVE SPRING

11 - THROTTLE PLUG

5 - KICKDOWN VALVE

12 - 2-3 GOVERNOR PLUG

6 - KICKDOWN DETENT

13 - SHUTTLE VALVE PRIMARY SPRING

7 - THROTTLE VALVE AND SPRING

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•

Boost Valve (3)

•

Boost valve plug (4)

•

Shuttle valve (9)

•

Shuttle valve throttle plug (12)

Shuttle and Boost Valve Locations

1 - SPRING

8 - SHUTTLE VALVE COVER

2 - RETAINER

9 - SHUTTLE VALVE

3 - BOOST VALVE

10 - SHUTTLE VALVE PRIMARY SPRING

4 - BOOST VALVE PLUG

11 - GOVERNOR PLUG COVER

5 - SPRING GUIDES

12 - THROTTLE PLUG

6 - E-CLIP

13 - UPPER HOUSING

7 - SHUTTLE VALVE SECONDARY SPRING

14 - BOOST VALVE COVER

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AUTOMATIC TRANSMISSION - 48RE - SERVICE INFORMATION

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•

1-2 shift valve (2)

•

1-2 control valve

•

2-3 shift valve

•

2-3 throttle plug

•

Throttle pressure plug

•

Limit valve and spring

Upper Housing Shift Valve and Pressure Plug Locations

1 - UPPER HOUSING

7 - LIMIT VALVE AND SPRING

2 - 1-2 SHIFT VALVE AND SPRING

8 - RETAINER

3 - 2-3 SHIFT VALVE AND SPRING

9 - 1-2 SHIFT CONTROL VALVE AND SPRING

4 - 2-3 THROTTLE PLUG

10 - PRESSURE PLUG COVER

5 - LIMIT VALVE HOUSING

11 - PLUG SLEEVE

6 - LIMIT VALVE COVER

12 - THROTTLE PRESSURE SPRING AND PLUG

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