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Message: <blockquote data-quote="dennishoddy" data-source="post: 3235049" data-attributes="member: 5412">I've been told and totally believe you never do anything but pull the fluid from the auto tranny's and never drop the pan to clean anything. Toyota's are the only truck I'm aware of that has a drain plug. I drained mine once at about 200,000 miles and sold it at 365,000 miles. The Transmission is still working today with it's third owner that is a son of a family friend. Most transmissions now operate off the onboard computer using solenoid valves to move the spools internally.. Lucas tranny fluid fixed a transmission in a ford that I used to own. Its too hard to troubleshoot one while the other side is on the road.</blockquote>