Page 17-20-43
1989
17-20-43 Transmission, Automatic-AOD 17-20-43
REMOVAL AND INSTALLATION (continued)
To drain the torque converter:
1. Remove the lower converter access cover.
2. Rotate the torque converter until the drain plug comes into view.
3. Remove the drain plug and allow the transmission fluid to drain.
NOTE: It is recommended that this procedure be performed prior to other operations to allow sufficient time for the converter to drain properly.
4. Flush the cooler lines completely.
Fluid Cooler Lines
Tube Fittings When fluid leakage is found at the oil cooler, the cooler must be replaced. Refer to Group 27 for coolant replacement procedure. When one or more of the fluid cooler steel tubes must be replaced, each replacement tube must be fabricated from the same size steel tubing as the original line. Using the old tube as a guide, bend the new tube as required. Add the necessary fittings, and install the tube. After the fittings have been tightened to specification, add fluid as needed and check for fluid leaks.
Transmission
NOTE: If the transmission is being removed for a major overhaul, it is important to completely clean all transmission components, including converter, cooler, cooler lines, main control valve body, governor, all clutches, and all check balls after any transmission servicing that generates contamination. These contaminants are a major cause for recurring transmission troubles and must be removed from the system before the transmission is put back into service.
The cleaning of debris from the direct clutch check ball is often omitted. This omission can lead to a repeat servicing of the transmission.
Cleaning and flushing procedures for transmission components, including the direct clutch check ball, can be found in this Section listed under Cleaning and Inspection.
Removal
1. Raise vehicle on a hoist. Refer to Section 10-04.
2. Place the drain pan under the transmission fluid pan. Starting at the rear of the pan and working toward the front, loosen the attaching bolts and allow the fluid to drain. Finally remove all of the pan attaching bolts except two at the front, to allow the fluid to further drain. With fluid drained, install two bolts on the rear side of the pan to temporarily hold it in place.
3. Remove the converter drain plug access cover (from the lower end of the converter housing. 4. Remove the converter-to-flywheel attaching nuts. Place a wrench on the crankshaft pulley attaching bolt to turn the converter to gain access to the nuts.
5. Place a drain pan under the converter. With the wrench on the crankshaft pulley attaching bolt, turn the converter to gain access to the converter drain plug and remove the plug. After the fluid has been drained, install the plug.
6. Remove catalytic converter assembly.
7. Remove body reinforcement.
8. Remove exhaust pipe and muffler assembly.
9. To maintain driveshaft balance, mark the rear driveshaft yoke and the companion flange so the driveshaft can be installed in its original position.
10. Remove four boils retaining driveshaft to companion flange.