Dropped mine at the GMC dealers.
They flushed the Transmission and the Torque converter.
Replaced fluid with Mobile 1 ATF Transmission fluid.
The shuttering went away and truck now drives perfect.
Today i purchased a beautiful 2016 GMC Sierra SLT 2 ALL TERAIN pickup.
After leaving dealership with it.
It began to have a VIBRATION with Acceleration.
Is there a permanent fix for this.
Torque converter shutter.