Transmission troubles
 

Ok guys I'm getting a p0755 code I can erase the code but it comes back as soon as the truck is started
the truck is a 2004 f250 5.4l gas with 256000 where should I start tracking the problem

That code indicates you have a stuck shift solenoid B. I'd start with shift solenoid B.

I'd start with checking the circuit for shift solenoid B.

The WSM defines the condition as:
SSB circuit failure.SSB circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during KOEO.