Trans is not shifting out of 2nd at WOT. Is the trans shot or could it be solenoid or something small? Trans shifts fine during normal driving only WOT is affected.

 

Good Q...Id like 2 know as well...mines shifting but REALLY late...7400...

 

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i would like to know also mine is doing the same thing

 

It could be any number of things, but as for me, I would suspect the 3-4 clutch pack is letting go. Does it make the shift if you back off the throttle some?

 

mine shifts as soon as you come off the gas

 

It could be in the tune. Did you change anything as far as mods go. Also if you install a new tranny with PerformaBuilt you have to set everything at factory settings.
If the tranny just started it. Then your tranny could be going out.