2000 F250 4x4 152k

The transmission had been working great till a few days ago. No signs of slippage or failure. Less than 5k on fluid (I put a sonnax kit in a few weeks ago and flushed the tranny).

It will not shift into 3rd

I checked for codes and looked at the live data option on my predator. It looks like the pcm is not commanding the shift from 2nd to 3rd.

Has anyone got any ideas? I am gonna call BTS here afterawhile.

 

I think you answered your own question. Give Brian a call. That seems like the most common problem when the trans is going out. No shift 2nd to 3rd.

Good luck.