I've checked the tranny fluid and it'* nice and red, right up to the full mark.
In Normal shift mode it'* shifting from 1st to 2nd at around 55-5600 rpm (38-39 mph), and from 2-3 at the same rpm (80-81 mph).
In Performance shift mode (shifter in OD) I'm literally hitting the rev limiter in first gear (didn't know that was possible) with the RPM needle pointing damn near 6K (45-47 MPH).
2-3 shift is again close to 6K at 84-86 mph.

I do have to say, the shifts are FIRM!!! No blown lines now, but they have to be feeling the pressure.

Any idea why it'* shifting so late?

I was hitting the limiter in first before my tranny rebuild, not anymore. You just got your'* done, right?

Definitely shifting beyond 5600 RPM Don. I am really stumped, especially after having seen vids of Greenzilla'* shift points with the Stage 2 Jet.

Full rebuild with shift kit 8k back.

I smell tranny slip. And I sure hope you don't have the boost bypass trick in place. If the PCM doesn't dump boost before fuel cutoff......BOOM.

Reason I brought this up is because up until 3-4 weeks ago it shifted where it should... 1-2 in Perf shift @ 37-39 mph around 52-5300 rpm and 2-3 at 52-5300 (77-78 mph).

Now it'* shifting alot later. Today I know I saw damn close to 6k as I was trying out the freshly installed PEM'* (VERY smooth up there surprisingly). I know I've seen 46 mph in 1st with the shifter in OD. Haven't done a 2-3 shift at full throttle in a over a week, but last weekend on the freeway when I met up with Seth and Nate for core exhaust Manifolds I ran against a GTP Comp G a couple times and noticed 2-3 shifts close to 87-88 mph -almost 10 mph over before.

On my 1-2 shifts now the car does feel like it has hit fuel cut-off though. :?

Don't 'feel' any slip and the last time I had it scanned by the tranny shop (2 weeks ago) the didn't see any slip on the scanner. Have been getting these shift points since 2 scans back (the meet/mod day at Gordy'* almost a month ago).

Nope -no boost bypass trick -just loosened the 3 10mm bolts, pushed the valve down and retightened -no rerouting of the vacuum lines.

Every trans has slip when the TCC isn't locked up. We're not talking about overdrive here.

You are over-revving. Shifts are determined by many factors, including the VSS. The fact that your RPM'* are too high when the shift occurs tells me the trans is slipping, and the VSS is seeing the proper input.

This is the most logical answer at this point. If someone told you you didn't have any slip at WOT, they don't know how these things work. Your slip RPM count should be maxed at 255 (the digital age is upon us). How many rpm'* beyond that is impossible to read with a scantool.

Regardless, my money and odds are on you slipping at WOT.