Thread: Possible Transmission Problem?

I have an Edge Evolution Programmer on my 2005 4.6L V8 F-150. The tune I have it set on firms up the shifts but it seems to be at the same shift rpm at WOT as stock. However, (and this has been occurring for months) it squeals when shifting from 1st to 2nd at WOT. It first started out as only when I was already rolling and then gunned it, it would squeal at the shift. Now it's anytime at WOT from first to second gear, rolling or from a stop. The sound sounds like a belt squeal almost (its a screeching/squealing noise at the shift, not a grinding noise though) and I fear it's the tranny slipping. Any ideas what it is and how bad it is and what damage I may have caused? If I adjusted the tune to lower the shift point do you think it would solve the issue? I have avoided gunning it for the past few months in hopes of not causing further damage. Thanks in advance!


And heres the pictures you asked for Alfie, if they help any. Its kind difficult because the coolant hose is right above the pulley for the alternator.