dukedkt442 |
12-17-2018 12:52 PM |
FWIW, many trucks today (especially crew cabs) have chassis vibrations due to the harmonics of frames that are too stiff, and the slightest road irregularities resonate through the truck like a taught guitar string. I personally dealt with this over the last 2 years on a '14 Ram and a '17 Silverado Z-71. The Chevy's issues are so well-known that they actually have an allowable range of vibration frequencies, and after testing my truck, the dealer said that its vibrations were within the acceptable realm from GM. On the Ram, both the service department manager and the general manager drove the truck and couldn't feel the vibrations, but a lead tech drove it and noticed it within minutes, and told me it was inherent to the design (due to chassis stiffness and cavitation from the large, open cab of a crew cab), and sure enough, the next 4 trucks (of varying years, including a brand new '17 at the time) exhibited the same. Some folks are more sensitive to vibrations than others; some drove my trucks and couldn't feel a thing, others got slapped in the face with it. The dealer replaced the input shaft bearing on the rear diff which helped some, and also did a "special" tire remount and balance, "sidewall massaging" they called itt, where the tire's drive surface was essentially pulled in with a rope, forcing the sidewalls against the lip of the rim, as according to them, air pressure alone sometimes isn't enough to fully, 100% seat the the bead, and that ever so slight wave in the bead manifests itself in high-spots on the tire that finely-tuned keisters such as mine can notice. A lot of the issues with the GM trucks for vibrations that don't go away have been traced to improper lash between the gears in the rear diff right from the factory, upon tear-down.
I've also cured many vibrations and shaking wheels by installing new rotors, not sure if you replaced all 4. A warped rotor hangs up on the pads, and that causes a vibration that can be felt. On the fronts on my E46, the shaking steering wheel would actually go away when applying the brakes, contrary to many situations where getting on the brakes worsened the condition.
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