I'm pretty sure it has the 6L85E, which I'm pretty sure nobody has tried to install a servo.
Once hptuners releases the trans calibration (shift firmness) you'll be able to make that trans shift as hard as you want to and have complete control.
A servo in an older 80E is too much in my opinion and hits too hard.
For the 6L85E, it's going to hit just as hard, I wouldn't install anything just yet.
Removing TM will allow that trans to hit harder. Being that the Denali is a "luxury" truck, they have tons of TM.
hope this helps,
allen




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