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Originally Posted by francisauto
If you are planing to keep the truck, I would do it at 30,000. I don't care what they say, the service is a lot cheaper than a new tranny.
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Here is a copy from "http://www.toyota-4runner.org/"
Toyota's responses to spark plug and transmission fluid questions
Thank you for contacting Toyota Motor Sales, U.S.A., Inc.
We appreciate the opportunity to address your inquiry.
The standard spark plugs in the 2004 4Runner V8 are 120K Iridium plugs. They will not need replacement until 120 thousand miles.
In the effort to minimize service required, the new transmissions do not require a fluid change, unless necessary with very heavy load conditions. There is a temperature sensor in the transmission that would alert the driver, if the load was super heating the transmission.
Otherwise, no maintenance required.