Valve Body and Pressure Switch Replacement. Pontiac Firebird 1998

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1998 🢒 Firebird 🢒 Engine 🢒 Engine Controls - 5.7L 🢒 Valve Body and Pressure Switch Replacement

Removal Procedure

Remove the transmission oil pan and filter. Refer to Automatic Transmission Fluid and Filter Replacement .
Disconnect the internal wiring harness electrical connectors from the following components:

•	Transmission pressure switch (1)

•	1-2 shift control solenoid (2)

•	2-3 shift control solenoid (3)

•	Pressure control solenoid (4)

•	TCC PWM solenoid (5)

•	3-2 control solenoid (6)

Remove the TCC PWM solenoid retainer.
Remove the TCC PWM solenoid in order to access one of the TCC solenoid retaining bolts.

Remove the TCC solenoid retaining bolts and the valve body bolts which retain the internal wiring harness.

Remove the TCC solenoid (with O-ring seal) and wiring harness from the control valve body.

Reposition the harness to the side of the transmission case.

Remove the control valve body bolts which retain the transmission fluid pressure switch to the control valve body.
Remove the transmission fluid pressure switch.

Inspect the transmission fluid pressure switch for damage or debris.

Remove the manual detent spring retaining bolt.
Remove the manual detent spring.
Inspect the manual detent spring for cracks or damage.

Remove the remaining control valve body bolts.
Carefully begin to lower the control valve body down from the transmission case, disconnect the manual valve link, then remove the control valve body from the transmission case.
Inspect the control valve body. Refer to the Transmission/Transaxle/Transfer Case Unit Repair Manual for the control valve body cleaning, inspection and repair procedures.

Installation Procedure

Install the control valve body to the transmission case and connect the manual valve link to the inside detent lever.

Verify that the manual valve link (3) is installed properly to the inside detent lever (1) and the manual valve (2).

Important: When installing bolts throughout this procedure, be sure to use the correct size bolt and length in the correct location as specified.

Install but do not tighten the control valve body bolts which retain only the valve body directly.

Each numbered bolt location corresponds to a specific bolt size and length, as indicated by the following:

•	M6 X 1.0 X 65.0 (1)

•	M6 X 1.0 X 54.4 (2)

•	M6 X 1.0 X 47.5 (3)

•	M6 X 1.0 X 35.0 (4)

•	M6 X 1.0 X 20.0 (5)

•	M6 X 1.0 X 12.0 (6)

•	M6 X 1.0 X 18.0 (7)

Install the manual detent spring.
Install but do not tighten the manual detent spring retaining bolt.

Install the transmission fluid pressure switch.
Install but do not tighten the control valve body bolts which retain the transmission fluid pressure switch to the control valve body.

Install the wiring harness and TCC solenoid with a new O-ring seal to the valve body.

Install but do not tighten the valve body bolts which retain the internal wiring harness.
Install the TCC solenoid retaining bolts.

Tighten
Tighten the TCC solenoid retaining bolts to 11 N·m (97 lb in).

Install the TCC PWM solenoid to the control valve body.
Install the TCC PWM solenoid retainer.

Notice: Torque valve body bolts in a spiral pattern starting from the center. If the bolts are torqued at random, valve bores may be distorted and inhibit valve operation.

Tighten the control valve body bolts in a spiral pattern starting from the center, as indicated by the arrows.

Tighten
Tighten the control valve body bolts (in sequence) to 11 N·m (97 lb in).

Connect the internal wiring harness electrical connectors to the following components:

•	Transmission pressure switch (1)

•	1-2 shift control solenoid (2)

•	2-3 shift control solenoid (3)

•	Pressure control solenoid (4)

•	TCC PWM solenoid (5)

•	3-2 control solenoid (6)

Install the transmission oil pan and the filter. Refer to Automatic Transmission Fluid and Filter Replacement