When the vehicle just barely starts to move in reverse, the speedo needle goes to 30mph. I stop. needle drops to 0. I put in drive and just barley move forward and the speedo needle moves immediately to 40mph. No matter how slow or fast, needle stays at 40, unless I stop, then it drops down to 0 again.
I replaced the Speed Sensor and even checked for resistance in the wires, nothing changed and resistance is good. I even thought that maybe the speedometer adaptor was put in using the wrong pinon gear reference point when A/T was rebuilt. I adjusted it, and this time, the needle did not move at all when driving, so I adjusted the adapter back to its original position. What next? Could it be something with the speedo gauge instead? Isnt there another sensor on the transmission farther forward?

Thank you

 

This vehicle also has ABS. Would there be an additional speed sensor on the left front hub?