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I don't have a 2006 but I have experience with other model Toyotas. I suspect you fill it through the dipstick tube.
The 2006 Toyota Tundra has a 6-speed manual.
The 2006 Toyota RAV4 has a 4-speed automatic.
The 2006 Toyota Matrix has a 5-speed manual.
The 2006 Toyota Tacoma has a 5-speed manual.
The 2006 Toyota Highlander has a 5-speed automatic.
The 2006 Toyota 4Runner has a 5-speed automatic.
The 2006 Toyota Corolla has a 5-speed manual.
The 2006 Toyota Sequoia has a 5-speed automatic.
The 2006 Toyota Sienna has a 5-speed automatic.
The transmission oil level for your 2006 Toyota tundra with the transmission dipstick. The transmission dipstick will have a full indicator and a add fluid indicator stamped on the dipstick.
The 2006 Toyota Prius has a continuously variable-speed automatic.