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.

Brake Booster Replacement
Remove the air cleaner cover and the air cleaner case.
Remove the master cylinder.
Disconnect the brake booster vacuum hose (A) from the brake booster.
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Valve Body and ATF Strainer Removal (A/T)
Remove the ATF feed pipe (A) from the regulator valve body (B).
Remove the ATF feed pipes (C) (D) from the servo body (E).
Remove the ATF strainer (F) (two bolts).
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Clutch Disc and Pressure Plate Installation
Temporarily install the clutch disc onto the splines of the transmission
mainshaft. Make sure the clutch disc slides freely on the mainshaft.
Apply a light coat of super high temp ...