How do you fill transmission fluid in 2007 tundra?

Remove the transmission dip stick at back of engine normally on left side of engine just in front of the firewall. Use the longer funnel, usually about 12" in length. You can also use 2 small funnels, one in the dip tube and another small funnel just above it. This allows you to pour into small funnel safely and it will pour into the lower small funnel they are lined up. I believe you have to have the engine running while you check the level of the fluid. DO NOT OVER FILL AS IT WILL CAUSE DAMAGE TO TRANS.