Dodge Ram Truck 1500-2500-3500. Manual — part 1682

6. Position the oil pump valve body (6) onto the locating dowels.

7. Seat the two oil pump halves together and install all bolts finger tight.

8. Torque all bolts down slowly starting in the center and working outward. The correct torque is 4.5 N·m (40

in.lbs.).

9. Verify that the oil pump gears rotate freely and smoothly.

10. Position the reaction shaft support (5) onto the oil pump valve body (6).

11. Install and torque the bolts to hold the reaction shaft support (5) to the oil pump valve body (6). The correct

torque is 12 N·m (105 in.lbs.).

SEAL-OIL PUMP FRONT

REMOVAL

1. Remove transmission from the vehicle.

2. Remove the torque converter from the transmission.

3. Using a screw mounted in a slide hammer, remove the oil pump front seal.

Oil Pump Assembly

1 - PUMP HOUSING

4 - SEAL RING (5)

2 - SEAL

5 - REACTION SHAFT SUPPORT

3 - OIL FILTER SEAL

6 - PUMP VALVE BODY

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INSTALLATION

1. Clean seal bore of the oil pump of any residue or

particles from the original seal.

2. Install new oil seal in the oil pump housing using

Seal Installer C-3860-A (1).

SENSOR-OUTPUT SPEED

DESCRIPTION

The Input and Output Speed Sensors are two-wire magnetic pickup devices that generate AC signals as rotation
occurs. They are mounted in the left side of the transmission case and are considered primary inputs to the Trans-
mission Control Module (TCM).

OPERATION

The Input Speed Sensor provides information on how fast the input shaft is rotating. As the teeth of the input clutch
hub pass by the sensor coil, an AC voltage is generated and sent to the TCM. The TCM interprets this information
as input shaft rpm.

The Output Speed Sensor generates an AC signal in a similar fashion, though its coil is excited by rotation of the
rear planetary carrier lugs. The TCM interprets this information as output shaft rpm.

The TCM compares the input and output speed signals to determine the following:

•

Transmission gear ratio

•

Speed ratio error detection

•

CVI calculation

The TCM also compares the input speed signal and the engine speed signal to determine the following:

•

Torque converter clutch slippage

•

Torque converter element speed ratio

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REMOVAL

1. Raise vehicle.

2. Place a suitable fluid catch pan under the transmis-

sion.

3. Remove the wiring connector from the output

speed sensor (1).

4. Remove the bolt holding the output speed sensor

(1) to the transmission case.

5. Remove the output speed sensor (1) from the

transmission case.

INSTALLATION

1. Install the output speed sensor (1) into the trans-

mission case.

2. Install the bolt to hold the output speed sensor (1)

into the transmission case. Tighten the bolt to 11.9
N·m (105 in.lbs.).

3. Install the wiring connector onto the output speed

sensor (1).

4. Verify the transmission fluid level. Add fluid as nec-

essary.

5. Lower vehicle.

SENSOR-LINE PRESSURE

DESCRIPTION

The TCM utilizes a closed-loop system to control transmission line pressure. The system contains a variable force
style solenoid, the Pressure Control Solenoid, mounted on the side of the solenoid and pressure switch assembly.
The solenoid is duty cycle controlled by the TCM to vent the unnecessary line pressure supplied by the oil pump
back to the sump. The system also contains a variable pressure style sensor, the Line Pressure Sensor, which is a
direct input to the TCM. The line pressure solenoid monitors the transmission line pressure and completes the feed-
back loop to the TCM. The TCM uses this information to adjust its control of the pressure control solenoid to
achieve the desired line pressure.

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OPERATION

The TCM calculates the desired line pressure based upon inputs from the transmission and engine. The TCM cal-
culates the torque input to the transmission and uses that information as the primary input to the calculation. The
line pressure is set to a predetermined value during shifts and when the transmission is in the PARK and NEUTRAL
positions. This is done to ensure consistent shift quality. During all other operation, the actual line pressure is com-
pared to the desired line pressure and adjustments are made to the pressure control solenoid duty cycle.

REMOVAL

1. Raise vehicle.

2. Place a suitable fluid catch pan under the transmis-

sion.

3. Remove the wiring connector from the line pres-

sure sensor (2).

4. Remove the bolt holding the line pressure sensor

(2) to the transmission case.

5. Remove the line pressure sensor (2) from the

transmission case.

INSTALLATION

1. Install the line pressure sensor (2) into the trans-

mission case.

2. Install the bolt to hold the line pressure sensor (2)

into the transmission case. Tighten the bolt to 11.9
N·m (105 in.lbs.).

3. Install the wiring connector onto the line pressure

sensor (2).

4. Verify the transmission fluid level. Add fluid as nec-

essary.

5. Lower vehicle.

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