Speed sensor

Had no wires to the old one? Possibly its hanging down the back side of block or hanging on the firewall, Where they cut off?

I can't find where the wires were cut off from my speed senser what do I need to do

May have to fine same make & model from a yard like pull-a-part and go see where they came from and get the wire connectors with most of its wires so you can splice it back it and have enough to work with, some times this happens if parts were sold from the car, instead of disconnecting connectors they get cut or pulled out, so I am not saying this happened you may have them and just can not find them, look for any loose connectors or wires. Is this a new to your truck? Did it have a VSS when you replaced it and was not hooked up or how did this happen?