Quote Originally Posted by Fuj357racing View Post
Are there any Transmission Mod's available for the Denali, such as servo's, a bigger converter that's stock (like a suburban one) maybe? this vehicle has an extended warranty, so no huge aftermarket mod's. A nelson tune will prolly be added as well.
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