GM Has Yet To Fix GMC Sierra and Canyon Transmission Shudder

Two service bulletins have been issued by GM to try to address the shuddering issues in the Sierra and Canyon.
Aerospace and Mechanical Insider on MSN

Federal regulators investigate GM V8 failures after recall repairs in 997,743 vehicles

Federal regulators are examining reported failures of General Motors’ 6.2-liter V8 after some engines had already received ...
GM Authority

GM Still Dealing With Chevy Silverado And Colorado 8-Speed Transmission Shudder Complaints

GM has issued two new service bulletins in response to reported issues with the GM eight-speed automatic transmission in the Chevy Silverado and Chevy Colorado.
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The 6.2-liter V8 was GM's best truck engine, but now it's a liability

NHTSA opened Engineering Analysis EA26005 into 997,743 GM trucks and SUVs after 499 owners reported engine failures ...

6.6 Duramax Reliability: The Best and Worst Versions

GM's heavy-duty V8 Duramax turbodiesel is a powerful workhorse, but just how tough is it? We decided to find out.