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2014 Sierra 5.3 My truck developed a new shake/hard vibration. While in park I feel it a little, but when I shift to Reverse the shakes starts. Then when I shift to Neutral, it's stops. When in drive, the shakes starts again. Blower motor seems to be fine. While in Park, the motor and belts look normal. As well as under the truck, nothing seems to be moving. Engine mounts looks solid.

Experienced a one-off braking issue while descending a 7% grade. Had driven ~100 miles, stopping as needed with no issues. Began descending about 3 miles of maximum 7% grade touching the brakes infrequently as my 2018 Silverado 2500HD Duramax does a great job of reducing speed when off the petal. No towing selector, downshifting, no engine brake engaged. I’m just about to level ground, slowly apply my brakes and HELLO! Front-end/wheels start shaking like I’m about to throw a wheel. I feather braked to a stop on a side street, checked for play in the wheels and nothing evident. Continued another 120 miles, up hill/down hill, two 9% grades and only one instance of a very light wobble. Suggestions/similar situations?

I just purchased a new 2015 (8 miles) Silverado LT (4x4, 4.3L v6). During the test drive all seemed great with the truck so I purchased it. Driving it for the past 2 weeks has been great, love it! That was until 800miles or so I started to notice a slight vibration through the steering wheel and cabin. The issue is not consistent as it comes and goes so I started to do a little research and see this is a problem with past models. I noticed in other threads that people believe the issue to be a drive shaft, ball joints or out of balance parts. Dealers have replaced multiple parts but it seems to be ongoing issues for others. Clearly GM has not resolved this issue but here is the troubleshooting I did. I noticed my tire pressure was low 35psi. I kept changing the pressure to see what would happen with the vibration. Below are my results. To keep the vibration to a minimum, I increased the pressure on all wheels to 45-46 PSI and have found that it vibrates the least at this pressure. It's NOT completely gone but it's a start I guess. I will be contact the dealer tomorrow but wanted to know if anyone else has noticed the vibration with tire pressure changes. I assume tires are the problem. Any help on this would be greatly appreciated. 17inch wheels, Bridgestone Duler A/T P265/70R17 113S M+S Driver side front 35 Driver side rear 36 Passenger side front 37 Passenger side rear 37 Vibration between 58-63 Driver side front 41 Driver side rear 41 Passenger side front 41 Passenger side rear 41 Vibration between 63-68 Driver side front 45 Driver side rear 46 Passenger side front 45 Passenger side rear 45 Vibration (a lot less) 63-65 Driver side front 42 Driver side rear 46 Passenger side front 44 Passenger side rear 45 Vibration 65-70 Driver side front 44 Driver side rear 41 Passenger side front 44 Passenger side read 41 Vibration 63-68 Driver side front 43 Driver side rear 43 Passenger side front 43 Passenger side read 43 Vibration 64-66 Driver side front 43 Driver side rear 43 Passenger side front 43 Passenger side read 43 Vibration 64-66 - with out tonneau cover Driver side front 39 Driver side rear 39 Passenger side front 45 Passenger side read 45 Vibration 66-69 Driver side front 46 Driver side rear 45 Passenger side front 45 Passenger side read 45 Vibration (a lot less) 63-65