Valve body and pressure switch (Chevrolet Tahoe 2)

Removal

1. Before you begin removing the valve body, make sure that it is really necessary.

2. Without removing the valve body, you can replace:

• torque converter clutch valve (1);
• pressure regulating valve (2);
• internal wiring harness (3);
• 2-3 gear shift valve (4);
• 1-2 gear shift valve (5);
• pressure regulator valve position sensor (6);
• 3-2 gear shift valve (7);
• torque converter clutch pulse width modulation valve (8).

3. Disconnect the internal connectors:

• pressure regulator valve position sensor (1);
• 1-2 gear shift valves (2);
• 2-3 gear shift valve (3);
• pressure regulating valves (4);
• clutch pulse width modulation valve (5);
• 3-2 gear shift valve (6).

4. (Modifications) Loosen the bolt (2) of the working fluid indicator limiter bracket.





5. Remove the working fluid indicator limiter bracket (1).

6. Using a small screwdriver, remove the retainer (2) of the torque converter clutch pulse width modulation valve (1). If necessary, turn the valve in its seat to gain access to the retainer.



7. Remove the torque converter clutch pulse width modulation valve (1).

8. Loosen the torque converter clutch locking valve mounting bolts.



9. Remove the torque converter clutch lock-up valve from the valve body (together with a sealing ring and a bundle of wires).





10. Place the wires aside.

11. Loosen the bolts securing the pressure switch to the valve body.



12. Remove the pressure switch.

13. Check the condition of the switch.



14. Loosen the manual lock spring mounting bolt.



15. Remove the retainer spring.



16. Check the condition of the retainer, look for cracks or damage.

Caution: When removing the valve body, keep it horizontal to prevent loss of the check valve balls located in the valve body holes.

17. Unscrew the remaining valve body mounting bolts.

18. Carefully lower the valve body while simultaneously disconnecting the manual valve rod.



19. Remove the 7 check valve balls.



20. Unscrew the bolts (58) and (59) of the battery cover (57).

21. Remove the cover (57).



22. Unscrew the bolts (77) of the spacer.



23. Remove the spacer (53).



24. Remove the valve body gasket (52), spacer (48), and crankcase gasket (47).

Installation

1. Install a NEW valve body gasket (52), spacer (48) and a NEW crankcase gasket (47).

2. Install the spacer (53) and the spacer mounting bolts (77). Tighten the bolts. Tightening torque 10 Nm.

3. Install the battery cover assembly (57).

4. Install bolts (58) and (59). Tighten the bolts. Tightening torque 10 Nm.

5. Place seven check valve balls into the valve body.

6. Carefully install the valve body while connecting the manual valve rod.

7. Make sure that the rod (3) of the manual valve is engaged with the valve (2) and the locking lever (1).



8. Install one bolt (M6x1 length 47.5 mm) into the central hole (1) of the valve body, tighten the bolt by hand.

Note: Since the valve body mounting bolts are different sizes, please be careful when installing them.

9. Install, but do not tighten, the valve body mounting bolts. The bolt locations are shown in the figure.

Note: (modifications) do not install the fluid level indicator limiter bracket and its mounting bolt yet.

10. Install the manual lock spring.

11. Install the manual lock spring mounting bolt.

12. Set the liquid pressure switch.

13. Tighten the switch mounting bolts by hand.

Note: The valve body mounting bolts are tightened in a "spiral" pattern starting from the center. Any other tightening pattern may result in incorrect valve operation.

14. Tighten the valve body mounting bolts in a spiral pattern. Tightening torque 11 N·m.



15. Make sure that the manual lock spring is correctly positioned on the lock lever. Tighten the mounting bolt. Tightening torque 11 N·m.

16. Install the TCC lockup valve with a NEW O-ring onto the valve body.

17. Install the locking valve mounting bolts and tighten the bolts. Tightening torque 11 Nm.

18. Install the inner wire bundle onto the valve body. The bundle casing has a protrusion (1). The orientation of the bundle is shown in the figure.



19. Place the casing projection between the valve body and the pressure switch at location (2). Press the casing of the wire bundle into the bosses (1) and (3) until it is fully secured.



20. Install the torque converter clutch pulse width modulation valve.

21. Install the modulation valve retainer.

22. (Modifications) Install the working fluid indicator limiter bracket. Tighten the mounting bolts. Tightening torque 11 N·m.

23. Connect all connectors:

• pressure regulator valve position sensor
• 1-2 gear shift valve
• 2-3 gear shift valve
• pressure regulating valves
• clutch pulse width modulation valve
• 3-2 gear shift valve.

24. Install the automatic transmission filter.

[The article was reprinted from the website CHEVYMAN]