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.

Online Reference Owner's Manual
This owner’s manual should be considered a permanent part of the
vehicle and should remain with the vehicle when it is sold.
This owner’s manual covers all models of your vehicle. You may find ...
Valve Stem-to-Guide Clearance Inspection
Remove the valves.
Subtract the O.D. of the valve stem, measured with a micrometer, from the
I.D. of the valve guide, measured with an inside micrometer or ball gauge.
Take t ...
Identification Numbers
Your vehicle has several identifying numbers in various places.
The vehicle identification number (VIN) is the 17-digit number your dealer uses
to register your vehicle for warranty purposes. It is ...