After replacing my abs computer, speedometer not working and truck not shifting right. What have they missed?

Thanks for your quick response. I feel bad for my mechanic. He has had it for 3 weeks and finially said any codes that do come up either don't make sense or go right away. He has been chasing wires and connections. Not sure what else he's done, but will find out. Appreciate the advise. CM

In your mechanics defense.. They can be very difficult sometimes for sure! .. Good luck with it..