Suspension Noise problems of the 2015 Chevrolet Silverado 1500

Front suspension noise - during cold weather and when first driving within the first 1/2 mile, a loud noise comes from the front suspension after driving over a bump or speed bump. This only happened when very cold and within the first 1/2 mile. Brought the vehicle to the dealer at 35000 miles (koons Chevrolet, tysons corner, va) and under warranty they re-torqued the front frame cross member and lower control arms. I actually could not believe that Chevrolet and the dealer stated that was the problem. In all my years repairing cars, I have never heard of a "frame cross member" requiring re-torqueing especially on a new vehicle. If it was loose along with the lower control arms, that would indicate a serious problem. Problem was not resolved. 6 months later when cold again, brought the truck to the dealer and they now state that "the sway bar bushings required lubrication". Again, I have never heard of a rubber bushing requiring lubrication. Immediately after taking the truck from the dealer, I took pictures of the sway bar bushings sowing all the lubricant oozing out. I have addressed this issue with gm and they have been non-responsive. My concern is with all the vibrations that these trucks have reported, the life cycle of the front sway bar bushings will be reduced and could have a serious detrimental affect during a crash as the vehicle gets older. I was told there is no gm service bulletin on the issue. The dealer just wants the problem to go away and not see the truck again. Gm needs to address this issue properly from a technical point of view from their engineers.

The truck shakes at speeds of from 35 mph, then it stops and when driving on the highway at speeds between 60 and 70 on the thruway it shakes again. The vibration is transferred through the gas pedel and into the seats and console. Also when brakeing it shakes. Its been in for service several times for this since I bought it. Also the voltage meter drops and I lose dash board lights. This happens while the vehicle was in motion on both city and highway driving. I'm tired of loseing valuable days off to drive up to denooyer chevy in albany to have them look at this again. The truck travels straight and true but shakes at those speeds, sometime it makes a drowning sound as it happens. Its in the front end part of the suspension I believe. The tires were all high speed balanced and air is perfect in all 4 tires. Has anyone experienced this?.