We had to go through the tranny on our c7500 dump cat 3126 engine, fuller FS 6306A transmission we are not getting signal from the speed sensor, we tested the sensor with ohm meter and it checks out good, even bought a new one and tried it. Pulled the plug on the ecm and tested pin 32 and 33 which are the speed sensor wires, they are good. we are getting no power with load and this is a symptom of faulty or erratic speed sensor, also the spedo doesn't work now. I wonder if something was misplaced in the transmission, but the tranny shifts smooth up and down the pto works great. any ideas, I have given up and a local shop has the truck, they have spent two days on it and do not have it fixed. HELP!!!!!!!!!!!!