about 2 monthes ago, my trans been having this problem where when i take corners around 20mph, it will shift to 1st gear and rev to 4000 and wont stop until i either let go of the gas or it will go to 6000 and then will shift. i have an auto obviously. also it will shift late. what is it specifically?

 

my guess is fluid. try getting it flusshed... never hurts to do it anyway