Follow these instructions to keep the ATF cooler cleaner working properly:
Replace the two magnetic nonbypass spin-on filters after every 20 hours of use, based on the hour meter, or when you notice a restriction in the ATF flow.
Check the level and condition of the fluid in the tank before each use.
Replace the ATF in the tank when it looks dark or dirty.

Regulator Valve Body Disassembly, Inspection, and Reassembly (A/T)
Clean all parts thoroughly in solvent, and dry them with compressed air.
Blow out all passages except the air check valve filter.
Inspect the regulator valve body for scoring and ...
Torque Converter Housing Selector Control Shaft Oil Seal Replacement (A/T)
Special Tools Required
Driver Handle, 15 x 135L 07749-0010000
Oil Seal Driver Attachment 07947-ZV00100
Remove the oil seal from the torque converter housing.
Install the n ...
MTF Inspection and Replacement (M/T)
Park the vehicle on level ground, and turn the engine off.
Raise the vehicle on a lift, and make sure it is securely supported.
Remove the splash shield.
...