Hey guys, I need to install the correct Vehicle Speed Sensor on my car, I just talk to one autopart store and they told me that they have 3 different "sizes" of VSS.....the problem is that I think that the former car owner swapped out the tranny and I have no clue if it is the original one of the car, so, my question is, what if I buy the part the parts replacement paper say? it does not change anything at all, right? I am saying even when I put the correct gears in the tranny. I am confused, I do not know if buy the parts or just send it to a good mechanic to take a look at it first. Give me some clues guys!! thanks!!