It's all right to post an earlier thread if it is about an oncurring problem and isn't over 3 months old. The VSS (Vehicle Speed Sensor) isn't part of the throttle assembly and modules. It is part of the transmission. You may have to take the battery and tray out to get to it. It has an electrical connection going into it. There are several cables and hoses over the top of the area you want to work on. The wires from the oxygen sensor are clipped to the bracket of the VSS. Locate the oxygen sensor and trace its wires back to the bracket of the VSS in order to find it.
Since you used the first post to describe the problem you are having I'm assuming you have an automatic transmission. If not then the speed sensor wouldn't have anytning to do with the transmission slipping out of gear. Because the speed sensor isn't working the speedometer isn't working either. Because you have no speed registered on the speedometer, the transmission thinks you are stopped or going very slow and won't shift it out of first gear.
You need to replace the VSS, not to be confused with the TSS (Turbine Speed Sensor).
1. Raise and support the vehcle.
2. Disconnect the electrical connector
3. Unclip the heated oxygen sensor (HO2S) wire clip from the VSS bracket.
4. Remove the VSS bolt.
5. Gently pry out the VSS.
Judging from what you have already done you shouldn't have any problems. It's not a big job once you find it. It might be easier to go ahead and buy the part so you can identify what you are going to change. Dave