and no blown fuses

 

food for thought..... this truck sat for about 15 months. Any way the shift down system could be stuck in the shift down position?

 

Do you think that I should just up date the valve body to something that will perform better? I am this far into it now. Can I send mine out to up graded and where do I send it or should I just buy one already done?

 

have you tried a reset?
if yes the next step i would think is to just inspect the valve body for siezed accumulators and such that could be suspect.
im thinking its something electrical that caused it to go into limp mode

 

a dealer reset or just a battery reset?

 

actually try checking the (T16) Transmission Control Relay output circuit to see if your TCM relay is operating correctly. I was looking up random DTC diagnosis charts and they both had that in common.