4 or 5 speed automatic transmission 2013 trd sport

Quick question: How can I differentiate if my transmission is an automatic 4 speed or 5 speed? Is it based on the size of my motor? If that is the case I have a 4.0.

Let me know your thoughts.

 

2.7 gets a 4 spd auto or 5 spd stick.

4.0 gets a 5 spd auto or a six spd stick.

 

@Juggernaut has it right.

But you could count shifts too.

 

thanks that's good to know because i need to get trans fluid.