1989 Chevy Cavalier where is the speed sensor located does

I thank you for the reply knowing it is not the transmission. where is the speed sensor located in the engine . the person who looked at it told me it's located on the driver's side I read somewhere else it's located on the passanger's side. I looked up the part and it is the part i bought..
I may have someone else look at it to be sure about the part before I go ahead and do the test. It may be the part.

thank you again I only want to know the location.