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Hello guys,

I have 2008 trailblazer with 5.3 vortec engine. Its shaking at downshift while criusing down. If I keep it at 3 instead of drive then there is no shaking. So for now I drive at 3rd untill 60km/h and then move to drive if I want to go faster. This way I don't get any vibration. Had the mounts checked and they seem ok. Also once I am in drive, I can cruise to whatever speed up and no shaking. But if I release gas then it starts shaking while slowing down. I would really appreciate any help in this.

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