hi thank you for your question hope this helps.
the 2005 Toyota 4 runner does not have a dipstick like other automatic transmissions. to check the tranny fluid level you need to remove the refill plug on the side of the tranny. here are the steps to check the level.
FLUID LEVEL CHECK
The fluid temperature must be between 46C (115F) and56C (130F) to accurately check the fluid level.
BEFORE TRANSMISSION SERVICE
TRANSMISSION PAN FILL
Fill the transmission through the refill hole until fluid beginsto trickle out of the overflow tube.Reinstall the overflow plug.
If you cannot add the listed amount of fluid, do the following: