transmission whine

Good morning everyone, simply put I'm pretty well at a loss on this one. I have a 2007 GMC Sierra Classic SL Work Truck package with a 4.8L V8, automatic 2WD at roughly 116.5k miles. Here's my issue: From a cold stop, as accelerating, there's a higher pitched whining (more like a winding up...

Purchased 2015 Denali XL last May and had a rattle in the dash that the dealer could not fix after 8 trips lasting anywhere from 3 - 10 days per visit. I can tell you they tried almost everything possible to fix but just could not find the rattle. The good news is that the Denali was totaled in...