4R70W/4R75W Automatic Transmission
Main Control Valve BodySpecial Tool(s):
Removal
CAUTION: Do not pull on the molded lead frame. This may cause damage to the connector ends. Carefully pry up on the locking tabs to disconnect the solenoids. Disconnect the molded lead frame from the solenoids.
1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to Maintenance/Service and Repair.
2. Loosen, but do not remove the transmission fluid pan bolts and allow the fluid to drain. Once the fluid has drained, remove the bolts.
3. Remove the transmission fluid pan and gasket.
4. Pull down evenly and remove the transmission fluid filter and seal.
5. Clean and inspect the transmission fluid pan, gasket and magnet.
6. CAUTION: Do not pull on the molded lead frame. This may cause damage to the connector ends. Carefully pry up on the locking tabs to disconnect the solenoids. Disconnect the molded lead frame from the solenoids.
Disconnect the molded lead frame from the solenoids.
1 Disconnect the shift solenoid SSA and SSB.
2 Disconnect the torque converter clutch (TCC).
3 Disconnect the electronic pressure control (EPC) solenoid.
4 Disconnect the bulkhead interconnector.
7. Remove the manual control valve detent lever bolt and spring.
8. Remove the 23 valve body-to-case bolts and the EPC bracket bolt.
9. Remove the main control valve body and discard the pump outlet screen.
Installation
1. NOTE: Make sure that the drive pin of the manual valve detent lever assembly engages the manual valve in the correct location prior to installing the bolts.
Position the main control valve body gasket and main control valve body onto the transmission case using 2 bolts as a guide.
2. NOTE: The main control valve body bolts will be tightened in later steps.
Loosely install the 11 long main control valve body bolts.
3. NOTE: Lubricate the electronic pressure control (EPC) solenoid O-rings with clean automatic transmission fluid.
Position the EPC solenoid bracket and loosely install the bolt.
4. NOTE: The main control valve body bolts will be tightened in later steps.
Loosely install the main control valve body bolts.
5. Install the manual control valve detent lever spring and loosely install the bolt.
6. Tighten the main control valve body and cover plate bolts in the sequence shown.
^ Tighten to 10 Nm (89 inch lbs.)
7. Inspect the lead frame for damage.
^ Using the special tool, check all lead frame solenoid connections. The gauge should fit tightly and not fall out after being inserted.
^ If the special tool passes through any lead frame connector pins or does not feel like it makes a good contact, install a new lead frame.
8. Connect the molded lead frame to the solenoids.
^ Connect the bulkhead interconnector by pressing it in place by hand and fully seating the connector in place.
^ Connect the EPC solenoid by pressing it in place by hand and fully seating the connector in place. Make sure that the terminals pass fully through the connector slots.
^ Connect the TCC by pressing it in place by hand and fully seating the connector in place. Make sure that the terminals pass fully through the connector slots.
^ Connect the shift solenoid SSA and SSB by pressing it in place by hand and fully seating the connector in place. Make sure that the terminals pass fully through the connector slots.
9. NOTE: If the transmission is being repaired for a contamination related failure, use a new fluid filter and seal assembly. The fluid filter can be reused if no excessive contamination is present.
Install a new fluid filter and seal.
10. Position the pan magnet into the transmission fluid pan.
11. NOTE: The transmission fluid pan gasket is reusable. Clean and inspect for damage. If not damaged, the gasket should be reused.
Install the transmission fluid pan and gasket.
1 Position the transmission fluid pan gasket.
2 Position the transmission fluid pan.
12. Install the transmission fluid pan bolts.
^ Tighten to 14 Nm (10 ft. lbs.)
13. NOTE: Start by filling the transmission with 4.7L (5 qt) of clean automatic transmission fluid.
Fill the transmission to the correct level with clean automatic transmission fluid.