Jetta problems

I have a jetta 1.8 t 2001. My auto 4-speed transmission sometimes slips nd goes into neutral between 2nd and third gear. I also have a problem with both the abs and traction control lights turning on when I start the car occasionally. To top it off, twice within the last week, I turned the car on and the engine sounded like an extremely powerful vacuum cleaner turned on. I was wondering whether all these problems are interelated through the speed sensors mounted on the transmission and what it is if not. Thank you.