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2-3 shift is very harsh


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2-3 shift is very harsh

Howdy,  After many fruitless attemps to fix this one, I need a helping hand & some suggestions on solving this harsh 2-3 shift.  The current trans tune is pretty agressive in SPORT mode, trying to go for a Jekyl & Hyde approach and get NORMAL mode to shift smooth and silky go through the gear range for efficiency.


The 2-3 shift in NORMAL mode is harsh, with very slow & easy acceleration it's more pronounced.  It feels like it's locking up then slipping before the shift is completed.  The car will lose 2-3 MPH during this 2-3 shift as it jolts a bit, then engages to accelerate again.

In HP Tuners, NORMAL drive mode shows up as PATTERN B in the logs, SPORT mode shows up as PATTERN A.  The first 2 shifts are in NORMAL (PATTERN B) mode, the 3rd is in SPORT (PATTERN A), the last on in the log is in NORMAL mode and this last one before the log ends is really harsh.

Car is a 2011 CTS-V with a built 6L90E, PTC triple disc 3150 stall convertor, high effort 427 sleeved & stroked, ID 1300s. 1.9L blower w/ pullies set to kill with a 2.38" upper, anbd 9.06" lower.


Looking forward to hearing what needs to be changed to help fix this, thank you for your time!

Tune and log attached.


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