Need help after programming new ecm

[suined]

so I have been fighting with this truck since I made this post. Mechanic thought my engine fan issue was my ECM, ended up not being the issue after swapping the ecm.

before we swapped the ECM I followed the directions to backup ECM with calterm. saved the file, swapped ECMS. Everything on the truck works perfectly except the speedometer.

So it started out not reading at all and then the more I drove the better it got.. Above 60mph it would read accurate. So I take it to the shop and have the speed sensor on the transmission replaced and now the speedometer does not read at all. The shop pulled all the wiring from thr sensor to the ecm and inspected it for breaks, ohmed and load tested.. worked fine.

I am at a loss here. Only other thing i can think is to try a new speedometer? This truck is starting to give me a headache