The picture posted by Quertz shows the VSS
location on the AX4N tranny. You can see the one bolt that holds it down. My experience in changing it involved a combination of tips I read on this board. My biggest challenge was getting it out of the tranny after the connector and bolt were removed. This is a tough repair because of the tight access and difficulty seeing what you are doing. The shop manual tells you to drop the y pipes. There are several ways to approach this. This is what i did on the AX4N with a DOHC
1. Remove the cowl and electrical connector on the fire wall to gain better access from the top.
2. From the top slide the rectangular heat shield up as high as you can with out damaging it.
3. From the top remove the connector. I have an electrical connector clip tool which helps make this a bit easier. A small flat blade screw driver can also help. It is retained by clips on opposite sides. Once it is removed stuff it up out of the way along with the heat shield.
4. Jack up the front passenger side and remove the wheel and wheel well shield.
5 From the wheel well, use a 6 pt. M10 deep socket and 3" extension to remove the one bolt holding it down. Feel around the motor mount and remove the one bolt. I would recommend a 1/4" drive or stubby 3/8" drive ratchet. This is done all by feel. It could be done from the top with similar tools. i.e. various extensions with a wobble or u-joint.. You don't need a deep socket but with the tools I had this was best for me.
6. The VSS
was in very tight and I could not get a good enough grip on it to twist it or pull up on it.
7. Alternating from both underneath the car and from the wheel well I used a long flat blade screw driver and a hammer and tapped it back and forth at its base. I did this until It moved enough so that I could pry under the exposed shoulder. This took some time, patience and finesse. I have to give some credit to the penetrating oil. Once it was loosened I was able to reach down from the top and remove it. At one point I considered removing the O2
sensor so I could get my hand in there better from the bottom but it proved to be unnecessary.
8. Installation is the reverse order. I placed a fine film of tranny fluid on the o-ring to help with the assembly.
Having one (or two) good drop lights are important so you can see. Even though most of what you do is by feel. Having small hands also helps.