2>3 PT upshift engage-disengage-engage

[gman4dx266]

It happens on my 02 4L80E, using anything but a stock tune. I have put a completely different trans in the truck so I know it's not that. Edit something as small as the speed limiter or add a degree of spark advance somewhere and it happens.

It's hard to catch it on the log because it's so quick but I do have it on one (attached) @ frame 590. It's easier to see on the dash (with the rpm gauge) the rpms drop (2>3) go up, and then go back down. I am not sure if it is the tcc locking and then unlocking, but looking at the log it looks like it actually pulls the clutch pack apart, and re-applies it. I will post my current tune file and log on here. It's really weird, no matter where you set the shift points for 2>3. Other than that it runs great and it does not do it under full throttle. Even 256'ing out the whole 2>3 TCC row does nothing in case someone suggests that.

EDIT: It only does it in [D], and not 3rd *IF* I remember correctly.